diff --git a/src/main/java/com/google/api/generator/engine/ast/ClassDefinition.java b/src/main/java/com/google/api/generator/engine/ast/ClassDefinition.java index ec8f4f7b43..4e1211ba3a 100644 --- a/src/main/java/com/google/api/generator/engine/ast/ClassDefinition.java +++ b/src/main/java/com/google/api/generator/engine/ast/ClassDefinition.java @@ -14,6 +14,7 @@ package com.google.api.generator.engine.ast; +import com.google.api.generator.gapic.model.RegionTag; import com.google.auto.value.AutoValue; import com.google.common.base.Preconditions; import com.google.common.collect.ImmutableList; @@ -26,6 +27,9 @@ public abstract class ClassDefinition implements AstNode { // Optional. public abstract ImmutableList fileHeader(); + // Required for samples classes. + @Nullable + public abstract RegionTag regionTag(); // Required. public abstract ScopeNode scope(); // Required. @@ -92,6 +96,8 @@ public Builder setFileHeader(CommentStatement... headerComments) { public abstract Builder setFileHeader(List fileHeader); + public abstract Builder setRegionTag(RegionTag regionTag); + public Builder setHeaderCommentStatements(CommentStatement... comments) { return setHeaderCommentStatements(Arrays.asList(comments)); } diff --git a/src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java b/src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java index 85274e34b9..0967cea087 100644 --- a/src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java +++ b/src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java @@ -60,7 +60,6 @@ import com.google.api.generator.engine.ast.VaporReference; import com.google.api.generator.engine.ast.VariableExpr; import com.google.api.generator.engine.ast.WhileStatement; -import com.google.common.base.Preconditions; import com.google.common.base.Strings; import java.util.ArrayList; import java.util.Arrays; @@ -357,13 +356,7 @@ public void visit(TryCatchStatement tryCatchStatement) { if (tryCatchStatement.tryResourceExpr() != null) { tryCatchStatement.tryResourceExpr().accept(this); } - statements(tryCatchStatement.tryBody()); - - Preconditions.checkState( - !tryCatchStatement.isSampleCode() && !tryCatchStatement.catchVariableExprs().isEmpty(), - "Import generation should not be invoked on sample code, but was found when visiting a" - + " try-catch block"); for (int i = 0; i < tryCatchStatement.catchVariableExprs().size(); i++) { tryCatchStatement.catchVariableExprs().get(i).accept(this); statements(tryCatchStatement.catchBlocks().get(i)); diff --git a/src/main/java/com/google/api/generator/engine/writer/JavaWriterVisitor.java b/src/main/java/com/google/api/generator/engine/writer/JavaWriterVisitor.java index b1d750157e..d1ef68f34c 100644 --- a/src/main/java/com/google/api/generator/engine/writer/JavaWriterVisitor.java +++ b/src/main/java/com/google/api/generator/engine/writer/JavaWriterVisitor.java @@ -63,6 +63,7 @@ import com.google.api.generator.engine.ast.Variable; import com.google.api.generator.engine.ast.VariableExpr; import com.google.api.generator.engine.ast.WhileStatement; +import com.google.api.generator.gapic.model.RegionTag; import java.util.Arrays; import java.util.Iterator; import java.util.List; @@ -910,6 +911,15 @@ public void visit(ClassDefinition classDefinition) { newline(); } + String regionTagReplace = "REPLACE_REGION_TAG"; + if (classDefinition.regionTag() != null) { + statements( + Arrays.asList( + classDefinition + .regionTag() + .generateTag(RegionTag.RegionTagRegion.START, regionTagReplace))); + } + // This must go first, so that we can check for type collisions. classDefinition.accept(importWriterVisitor); if (!classDefinition.isNested()) { @@ -974,10 +984,27 @@ public void visit(ClassDefinition classDefinition) { classes(classDefinition.nestedClasses()); rightBrace(); + if (classDefinition.regionTag() != null) { + statements( + Arrays.asList( + classDefinition + .regionTag() + .generateTag(RegionTag.RegionTagRegion.END, regionTagReplace))); + } // We should have valid Java by now, so format it. if (!classDefinition.isNested()) { - buffer.replace(0, buffer.length(), JavaFormatter.format(buffer.toString())); + String formattedClazz = JavaFormatter.format(buffer.toString()); + + // fixing region tag after formatting + // formatter splits long region tags on multiple lines and moves the end tag up - doesn't meet + // tag requirements + if (classDefinition.regionTag() != null) { + formattedClazz = + formattedClazz.replaceAll(regionTagReplace, classDefinition.regionTag().generate()); + formattedClazz = formattedClazz.replaceAll("} // \\[END", "}\n// \\[END"); + } + buffer.replace(0, buffer.length(), formattedClazz); } } diff --git a/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java index 9fe1ff6eca..d268a60299 100644 --- a/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java +++ b/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java @@ -21,10 +21,12 @@ import com.google.api.generator.engine.ast.PackageInfoDefinition; import com.google.api.generator.engine.ast.TypeNode; import com.google.api.generator.engine.ast.VaporReference; -import com.google.api.generator.gapic.composer.samplecode.ServiceClientSampleCodeComposer; +import com.google.api.generator.gapic.composer.samplecode.SampleCodeWriter; +import com.google.api.generator.gapic.composer.samplecode.ServiceClientHeaderSampleComposer; import com.google.api.generator.gapic.composer.utils.ClassNames; import com.google.api.generator.gapic.model.GapicContext; import com.google.api.generator.gapic.model.GapicPackageInfo; +import com.google.api.generator.gapic.model.Sample; import com.google.api.generator.gapic.model.Service; import com.google.common.base.Preconditions; import com.google.common.base.Strings; @@ -119,10 +121,11 @@ private static CommentStatement createPackageInfoJavadoc(GapicContext context) { .setPakkage(service.pakkage()) .setName(ClassNames.getServiceClientClassName(service)) .build()); - String packageInfoSampleCode = - ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode( + Sample packageInfoSampleCode = + ServiceClientHeaderSampleComposer.composeClassHeaderSample( service, clientType, context.resourceNames(), context.messages()); - javaDocCommentBuilder.addSampleCode(packageInfoSampleCode); + javaDocCommentBuilder.addSampleCode( + SampleCodeWriter.writeInlineSample(packageInfoSampleCode.body())); } return CommentStatement.withComment(javaDocCommentBuilder.build()); diff --git a/src/main/java/com/google/api/generator/gapic/composer/comment/CommentComposer.java b/src/main/java/com/google/api/generator/gapic/composer/comment/CommentComposer.java index 4428170162..68ea3259be 100644 --- a/src/main/java/com/google/api/generator/gapic/composer/comment/CommentComposer.java +++ b/src/main/java/com/google/api/generator/gapic/composer/comment/CommentComposer.java @@ -17,6 +17,9 @@ import com.google.api.generator.engine.ast.BlockComment; import com.google.api.generator.engine.ast.CommentStatement; import com.google.api.generator.engine.ast.LineComment; +import com.google.api.generator.engine.ast.Statement; +import java.util.Arrays; +import java.util.List; public class CommentComposer { private static final String APACHE_LICENSE_STRING = @@ -52,4 +55,13 @@ public class CommentComposer { public static final CommentStatement AUTO_GENERATED_METHOD_COMMENT = CommentStatement.withComment( LineComment.withComment(AUTO_GENERATED_METHOD_DISCLAIMER_STRING)); + + public static final List AUTO_GENERATED_SAMPLE_COMMENT = + Arrays.asList( + CommentStatement.withComment( + LineComment.withComment( + "This snippet has been automatically generated for illustrative purposes only.")), + CommentStatement.withComment( + LineComment.withComment( + "It may require modifications to work in your environment."))); } diff --git a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientClassComposer.java index beb777f543..5be14c5f8e 100644 --- a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientClassComposer.java +++ b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientClassComposer.java @@ -55,7 +55,10 @@ import com.google.api.generator.engine.ast.Variable; import com.google.api.generator.engine.ast.VariableExpr; import com.google.api.generator.gapic.composer.comment.ServiceClientCommentComposer; -import com.google.api.generator.gapic.composer.samplecode.ServiceClientSampleCodeComposer; +import com.google.api.generator.gapic.composer.samplecode.SampleCodeWriter; +import com.google.api.generator.gapic.composer.samplecode.ServiceClientCallableMethodSampleComposer; +import com.google.api.generator.gapic.composer.samplecode.ServiceClientHeaderSampleComposer; +import com.google.api.generator.gapic.composer.samplecode.ServiceClientMethodSampleComposer; import com.google.api.generator.gapic.composer.store.TypeStore; import com.google.api.generator.gapic.composer.utils.ClassNames; import com.google.api.generator.gapic.composer.utils.PackageChecker; @@ -69,6 +72,7 @@ import com.google.api.generator.gapic.model.Method.Stream; import com.google.api.generator.gapic.model.MethodArgument; import com.google.api.generator.gapic.model.ResourceName; +import com.google.api.generator.gapic.model.Sample; import com.google.api.generator.gapic.model.Service; import com.google.api.generator.gapic.utils.JavaStyle; import com.google.api.generator.util.TriFunction; @@ -134,12 +138,13 @@ public GapicClass generate(GapicContext context, Service service) { String pakkage = service.pakkage(); boolean hasLroClient = service.hasStandardLroMethods(); + List samples = new ArrayList<>(); Map> grpcRpcsToJavaMethodNames = new HashMap<>(); ClassDefinition classDef = ClassDefinition.builder() .setHeaderCommentStatements( - createClassHeaderComments(service, typeStore, resourceNames, messageTypes)) + createClassHeaderComments(service, typeStore, resourceNames, messageTypes, samples)) .setPackageString(pakkage) .setAnnotations(createClassAnnotations(service, typeStore)) .setScope(ScopeNode.PUBLIC) @@ -153,12 +158,13 @@ public GapicClass generate(GapicContext context, Service service) { typeStore, resourceNames, hasLroClient, - grpcRpcsToJavaMethodNames)) + grpcRpcsToJavaMethodNames, + samples)) .setNestedClasses(createNestedPagingClasses(service, messageTypes, typeStore)) .build(); updateGapicMetadata(context, service, className, grpcRpcsToJavaMethodNames); - return GapicClass.create(kind, classDef); + return GapicClass.create(kind, classDef, samples); } private static List createClassAnnotations(Service service, TypeStore typeStore) { @@ -185,20 +191,23 @@ private static List createClassHeaderComments( Service service, TypeStore typeStore, Map resourceNames, - Map messageTypes) { + Map messageTypes, + List samples) { TypeNode clientType = typeStore.get(ClassNames.getServiceClientClassName(service)); TypeNode settingsType = typeStore.get(ClassNames.getServiceSettingsClassName(service)); - String classMethodSampleCode = - ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode( + Sample classMethodSampleCode = + ServiceClientHeaderSampleComposer.composeClassHeaderSample( service, clientType, resourceNames, messageTypes); - String credentialsSampleCode = - ServiceClientSampleCodeComposer.composeClassHeaderCredentialsSampleCode( - clientType, settingsType); - String endpointSampleCode = - ServiceClientSampleCodeComposer.composeClassHeaderEndpointSampleCode( - clientType, settingsType); + Sample credentialsSampleCode = + ServiceClientHeaderSampleComposer.composeSetCredentialsSample(clientType, settingsType); + Sample endpointSampleCode = + ServiceClientHeaderSampleComposer.composeSetEndpointSample(clientType, settingsType); + samples.addAll(Arrays.asList(classMethodSampleCode, credentialsSampleCode, endpointSampleCode)); return ServiceClientCommentComposer.createClassHeaderComments( - service, classMethodSampleCode, credentialsSampleCode, endpointSampleCode); + service, + SampleCodeWriter.writeInlineSample(classMethodSampleCode.body()), + SampleCodeWriter.writeInlineSample(credentialsSampleCode.body()), + SampleCodeWriter.writeInlineSample(endpointSampleCode.body())); } private List createClassMethods( @@ -207,14 +216,15 @@ private List createClassMethods( TypeStore typeStore, Map resourceNames, boolean hasLroClient, - Map> grpcRpcToJavaMethodMetadata) { + Map> grpcRpcToJavaMethodMetadata, + List samples) { List methods = new ArrayList<>(); methods.addAll(createStaticCreatorMethods(service, typeStore)); methods.addAll(createConstructorMethods(service, typeStore, hasLroClient)); methods.addAll(createGetterMethods(service, typeStore, hasLroClient)); methods.addAll( createServiceMethods( - service, messageTypes, typeStore, resourceNames, grpcRpcToJavaMethodMetadata)); + service, messageTypes, typeStore, resourceNames, grpcRpcToJavaMethodMetadata, samples)); methods.addAll(createBackgroundResourceMethods(service, typeStore)); return methods; } @@ -566,7 +576,8 @@ private static List createServiceMethods( Map messageTypes, TypeStore typeStore, Map resourceNames, - Map> grpcRpcToJavaMethodMetadata) { + Map> grpcRpcToJavaMethodMetadata, + List samples) { List javaMethods = new ArrayList<>(); Function javaMethodNameFn = m -> m.methodIdentifier().name(); for (Method method : service.methods()) { @@ -580,7 +591,8 @@ private static List createServiceMethods( ClassNames.getServiceClientClassName(service), messageTypes, typeStore, - resourceNames); + resourceNames, + samples); // Collect data for gapic_metadata.json. grpcRpcToJavaMethodMetadata @@ -597,7 +609,8 @@ private static List createServiceMethods( ClassNames.getServiceClientClassName(service), messageTypes, typeStore, - resourceNames); + resourceNames, + samples); // Collect data for gapic_metadata.json. grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod)); @@ -605,7 +618,8 @@ private static List createServiceMethods( } if (method.hasLro()) { MethodDefinition generatedMethod = - createLroCallableMethod(service, method, typeStore, messageTypes, resourceNames); + createLroCallableMethod( + service, method, typeStore, messageTypes, resourceNames, samples); // Collect data for gapic_metadata.json. grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod)); @@ -613,14 +627,15 @@ private static List createServiceMethods( } if (method.isPaged()) { MethodDefinition generatedMethod = - createPagedCallableMethod(service, method, typeStore, messageTypes, resourceNames); + createPagedCallableMethod( + service, method, typeStore, messageTypes, resourceNames, samples); // Collect data for gapic_metadata.json. grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod)); javaMethods.add(generatedMethod); } MethodDefinition generatedMethod = - createCallableMethod(service, method, typeStore, messageTypes, resourceNames); + createCallableMethod(service, method, typeStore, messageTypes, resourceNames, samples); // Collect data for the gapic_metadata.json file. grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod)); @@ -634,7 +649,8 @@ private static List createMethodVariants( String clientName, Map messageTypes, TypeStore typeStore, - Map resourceNames) { + Map resourceNames, + List samples) { List javaMethods = new ArrayList<>(); String methodName = JavaStyle.toLowerCamelCase(method.name()); TypeNode methodInputType = method.inputType(); @@ -695,15 +711,22 @@ private static List createMethodVariants( .setReturnType(methodOutputType) .build(); - Optional methodSampleCode = + Optional methodSample = Optional.of( - ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode( + ServiceClientHeaderSampleComposer.composeShowcaseMethodSample( method, typeStore.get(clientName), signature, resourceNames, messageTypes)); + Optional methodDocSample = Optional.empty(); + if (methodSample.isPresent()) { + samples.add(methodSample.get()); + methodDocSample = + Optional.of(SampleCodeWriter.writeInlineSample(methodSample.get().body())); + } + MethodDefinition.Builder methodVariantBuilder = MethodDefinition.builder() .setHeaderCommentStatements( ServiceClientCommentComposer.createRpcMethodHeaderComment( - method, signature, methodSampleCode)) + method, signature, methodDocSample)) .setScope(ScopeNode.PUBLIC) .setIsFinal(true) .setName(String.format(method.hasLro() ? "%sAsync" : "%s", methodName)) @@ -734,7 +757,8 @@ private static MethodDefinition createMethodDefaultMethod( String clientName, Map messageTypes, TypeStore typeStore, - Map resourceNames) { + Map resourceNames, + List samples) { String methodName = JavaStyle.toLowerCamelCase(method.name()); TypeNode methodInputType = method.inputType(); TypeNode methodOutputType = @@ -775,10 +799,16 @@ private static MethodDefinition createMethodDefaultMethod( callableMethodName = String.format(OPERATION_CALLABLE_NAME_PATTERN, methodName); } - Optional defaultMethodSampleCode = + Optional defaultMethodSample = Optional.of( - ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode( + ServiceClientMethodSampleComposer.composeCanonicalSample( method, typeStore.get(clientName), resourceNames, messageTypes)); + Optional defaultMethodDocSample = Optional.empty(); + if (defaultMethodSample.isPresent()) { + samples.add(defaultMethodSample.get()); + defaultMethodDocSample = + Optional.of(SampleCodeWriter.writeInlineSample(defaultMethodSample.get().body())); + } MethodInvocationExpr callableMethodExpr = MethodInvocationExpr.builder().setMethodName(callableMethodName).build(); @@ -793,7 +823,7 @@ private static MethodDefinition createMethodDefaultMethod( MethodDefinition.builder() .setHeaderCommentStatements( ServiceClientCommentComposer.createRpcMethodHeaderComment( - method, defaultMethodSampleCode)) + method, defaultMethodDocSample)) .setScope(ScopeNode.PUBLIC) .setIsFinal(true) .setName(String.format(method.hasLro() ? "%sAsync" : "%s", methodName)) @@ -823,9 +853,10 @@ private static MethodDefinition createLroCallableMethod( Method method, TypeStore typeStore, Map messageTypes, - Map resourceNames) { + Map resourceNames, + List samples) { return createCallableMethod( - service, method, CallableMethodKind.LRO, typeStore, messageTypes, resourceNames); + service, method, CallableMethodKind.LRO, typeStore, messageTypes, resourceNames, samples); } private static MethodDefinition createCallableMethod( @@ -833,9 +864,16 @@ private static MethodDefinition createCallableMethod( Method method, TypeStore typeStore, Map messageTypes, - Map resourceNames) { + Map resourceNames, + List samples) { return createCallableMethod( - service, method, CallableMethodKind.REGULAR, typeStore, messageTypes, resourceNames); + service, + method, + CallableMethodKind.REGULAR, + typeStore, + messageTypes, + resourceNames, + samples); } private static MethodDefinition createPagedCallableMethod( @@ -843,9 +881,10 @@ private static MethodDefinition createPagedCallableMethod( Method method, TypeStore typeStore, Map messageTypes, - Map resourceNames) { + Map resourceNames, + List samples) { return createCallableMethod( - service, method, CallableMethodKind.PAGED, typeStore, messageTypes, resourceNames); + service, method, CallableMethodKind.PAGED, typeStore, messageTypes, resourceNames, samples); } private static MethodDefinition createCallableMethod( @@ -854,7 +893,8 @@ private static MethodDefinition createCallableMethod( CallableMethodKind callableMethodKind, TypeStore typeStore, Map messageTypes, - Map resourceNames) { + Map resourceNames, + List samples) { TypeNode rawCallableReturnType = null; if (callableMethodKind.equals(CallableMethodKind.LRO)) { rawCallableReturnType = typeStore.get("OperationCallable"); @@ -896,42 +936,47 @@ private static MethodDefinition createCallableMethod( .setReturnType(returnType) .build(); - Optional sampleCodeOpt = Optional.empty(); + Optional sampleCode = Optional.empty(); if (callableMethodKind.equals(CallableMethodKind.LRO)) { - sampleCodeOpt = + sampleCode = Optional.of( - ServiceClientSampleCodeComposer.composeLroCallableMethodHeaderSampleCode( + ServiceClientCallableMethodSampleComposer.composeLroCallableMethod( method, typeStore.get(ClassNames.getServiceClientClassName(service)), resourceNames, messageTypes)); } else if (callableMethodKind.equals(CallableMethodKind.PAGED)) { - sampleCodeOpt = + sampleCode = Optional.of( - ServiceClientSampleCodeComposer.composePagedCallableMethodHeaderSampleCode( + ServiceClientCallableMethodSampleComposer.composePagedCallableMethod( method, typeStore.get(ClassNames.getServiceClientClassName(service)), resourceNames, messageTypes)); } else if (callableMethodKind.equals(CallableMethodKind.REGULAR)) { if (method.stream().equals(Stream.NONE)) { - sampleCodeOpt = + sampleCode = Optional.of( - ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode( + ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod( method, typeStore.get(ClassNames.getServiceClientClassName(service)), resourceNames, messageTypes)); } else { - sampleCodeOpt = + sampleCode = Optional.of( - ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode( + ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod( method, typeStore.get(ClassNames.getServiceClientClassName(service)), resourceNames, messageTypes)); } } + Optional sampleDocCode = Optional.empty(); + if (sampleCode.isPresent()) { + samples.add(sampleCode.get()); + sampleDocCode = Optional.of(SampleCodeWriter.writeInlineSample(sampleCode.get().body())); + } MethodDefinition.Builder methodDefBuilder = MethodDefinition.builder(); if (method.isDeprecated()) { @@ -943,7 +988,7 @@ private static MethodDefinition createCallableMethod( return methodDefBuilder .setHeaderCommentStatements( ServiceClientCommentComposer.createRpcCallableMethodHeaderComment( - method, sampleCodeOpt)) + method, sampleDocCode)) .setScope(ScopeNode.PUBLIC) .setIsFinal(true) .setName(methodName) diff --git a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceSettingsClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceSettingsClassComposer.java index ccf15a1d64..f5e34f9397 100644 --- a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceSettingsClassComposer.java +++ b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceSettingsClassComposer.java @@ -50,7 +50,8 @@ import com.google.api.generator.engine.ast.Variable; import com.google.api.generator.engine.ast.VariableExpr; import com.google.api.generator.gapic.composer.comment.SettingsCommentComposer; -import com.google.api.generator.gapic.composer.samplecode.SettingsSampleCodeComposer; +import com.google.api.generator.gapic.composer.samplecode.SampleCodeWriter; +import com.google.api.generator.gapic.composer.samplecode.SettingsSampleComposer; import com.google.api.generator.gapic.composer.store.TypeStore; import com.google.api.generator.gapic.composer.utils.ClassNames; import com.google.api.generator.gapic.composer.utils.PackageChecker; @@ -59,6 +60,7 @@ import com.google.api.generator.gapic.model.GapicContext; import com.google.api.generator.gapic.model.Method; import com.google.api.generator.gapic.model.Method.Stream; +import com.google.api.generator.gapic.model.Sample; import com.google.api.generator.gapic.model.Service; import com.google.api.generator.gapic.utils.JavaStyle; import com.google.common.base.Preconditions; @@ -100,12 +102,13 @@ public GapicClass generate(GapicContext context, Service service) { TypeStore typeStore = createDynamicTypes(service); String className = ClassNames.getServiceSettingsClassName(service); GapicClass.Kind kind = Kind.MAIN; - + List samples = new ArrayList<>(); + List classHeaderComments = + createClassHeaderComments(service, typeStore.get(className), samples); ClassDefinition classDef = ClassDefinition.builder() .setPackageString(pakkage) - .setHeaderCommentStatements( - createClassHeaderComments(service, typeStore.get(className))) + .setHeaderCommentStatements(classHeaderComments) .setAnnotations(createClassAnnotations(service)) .setScope(ScopeNode.PUBLIC) .setName(className) @@ -122,11 +125,11 @@ public GapicClass generate(GapicContext context, Service service) { .setMethods(createClassMethods(service, typeStore)) .setNestedClasses(Arrays.asList(createNestedBuilderClass(service, typeStore))) .build(); - return GapicClass.create(kind, classDef); + return GapicClass.create(kind, classDef, samples); } private static List createClassHeaderComments( - Service service, TypeNode classType) { + Service service, TypeNode classType, List samples) { // Pick the first pure unary rpc method, if no such method exists, then pick the first in the // list. Optional methodOpt = @@ -139,15 +142,22 @@ private static List createClassHeaderComments( .orElse(service.methods().get(0))); Optional methodNameOpt = methodOpt.isPresent() ? Optional.of(methodOpt.get().name()) : Optional.empty(); - Optional sampleCodeOpt = - SettingsSampleCodeComposer.composeSampleCode( + Optional sampleCode = + SettingsSampleComposer.composeSettingsSample( methodNameOpt, ClassNames.getServiceSettingsClassName(service), classType); + + Optional docSampleCode = Optional.empty(); + if (sampleCode.isPresent()) { + samples.add(sampleCode.get()); + docSampleCode = Optional.of(SampleCodeWriter.writeInlineSample(sampleCode.get().body())); + } + return SettingsCommentComposer.createClassHeaderComments( ClassNames.getServiceClientClassName(service), service.defaultHost(), service.isDeprecated(), methodNameOpt, - sampleCodeOpt, + docSampleCode, classType); } diff --git a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java index 0ba5da2e49..82d8fd0e9e 100644 --- a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java +++ b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java @@ -79,7 +79,8 @@ import com.google.api.generator.engine.ast.Variable; import com.google.api.generator.engine.ast.VariableExpr; import com.google.api.generator.gapic.composer.comment.SettingsCommentComposer; -import com.google.api.generator.gapic.composer.samplecode.SettingsSampleCodeComposer; +import com.google.api.generator.gapic.composer.samplecode.SampleCodeWriter; +import com.google.api.generator.gapic.composer.samplecode.SettingsSampleComposer; import com.google.api.generator.gapic.composer.store.TypeStore; import com.google.api.generator.gapic.composer.utils.ClassNames; import com.google.api.generator.gapic.composer.utils.PackageChecker; @@ -91,6 +92,7 @@ import com.google.api.generator.gapic.model.Message; import com.google.api.generator.gapic.model.Method; import com.google.api.generator.gapic.model.Method.Stream; +import com.google.api.generator.gapic.model.Sample; import com.google.api.generator.gapic.model.Service; import com.google.api.generator.gapic.utils.JavaStyle; import com.google.common.base.Preconditions; @@ -168,6 +170,7 @@ public GapicClass generate(GapicContext context, Service service) { String pakkage = String.format("%s.stub", service.pakkage()); TypeStore typeStore = createDynamicTypes(service, pakkage); + List samples = new ArrayList<>(); Set deprecatedSettingVarNames = new HashSet<>(); Map methodSettingsMemberVarExprs = createMethodSettingsClassMemberVarExprs( @@ -177,12 +180,12 @@ public GapicClass generate(GapicContext context, Service service) { /* isNestedClass= */ false, deprecatedSettingVarNames); String className = ClassNames.getServiceStubSettingsClassName(service); - + List classHeaderComments = + createClassHeaderComments(service, typeStore.get(className), samples); ClassDefinition classDef = ClassDefinition.builder() .setPackageString(pakkage) - .setHeaderCommentStatements( - createClassHeaderComments(service, typeStore.get(className))) + .setHeaderCommentStatements(classHeaderComments) .setAnnotations(createClassAnnotations(service)) .setScope(ScopeNode.PUBLIC) .setName(className) @@ -196,7 +199,7 @@ public GapicClass generate(GapicContext context, Service service) { .setNestedClasses( Arrays.asList(createNestedBuilderClass(service, serviceConfig, typeStore))) .build(); - return GapicClass.create(GapicClass.Kind.STUB, classDef); + return GapicClass.create(GapicClass.Kind.STUB, classDef, samples); } protected MethodDefinition createDefaultCredentialsProviderBuilderMethod() { @@ -376,7 +379,7 @@ private List createClassAnnotations(Service service) { } private static List createClassHeaderComments( - Service service, TypeNode classType) { + Service service, TypeNode classType, List samples) { // Pick the first pure unary rpc method, if no such method exists, then pick the first in the // list. Optional methodOpt = @@ -389,16 +392,22 @@ private static List createClassHeaderComments( .orElse(service.methods().get(0))); Optional methodNameOpt = methodOpt.isPresent() ? Optional.of(methodOpt.get().name()) : Optional.empty(); - Optional sampleCodeOpt = - SettingsSampleCodeComposer.composeSampleCode( + Optional sampleCode = + SettingsSampleComposer.composeSettingsSample( methodNameOpt, ClassNames.getServiceSettingsClassName(service), classType); + Optional docSampleCode = Optional.empty(); + if (sampleCode.isPresent()) { + samples.add(sampleCode.get()); + docSampleCode = Optional.of(SampleCodeWriter.writeInlineSample(sampleCode.get().body())); + } + return SettingsCommentComposer.createClassHeaderComments( ClassNames.getServiceStubClassName(service), service.defaultHost(), service.isDeprecated(), methodNameOpt, - sampleCodeOpt, + docSampleCode, classType); } diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeJavaFormatter.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleBodyJavaFormatter.java similarity index 95% rename from src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeJavaFormatter.java rename to src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleBodyJavaFormatter.java index fe8f0005c7..826c041f32 100644 --- a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeJavaFormatter.java +++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleBodyJavaFormatter.java @@ -18,13 +18,13 @@ import com.google.googlejavaformat.java.Formatter; import com.google.googlejavaformat.java.FormatterException; -public final class SampleCodeJavaFormatter { +public final class SampleBodyJavaFormatter { - private SampleCodeJavaFormatter() {} + private SampleBodyJavaFormatter() {} private static final Formatter FORMATTER = new Formatter(); - private static final String FAKE_CLASS_TITLE = "public class FakeClass { void fakeMethod() {"; + private static final String FAKE_CLASS_TITLE = "public class FakeClass { void fakeMethod() {\n"; private static final String FAKE_CLASS_CLOSE = "}}"; /** diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java index 07abeb9a17..6e78f88d0b 100644 --- a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java +++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java @@ -14,24 +14,44 @@ package com.google.api.generator.gapic.composer.samplecode; +import com.google.api.generator.engine.ast.ClassDefinition; import com.google.api.generator.engine.ast.Statement; import com.google.api.generator.engine.writer.JavaWriterVisitor; +import com.google.api.generator.gapic.model.Sample; +import com.google.common.annotations.VisibleForTesting; import java.util.Arrays; import java.util.List; public final class SampleCodeWriter { + public static String writeInlineSample(List statements) { + return write(SampleComposer.composeInlineSample(statements)); + } + + public static String writeExecutableSample(Sample sample, String packkage) { + return write(SampleComposer.composeExecutableSample(sample, packkage)); + } + + @VisibleForTesting public static String write(Statement... statement) { return write(Arrays.asList(statement)); } + @VisibleForTesting public static String write(List statements) { JavaWriterVisitor visitor = new JavaWriterVisitor(); for (Statement statement : statements) { statement.accept(visitor); } - String formattedSampleCode = SampleCodeJavaFormatter.format(visitor.write()); + String formattedSampleCode = SampleBodyJavaFormatter.format(visitor.write()); // Escape character "@" in the markdown code block 
{@code...} tags.
     return formattedSampleCode.replaceAll("@", "{@literal @}");
   }
+
+  @VisibleForTesting
+  public static String write(ClassDefinition classDefinition) {
+    JavaWriterVisitor visitor = new JavaWriterVisitor();
+    classDefinition.accept(visitor);
+    return visitor.write();
+  }
 }
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleComposer.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleComposer.java
new file mode 100644
index 0000000000..86eb187fd1
--- /dev/null
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleComposer.java
@@ -0,0 +1,163 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import com.google.api.generator.engine.ast.AssignmentExpr;
+import com.google.api.generator.engine.ast.ClassDefinition;
+import com.google.api.generator.engine.ast.CommentStatement;
+import com.google.api.generator.engine.ast.Expr;
+import com.google.api.generator.engine.ast.ExprStatement;
+import com.google.api.generator.engine.ast.MethodDefinition;
+import com.google.api.generator.engine.ast.MethodInvocationExpr;
+import com.google.api.generator.engine.ast.ScopeNode;
+import com.google.api.generator.engine.ast.Statement;
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.Variable;
+import com.google.api.generator.engine.ast.VariableExpr;
+import com.google.api.generator.gapic.composer.comment.CommentComposer;
+import com.google.api.generator.gapic.model.RegionTag;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.gapic.utils.JavaStyle;
+import com.google.common.collect.ImmutableList;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class SampleComposer {
+  static List composeInlineSample(List sampleBody) {
+    return bodyWithComment(CommentComposer.AUTO_GENERATED_SAMPLE_COMMENT, sampleBody);
+  }
+
+  //  "Executable" meaning it includes the necessary code to execute java code,
+  //  still may require additional configuration to actually execute generated sample code
+  static ClassDefinition composeExecutableSample(Sample sample, String pakkage) {
+    return createExecutableSample(
+        sample.fileHeader(),
+        pakkage,
+        sample.name(),
+        sample.variableAssignments(),
+        bodyWithComment(CommentComposer.AUTO_GENERATED_SAMPLE_COMMENT, sample.body()),
+        sample.regionTag());
+  }
+
+  private static List bodyWithComment(
+      List autoGeneratedComment, List sampleBody) {
+    List bodyWithComment = new ArrayList<>(autoGeneratedComment);
+    bodyWithComment.addAll(sampleBody);
+    return bodyWithComment;
+  }
+
+  private static ClassDefinition createExecutableSample(
+      List fileHeader,
+      String packageName,
+      String sampleClassName,
+      List sampleVariableAssignments,
+      List sampleBody,
+      RegionTag regionTag) {
+
+    String sampleMethodName = JavaStyle.toLowerCamelCase(sampleClassName);
+    List sampleMethodArgs = composeSampleMethodArgs(sampleVariableAssignments);
+    MethodDefinition mainMethod =
+        composeMainMethod(
+            composeMainBody(
+                sampleVariableAssignments,
+                composeInvokeMethodStatement(sampleMethodName, sampleMethodArgs)));
+    MethodDefinition sampleMethod =
+        composeSampleMethod(sampleMethodName, sampleMethodArgs, sampleBody);
+    return composeSampleClass(
+        fileHeader, packageName, sampleClassName, mainMethod, sampleMethod, regionTag);
+  }
+
+  private static List composeSampleMethodArgs(
+      List sampleVariableAssignments) {
+    return sampleVariableAssignments.stream()
+        .map(v -> v.variableExpr().toBuilder().setIsDecl(true).build())
+        .collect(Collectors.toList());
+  }
+
+  private static Statement composeInvokeMethodStatement(
+      String sampleMethodName, List sampleMethodArgs) {
+    List invokeArgs =
+        sampleMethodArgs.stream()
+            .map(arg -> arg.toBuilder().setIsDecl(false).build())
+            .collect(Collectors.toList());
+    return ExprStatement.withExpr(
+        MethodInvocationExpr.builder()
+            .setMethodName(sampleMethodName)
+            .setArguments(invokeArgs)
+            .build());
+  }
+
+  private static List composeMainBody(
+      List sampleVariableAssignments, Statement invokeMethod) {
+    List setVariables =
+        sampleVariableAssignments.stream()
+            .map(var -> ExprStatement.withExpr(var))
+            .collect(Collectors.toList());
+    List body = new ArrayList<>(setVariables);
+    body.add(invokeMethod);
+    return body;
+  }
+
+  private static ClassDefinition composeSampleClass(
+      List fileHeader,
+      String packageName,
+      String sampleClassName,
+      MethodDefinition mainMethod,
+      MethodDefinition sampleMethod,
+      RegionTag regionTag) {
+    return ClassDefinition.builder()
+        .setFileHeader(fileHeader)
+        .setRegionTag(regionTag)
+        .setScope(ScopeNode.PUBLIC)
+        .setPackageString(packageName)
+        .setName(sampleClassName)
+        .setMethods(ImmutableList.of(mainMethod, sampleMethod))
+        .build();
+  }
+
+  private static MethodDefinition composeMainMethod(List mainBody) {
+    return MethodDefinition.builder()
+        .setScope(ScopeNode.PUBLIC)
+        .setIsStatic(true)
+        .setReturnType(TypeNode.VOID)
+        .setName("main")
+        .setArguments(
+            VariableExpr.builder()
+                .setVariable(
+                    Variable.builder().setType(TypeNode.STRING_ARRAY).setName("args").build())
+                .setIsDecl(true)
+                .build())
+        .setThrowsExceptions(Arrays.asList(TypeNode.withExceptionClazz(Exception.class)))
+        .setBody(mainBody)
+        .build();
+  }
+
+  private static MethodDefinition composeSampleMethod(
+      String sampleMethodName,
+      List sampleMethodArgs,
+      List sampleMethodBody) {
+    return MethodDefinition.builder()
+        .setScope(ScopeNode.PUBLIC)
+        .setIsStatic(true)
+        .setReturnType(TypeNode.VOID)
+        .setName(sampleMethodName)
+        .setArguments(sampleMethodArgs)
+        .setThrowsExceptions(Arrays.asList(TypeNode.withExceptionClazz(Exception.class)))
+        .setBody(sampleMethodBody)
+        .build();
+  }
+}
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleComposerUtil.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleComposerUtil.java
new file mode 100644
index 0000000000..93d8d4993f
--- /dev/null
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleComposerUtil.java
@@ -0,0 +1,65 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import com.google.api.generator.engine.ast.AssignmentExpr;
+import com.google.api.generator.engine.ast.MethodInvocationExpr;
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.VariableExpr;
+import com.google.api.generator.gapic.model.MethodArgument;
+import com.google.api.generator.gapic.model.ResourceName;
+import com.google.api.generator.gapic.utils.JavaStyle;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class SampleComposerUtil {
+  // Assign client variable expr with create client.
+  // e.g EchoClient echoClient = EchoClient.create()
+  static AssignmentExpr assignClientVariableWithCreateMethodExpr(VariableExpr clientVarExpr) {
+    return AssignmentExpr.builder()
+        .setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build())
+        .setValueExpr(
+            MethodInvocationExpr.builder()
+                .setStaticReferenceType(clientVarExpr.variable().type())
+                .setReturnType(clientVarExpr.variable().type())
+                .setMethodName("create")
+                .build())
+        .build();
+  }
+
+  static boolean isStringTypedResourceName(
+      MethodArgument arg, Map resourceNames) {
+    return arg.type().equals(TypeNode.STRING)
+        && arg.field().hasResourceReference()
+        && resourceNames.containsKey(arg.field().resourceReference().resourceTypeString());
+  }
+
+  static boolean isProtoEmptyType(TypeNode type) {
+    return type.reference().pakkage().equals("com.google.protobuf")
+        && type.reference().name().equals("Empty");
+  }
+
+  static String createOverloadDisambiguation(List methodArgVarExprs) {
+    return methodArgVarExprs.stream()
+        .map(
+            arg ->
+                JavaStyle.toUpperCamelCase(
+                    arg.variable().type().reference() == null
+                        ? arg.variable().type().typeKind().name().toLowerCase()
+                        : arg.variable().type().reference().name().toLowerCase()))
+        .collect(Collectors.joining());
+  }
+}
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposer.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientCallableMethodSampleComposer.java
similarity index 59%
rename from src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposer.java
rename to src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientCallableMethodSampleComposer.java
index 5ca7b573af..725a1900b6 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientCallableMethodSampleComposer.java
@@ -1,4 +1,4 @@
-// Copyright 2020 Google LLC
+// Copyright 2022 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,6 @@
 package com.google.api.generator.gapic.composer.samplecode;
 
 import com.google.api.core.ApiFuture;
-import com.google.api.gax.core.FixedCredentialsProvider;
 import com.google.api.gax.longrunning.OperationFuture;
 import com.google.api.gax.rpc.ApiStreamObserver;
 import com.google.api.gax.rpc.BidiStream;
@@ -39,7 +38,6 @@
 import com.google.api.generator.engine.ast.TypeNode;
 import com.google.api.generator.engine.ast.UnaryOperationExpr;
 import com.google.api.generator.engine.ast.ValueExpr;
-import com.google.api.generator.engine.ast.VaporReference;
 import com.google.api.generator.engine.ast.Variable;
 import com.google.api.generator.engine.ast.VariableExpr;
 import com.google.api.generator.engine.ast.WhileStatement;
@@ -47,292 +45,22 @@
 import com.google.api.generator.gapic.model.Field;
 import com.google.api.generator.gapic.model.Message;
 import com.google.api.generator.gapic.model.Method;
-import com.google.api.generator.gapic.model.Method.Stream;
-import com.google.api.generator.gapic.model.MethodArgument;
+import com.google.api.generator.gapic.model.RegionTag;
 import com.google.api.generator.gapic.model.ResourceName;
-import com.google.api.generator.gapic.model.Service;
+import com.google.api.generator.gapic.model.Sample;
 import com.google.api.generator.gapic.utils.JavaStyle;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
 import com.google.longrunning.Operation;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;
-import java.util.function.Function;
 import java.util.stream.Collectors;
-import java.util.stream.IntStream;
-
-public class ServiceClientSampleCodeComposer {
-
-  public static String composeClassHeaderMethodSampleCode(
-      Service service,
-      TypeNode clientType,
-      Map resourceNames,
-      Map messageTypes) {
-    // Use the first pure unary RPC method's sample code as showcase, if no such method exists, use
-    // the first method in the service's methods list.
-    Method method =
-        service.methods().stream()
-            .filter(m -> m.stream() == Stream.NONE && !m.hasLro() && !m.isPaged())
-            .findFirst()
-            .orElse(service.methods().get(0));
-    if (method.stream() == Stream.NONE) {
-      if (method.methodSignatures().isEmpty()) {
-        return composeRpcDefaultMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-      }
-      return composeRpcMethodHeaderSampleCode(
-          method, clientType, method.methodSignatures().get(0), resourceNames, messageTypes);
-    }
-    return composeStreamCallableMethodHeaderSampleCode(
-        method, clientType, resourceNames, messageTypes);
-  }
-
-  public static String composeClassHeaderCredentialsSampleCode(
-      TypeNode clientType, TypeNode settingsType) {
-    // Initialize clientSettings with builder() method.
-    // e.g. EchoSettings echoSettings =
-    // EchoSettings.newBuilder().setCredentialsProvider(FixedCredentialsProvider.create("myCredentials")).build();
-    String settingsName = JavaStyle.toLowerCamelCase(settingsType.reference().name());
-    String clientName = JavaStyle.toLowerCamelCase(clientType.reference().name());
-    TypeNode myCredentialsType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("myCredentials")
-                .setPakkage(clientType.reference().pakkage())
-                .build());
-    VariableExpr settingsVarExpr =
-        VariableExpr.withVariable(
-            Variable.builder().setName(settingsName).setType(settingsType).build());
-    MethodInvocationExpr newBuilderMethodExpr =
-        MethodInvocationExpr.builder()
-            .setStaticReferenceType(settingsType)
-            .setMethodName("newBuilder")
-            .build();
-    TypeNode fixedCredentialProvideType =
-        TypeNode.withReference(ConcreteReference.withClazz(FixedCredentialsProvider.class));
-    MethodInvocationExpr credentialArgExpr =
-        MethodInvocationExpr.builder()
-            .setStaticReferenceType(fixedCredentialProvideType)
-            .setArguments(
-                VariableExpr.withVariable(
-                    Variable.builder().setName("myCredentials").setType(myCredentialsType).build()))
-            .setMethodName("create")
-            .build();
-    MethodInvocationExpr credentialsMethodExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(newBuilderMethodExpr)
-            .setArguments(credentialArgExpr)
-            .setMethodName("setCredentialsProvider")
-            .build();
-    MethodInvocationExpr buildMethodExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(credentialsMethodExpr)
-            .setReturnType(settingsType)
-            .setMethodName("build")
-            .build();
-    Expr initSettingsVarExpr =
-        AssignmentExpr.builder()
-            .setVariableExpr(settingsVarExpr.toBuilder().setIsDecl(true).build())
-            .setValueExpr(buildMethodExpr)
-            .build();
-
-    // Initialized client with create() method.
-    // e.g. EchoClient echoClient = EchoClient.create(echoSettings);
-    VariableExpr clientVarExpr =
-        VariableExpr.withVariable(
-            Variable.builder().setName(clientName).setType(clientType).build());
-    MethodInvocationExpr createMethodExpr =
-        MethodInvocationExpr.builder()
-            .setStaticReferenceType(clientType)
-            .setArguments(settingsVarExpr)
-            .setMethodName("create")
-            .setReturnType(clientType)
-            .build();
-    Expr initClientVarExpr =
-        AssignmentExpr.builder()
-            .setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build())
-            .setValueExpr(createMethodExpr)
-            .build();
-    return SampleCodeWriter.write(
-        Arrays.asList(
-            ExprStatement.withExpr(initSettingsVarExpr),
-            ExprStatement.withExpr(initClientVarExpr)));
-  }
-
-  public static String composeClassHeaderEndpointSampleCode(
-      TypeNode clientType, TypeNode settingsType) {
-    // Initialize client settings with builder() method.
-    // e.g. EchoSettings echoSettings = EchoSettings.newBuilder().setEndpoint("myEndpoint").build();
-    String settingsName = JavaStyle.toLowerCamelCase(settingsType.reference().name());
-    String clientName = JavaStyle.toLowerCamelCase(clientType.reference().name());
-    TypeNode myEndpointType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("myEndpoint")
-                .setPakkage(clientType.reference().pakkage())
-                .build());
-    VariableExpr settingsVarExpr =
-        VariableExpr.withVariable(
-            Variable.builder().setName(settingsName).setType(settingsType).build());
-    MethodInvocationExpr newBuilderMethodExpr =
-        MethodInvocationExpr.builder()
-            .setStaticReferenceType(settingsType)
-            .setMethodName("newBuilder")
-            .build();
-    MethodInvocationExpr credentialsMethodExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(newBuilderMethodExpr)
-            .setArguments(
-                VariableExpr.withVariable(
-                    Variable.builder().setName("myEndpoint").setType(myEndpointType).build()))
-            .setMethodName("setEndpoint")
-            .build();
-    MethodInvocationExpr buildMethodExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(credentialsMethodExpr)
-            .setReturnType(settingsType)
-            .setMethodName("build")
-            .build();
-
-    Expr initSettingsVarExpr =
-        AssignmentExpr.builder()
-            .setVariableExpr(settingsVarExpr.toBuilder().setIsDecl(true).build())
-            .setValueExpr(buildMethodExpr)
-            .build();
-
-    // Initialize client with create() method.
-    // e.g. EchoClient echoClient = EchoClient.create(echoSettings);
-    VariableExpr clientVarExpr =
-        VariableExpr.withVariable(
-            Variable.builder().setName(clientName).setType(clientType).build());
-    MethodInvocationExpr createMethodExpr =
-        MethodInvocationExpr.builder()
-            .setStaticReferenceType(clientType)
-            .setArguments(settingsVarExpr)
-            .setMethodName("create")
-            .setReturnType(clientType)
-            .build();
-    Expr initClientVarExpr =
-        AssignmentExpr.builder()
-            .setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build())
-            .setValueExpr(createMethodExpr)
-            .build();
-
-    return SampleCodeWriter.write(
-        Arrays.asList(
-            ExprStatement.withExpr(initSettingsVarExpr),
-            ExprStatement.withExpr(initClientVarExpr)));
-  }
-
-  public static String composeRpcMethodHeaderSampleCode(
-      Method method,
-      TypeNode clientType,
-      List arguments,
-      Map resourceNames,
-      Map messageTypes) {
-    VariableExpr clientVarExpr =
-        VariableExpr.withVariable(
-            Variable.builder()
-                .setName(JavaStyle.toLowerCamelCase(clientType.reference().name()))
-                .setType(clientType)
-                .build());
-
-    // Assign method's arguments variable with the default values.
-    List rpcMethodArgVarExprs = createRpcMethodArgumentVariableExprs(arguments);
-    List rpcMethodArgDefaultValueExprs =
-        createRpcMethodArgumentDefaultValueExprs(arguments, resourceNames);
-    List rpcMethodArgAssignmentExprs =
-        createAssignmentsForVarExprsWithValueExprs(
-            rpcMethodArgVarExprs, rpcMethodArgDefaultValueExprs);
-
-    List bodyExprs = new ArrayList<>();
-    bodyExprs.addAll(rpcMethodArgAssignmentExprs);
-
-    List bodyStatements = new ArrayList<>();
-    if (method.isPaged()) {
-      bodyStatements.addAll(
-          composeUnaryPagedRpcMethodBodyStatements(
-              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs, messageTypes));
-    } else if (method.hasLro()) {
-      bodyStatements.addAll(
-          composeUnaryLroRpcMethodBodyStatements(
-              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs));
-    } else {
-      bodyStatements.addAll(
-          composeUnaryRpcMethodBodyStatements(
-              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs));
-    }
-
-    return SampleCodeWriter.write(
-        TryCatchStatement.builder()
-            .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
-            .setTryBody(bodyStatements)
-            .setIsSampleCode(true)
-            .build());
-  }
-
-  public static String composeRpcDefaultMethodHeaderSampleCode(
-      Method method,
-      TypeNode clientType,
-      Map resourceNames,
-      Map messageTypes) {
-    VariableExpr clientVarExpr =
-        VariableExpr.withVariable(
-            Variable.builder()
-                .setName(JavaStyle.toLowerCamelCase(clientType.reference().name()))
-                .setType(clientType)
-                .build());
-
-    // Create request variable expression and assign with its default value.
-    VariableExpr requestVarExpr =
-        VariableExpr.withVariable(
-            Variable.builder().setName("request").setType(method.inputType()).build());
-    List rpcMethodArgVarExprs = Arrays.asList(requestVarExpr);
-    Message requestMessage = messageTypes.get(method.inputType().reference().fullName());
-    Preconditions.checkNotNull(
-        requestMessage,
-        String.format(
-            "Could not find the message type %s.", method.inputType().reference().fullName()));
-    Expr requestBuilderExpr =
-        DefaultValueComposer.createSimpleMessageBuilderValue(
-            requestMessage, resourceNames, messageTypes);
-    AssignmentExpr requestAssignmentExpr =
-        AssignmentExpr.builder()
-            .setVariableExpr(requestVarExpr.toBuilder().setIsDecl(true).build())
-            .setValueExpr(requestBuilderExpr)
-            .build();
-
-    List bodyExprs = new ArrayList<>();
-    bodyExprs.add(requestAssignmentExpr);
-
-    List bodyStatements = new ArrayList<>();
-    if (method.isPaged()) {
-      bodyStatements.addAll(
-          composeUnaryPagedRpcMethodBodyStatements(
-              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs, messageTypes));
-    } else if (method.hasLro()) {
-      bodyStatements.addAll(
-          composeUnaryLroRpcMethodBodyStatements(
-              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs));
-    } else {
-      bodyStatements.addAll(
-          composeUnaryRpcMethodBodyStatements(
-              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs));
-    }
-
-    return SampleCodeWriter.write(
-        TryCatchStatement.builder()
-            .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
-            .setTryBody(bodyStatements)
-            .setIsSampleCode(true)
-            .build());
-  }
 
+public class ServiceClientCallableMethodSampleComposer {
   // Compose sample code for the method where it is CallableMethodKind.LRO.
-  public static String composeLroCallableMethodHeaderSampleCode(
+  public static Sample composeLroCallableMethod(
       Method method,
       TypeNode clientType,
       Map resourceNames,
@@ -396,7 +124,6 @@ public static String composeLroCallableMethodHeaderSampleCode(
             .setVariableExpr(operationFutureVarExpr.toBuilder().setIsDecl(true).build())
             .setValueExpr(rpcMethodInvocationExpr)
             .build());
-
     List bodyStatements =
         bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList());
     bodyExprs.clear();
@@ -412,7 +139,7 @@ public static String composeLroCallableMethodHeaderSampleCode(
             .setMethodName("get")
             .setReturnType(method.lro().responseType())
             .build();
-    boolean returnsVoid = isProtoEmptyType(method.lro().responseType());
+    boolean returnsVoid = SampleComposerUtil.isProtoEmptyType(method.lro().responseType());
     if (returnsVoid) {
       bodyExprs.add(futureGetMethodExpr);
     } else {
@@ -435,16 +162,26 @@ public static String composeLroCallableMethodHeaderSampleCode(
         bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList()));
     bodyExprs.clear();
 
-    return SampleCodeWriter.write(
-        TryCatchStatement.builder()
-            .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
-            .setTryBody(bodyStatements)
-            .setIsSampleCode(true)
-            .build());
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientType.reference().name())
+            .setRpcName(method.name())
+            .setIsAsynchronous(true)
+            .setOverloadDisambiguation("OperationCallable")
+            .build();
+    List body =
+        Arrays.asList(
+            TryCatchStatement.builder()
+                .setTryResourceExpr(
+                    SampleComposerUtil.assignClientVariableWithCreateMethodExpr(clientVarExpr))
+                .setTryBody(bodyStatements)
+                .setIsSampleCode(true)
+                .build());
+    return Sample.builder().setBody(body).setRegionTag(regionTag).build();
   }
 
   // Compose sample code for the method where it is CallableMethodKind.PAGED.
-  public static String composePagedCallableMethodHeaderSampleCode(
+  public static Sample composePagedCallableMethod(
       Method method,
       TypeNode clientType,
       Map resourceNames,
@@ -553,17 +290,27 @@ public static String composePagedCallableMethodHeaderSampleCode(
             .setBody(Arrays.asList(lineCommentStatement))
             .build();
     bodyStatements.add(repeatedResponseForStatement);
+    List body =
+        Arrays.asList(
+            TryCatchStatement.builder()
+                .setTryResourceExpr(
+                    SampleComposerUtil.assignClientVariableWithCreateMethodExpr(clientVarExpr))
+                .setTryBody(bodyStatements)
+                .setIsSampleCode(true)
+                .build());
 
-    return SampleCodeWriter.write(
-        TryCatchStatement.builder()
-            .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
-            .setTryBody(bodyStatements)
-            .setIsSampleCode(true)
-            .build());
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientType.reference().name())
+            .setRpcName(method.name())
+            .setIsAsynchronous(true)
+            .setOverloadDisambiguation("PagedCallable")
+            .build();
+    return Sample.builder().setBody(body).setRegionTag(regionTag).build();
   }
 
   // Compose sample code for the method where it is CallableMethodKind.REGULAR.
-  public static String composeRegularCallableMethodHeaderSampleCode(
+  public static Sample composeRegularCallableMethod(
       Method method,
       TypeNode clientType,
       Map resourceNames,
@@ -596,23 +343,32 @@ public static String composeRegularCallableMethodHeaderSampleCode(
     List bodyStatements = new ArrayList<>();
     bodyStatements.add(ExprStatement.withExpr(requestAssignmentExpr));
 
+    RegionTag regionTag;
     if (method.isPaged()) {
-      bodyStatements.addAll(
-          composePagedCallableBodyStatements(method, clientVarExpr, requestVarExpr, messageTypes));
+      Sample pagedCallable =
+          composePagedCallableSample(method, clientVarExpr, requestVarExpr, messageTypes);
+      bodyStatements.addAll(pagedCallable.body());
+      regionTag = pagedCallable.regionTag();
     } else {
-      bodyStatements.addAll(
-          composeUnaryOrLroCallableBodyStatements(method, clientVarExpr, requestVarExpr));
+      // e.g.  echoClient.echoCallable().futureCall(request)
+      Sample unaryOrLroCallable =
+          composeUnaryOrLroCallableSample(method, clientVarExpr, requestVarExpr);
+      bodyStatements.addAll(unaryOrLroCallable.body());
+      regionTag = unaryOrLroCallable.regionTag();
     }
 
-    return SampleCodeWriter.write(
-        TryCatchStatement.builder()
-            .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
-            .setTryBody(bodyStatements)
-            .setIsSampleCode(true)
-            .build());
+    List body =
+        Arrays.asList(
+            TryCatchStatement.builder()
+                .setTryResourceExpr(
+                    SampleComposerUtil.assignClientVariableWithCreateMethodExpr(clientVarExpr))
+                .setTryBody(bodyStatements)
+                .setIsSampleCode(true)
+                .build());
+    return Sample.builder().setBody(body).setRegionTag(regionTag).build();
   }
 
-  public static String composeStreamCallableMethodHeaderSampleCode(
+  public static Sample composeStreamCallableMethod(
       Method method,
       TypeNode clientType,
       Map resourceNames,
@@ -641,167 +397,36 @@ public static String composeStreamCallableMethodHeaderSampleCode(
             .setValueExpr(requestBuilderExpr)
             .build();
 
+    RegionTag regionTag = null;
     List bodyStatements = new ArrayList<>();
-    if (method.stream().equals(Stream.SERVER)) {
-      bodyStatements.addAll(
-          composeStreamServerBodyStatements(method, clientVarExpr, requestAssignmentExpr));
-    } else if (method.stream().equals(Stream.BIDI)) {
-      bodyStatements.addAll(
-          composeStreamBidiBodyStatements(method, clientVarExpr, requestAssignmentExpr));
-    } else if (method.stream().equals(Stream.CLIENT)) {
-      bodyStatements.addAll(
-          composeStreamClientBodyStatements(method, clientVarExpr, requestAssignmentExpr));
+    if (method.stream().equals(Method.Stream.SERVER)) {
+      // e.g. ServerStream stream = echoClient.expandCallable().call(request);
+      Sample streamServer = composeStreamServerSample(method, clientVarExpr, requestAssignmentExpr);
+      bodyStatements.addAll(streamServer.body());
+      regionTag = streamServer.regionTag();
+    } else if (method.stream().equals(Method.Stream.BIDI)) {
+      // e.g. echoClient.collect().clientStreamingCall(responseObserver);
+      Sample streamBidi = composeStreamBidiSample(method, clientVarExpr, requestAssignmentExpr);
+      bodyStatements.addAll(streamBidi.body());
+      regionTag = streamBidi.regionTag();
+    } else if (method.stream().equals(Method.Stream.CLIENT)) {
+      Sample streamClient = composeStreamClientSample(method, clientVarExpr, requestAssignmentExpr);
+      bodyStatements.addAll(streamClient.body());
+      regionTag = streamClient.regionTag();
     }
 
-    return SampleCodeWriter.write(
-        TryCatchStatement.builder()
-            .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
-            .setTryBody(bodyStatements)
-            .setIsSampleCode(true)
-            .build());
-  }
-
-  private static List composeUnaryRpcMethodBodyStatements(
-      Method method,
-      VariableExpr clientVarExpr,
-      List rpcMethodArgVarExprs,
-      List bodyExprs) {
-
-    // Invoke current method based on return type.
-    // e.g. if return void, echoClient.echo(..); or,
-    // e.g. if return other type, EchoResponse response = echoClient.echo(...);
-    boolean returnsVoid = isProtoEmptyType(method.outputType());
-    MethodInvocationExpr clientRpcMethodInvocationExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(clientVarExpr)
-            .setMethodName(JavaStyle.toLowerCamelCase(method.name()))
-            .setArguments(
-                rpcMethodArgVarExprs.stream().map(e -> (Expr) e).collect(Collectors.toList()))
-            .setReturnType(method.outputType())
-            .build();
-    if (returnsVoid) {
-      bodyExprs.add(clientRpcMethodInvocationExpr);
-    } else {
-      VariableExpr responseVarExpr =
-          VariableExpr.withVariable(
-              Variable.builder().setName("response").setType(method.outputType()).build());
-      bodyExprs.add(
-          AssignmentExpr.builder()
-              .setVariableExpr(responseVarExpr.toBuilder().setIsDecl(true).build())
-              .setValueExpr(clientRpcMethodInvocationExpr)
-              .build());
-    }
-
-    return bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList());
-  }
-
-  private static List composeUnaryPagedRpcMethodBodyStatements(
-      Method method,
-      VariableExpr clientVarExpr,
-      List rpcMethodArgVarExprs,
-      List bodyExprs,
-      Map messageTypes) {
-
-    // Find the repeated field.
-    Message methodOutputMessage = messageTypes.get(method.outputType().reference().fullName());
-    Preconditions.checkNotNull(
-        methodOutputMessage,
-        "Output message %s not found, keys: ",
-        method.outputType().reference().fullName(),
-        messageTypes.keySet().toString());
-    Field repeatedPagedResultsField = methodOutputMessage.findAndUnwrapPaginatedRepeatedField();
-    Preconditions.checkNotNull(
-        repeatedPagedResultsField,
-        String.format(
-            "No repeated field found on message %s for method %s",
-            methodOutputMessage.name(), method.name()));
-    TypeNode repeatedResponseType = repeatedPagedResultsField.type();
-
-    // For loop paged response item on iterateAll method.
-    // e.g. for (LogEntry element : loggingServiceV2Client.ListLogs(parent).iterateAll()) {
-    //          //doThingsWith(element);
-    //      }
-    MethodInvocationExpr clientMethodIterateAllExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(clientVarExpr)
-            .setMethodName(JavaStyle.toLowerCamelCase(method.name()))
-            .setArguments(
-                rpcMethodArgVarExprs.stream().map(e -> (Expr) e).collect(Collectors.toList()))
-            .build();
-    clientMethodIterateAllExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(clientMethodIterateAllExpr)
-            .setMethodName("iterateAll")
-            .setReturnType(repeatedResponseType)
-            .build();
-    ForStatement loopIteratorStatement =
-        ForStatement.builder()
-            .setLocalVariableExpr(
-                VariableExpr.builder()
-                    .setVariable(
-                        Variable.builder().setName("element").setType(repeatedResponseType).build())
-                    .setIsDecl(true)
-                    .build())
-            .setCollectionExpr(clientMethodIterateAllExpr)
-            .setBody(
-                Arrays.asList(
-                    CommentStatement.withComment(
-                        LineComment.withComment("doThingsWith(element);"))))
-            .build();
-
-    List bodyStatements =
-        bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList());
-    bodyExprs.clear();
-    bodyStatements.add(loopIteratorStatement);
-
-    return bodyStatements;
-  }
-
-  private static List composeUnaryLroRpcMethodBodyStatements(
-      Method method,
-      VariableExpr clientVarExpr,
-      List rpcMethodArgVarExprs,
-      List bodyExprs) {
-    // Assign response variable with invoking client's LRO method.
-    // e.g. if return void, echoClient.waitAsync(ttl).get(); or,
-    // e.g. if return other type, WaitResponse response = echoClient.waitAsync(ttl).get();
-    Expr invokeLroGetMethodExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(clientVarExpr)
-            .setMethodName(String.format("%sAsync", JavaStyle.toLowerCamelCase(method.name())))
-            .setArguments(
-                rpcMethodArgVarExprs.stream().map(e -> (Expr) e).collect(Collectors.toList()))
-            .build();
-    invokeLroGetMethodExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(invokeLroGetMethodExpr)
-            .setMethodName("get")
-            .setReturnType(method.lro().responseType())
-            .build();
-    boolean returnsVoid = isProtoEmptyType(method.lro().responseType());
-    if (returnsVoid) {
-      bodyExprs.add(invokeLroGetMethodExpr);
-    } else {
-      VariableExpr responseVarExpr =
-          VariableExpr.builder()
-              .setVariable(
-                  Variable.builder()
-                      .setName("response")
-                      .setType(method.lro().responseType())
-                      .build())
-              .setIsDecl(true)
-              .build();
-      bodyExprs.add(
-          AssignmentExpr.builder()
-              .setVariableExpr(responseVarExpr)
-              .setValueExpr(invokeLroGetMethodExpr)
-              .build());
-    }
-
-    return bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList());
+    List body =
+        Arrays.asList(
+            TryCatchStatement.builder()
+                .setTryResourceExpr(
+                    SampleComposerUtil.assignClientVariableWithCreateMethodExpr(clientVarExpr))
+                .setTryBody(bodyStatements)
+                .setIsSampleCode(true)
+                .build());
+    return Sample.builder().setBody(body).setRegionTag(regionTag).build();
   }
 
-  private static List composeStreamServerBodyStatements(
+  private static Sample composeStreamServerSample(
       Method method, VariableExpr clientVarExpr, AssignmentExpr requestAssignmentExpr) {
     List bodyExprs = new ArrayList<>();
     bodyExprs.add(requestAssignmentExpr);
@@ -861,10 +486,17 @@ private static List composeStreamServerBodyStatements(
             .build();
     bodyStatements.add(forStatement);
 
-    return bodyStatements;
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setIsAsynchronous(true)
+            .setOverloadDisambiguation("StreamServer")
+            .build();
+    return Sample.builder().setBody(bodyStatements).setRegionTag(regionTag).build();
   }
 
-  private static List composeStreamBidiBodyStatements(
+  private static Sample composeStreamBidiSample(
       Method method, VariableExpr clientVarExpr, AssignmentExpr requestAssignmentExpr) {
     List bodyExprs = new ArrayList<>();
 
@@ -934,10 +566,17 @@ private static List composeStreamBidiBodyStatements(
             .build();
     bodyStatements.add(forStatement);
 
-    return bodyStatements;
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setIsAsynchronous(true)
+            .setOverloadDisambiguation("StreamBidi")
+            .build();
+    return Sample.builder().setBody(bodyStatements).setRegionTag(regionTag).build();
   }
 
-  private static List composeStreamClientBodyStatements(
+  private static Sample composeStreamClientSample(
       Method method, VariableExpr clientVarExpr, AssignmentExpr requestAssignmentExpr) {
     List bodyExprs = new ArrayList<>();
 
@@ -1060,10 +699,21 @@ private static List composeStreamClientBodyStatements(
             .build();
     bodyExprs.add(onNextMethodExpr);
 
-    return bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList());
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setIsAsynchronous(true)
+            .setOverloadDisambiguation("StreamClient")
+            .build();
+    return Sample.builder()
+        .setBody(
+            bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList()))
+        .setRegionTag(regionTag)
+        .build();
   }
 
-  private static List composeUnaryOrLroCallableBodyStatements(
+  private static Sample composeUnaryOrLroCallableSample(
       Method method, VariableExpr clientVarExpr, VariableExpr requestVarExpr) {
     List bodyStatements = new ArrayList<>();
     // Create api future variable expression, and assign it with a value by invoking callable
@@ -1108,7 +758,7 @@ private static List composeUnaryOrLroCallableBodyStatements(
             .setReturnType(method.outputType())
             .build();
     TypeNode methodOutputType = method.hasLro() ? method.lro().responseType() : method.outputType();
-    boolean returnsVoid = isProtoEmptyType(methodOutputType);
+    boolean returnsVoid = SampleComposerUtil.isProtoEmptyType(methodOutputType);
     if (returnsVoid) {
       bodyStatements.add(ExprStatement.withExpr(getMethodInvocationExpr));
     } else {
@@ -1125,10 +775,17 @@ private static List composeUnaryOrLroCallableBodyStatements(
               .build();
       bodyStatements.add(ExprStatement.withExpr(responseAssignmentExpr));
     }
-    return bodyStatements;
+
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setIsAsynchronous(true)
+            .build();
+    return Sample.builder().setBody(bodyStatements).setRegionTag(regionTag).build();
   }
 
-  private static List composePagedCallableBodyStatements(
+  private static Sample composePagedCallableSample(
       Method method,
       VariableExpr clientVarExpr,
       VariableExpr requestVarExpr,
@@ -1264,92 +921,16 @@ private static List composePagedCallableBodyStatements(
                     PrimitiveValue.builder().setValue("true").setType(TypeNode.BOOLEAN).build()))
             .setBody(whileBodyStatements)
             .build();
-    return Arrays.asList(pagedWhileStatement);
-  }
 
-  // ==================================Helpers===================================================//
-
-  // Create a list of RPC method arguments' variable expressions.
-  private static List createRpcMethodArgumentVariableExprs(
-      List arguments) {
-    return arguments.stream()
-        .map(
-            arg ->
-                VariableExpr.withVariable(
-                    Variable.builder()
-                        .setName(JavaStyle.toLowerCamelCase(arg.name()))
-                        .setType(arg.type())
-                        .build()))
-        .collect(Collectors.toList());
-  }
-
-  // Create a list of RPC method arguments' default value expression.
-  private static List createRpcMethodArgumentDefaultValueExprs(
-      List arguments, Map resourceNames) {
-    List resourceNameList =
-        resourceNames.values().stream().collect(Collectors.toList());
-    Function stringResourceNameDefaultValueExpr =
-        arg ->
-            MethodInvocationExpr.builder()
-                .setExprReferenceExpr(
-                    DefaultValueComposer.createResourceHelperValue(
-                        resourceNames.get(arg.field().resourceReference().resourceTypeString()),
-                        arg.field().resourceReference().isChildType(),
-                        resourceNameList,
-                        arg.field().name()))
-                .setMethodName("toString")
-                .setReturnType(TypeNode.STRING)
-                .build();
-    return arguments.stream()
-        .map(
-            arg ->
-                !isStringTypedResourceName(arg, resourceNames)
-                    ? DefaultValueComposer.createMethodArgValue(
-                        arg, resourceNames, Collections.emptyMap(), Collections.emptyMap())
-                    : stringResourceNameDefaultValueExpr.apply(arg))
-        .collect(Collectors.toList());
-  }
-
-  // Create a list of assignment expressions for variable expr with value expr.
-  private static List createAssignmentsForVarExprsWithValueExprs(
-      List variableExprs, List valueExprs) {
-    Preconditions.checkState(
-        variableExprs.size() == valueExprs.size(),
-        "Expected the number of method arguments to match the number of default values.");
-    return IntStream.range(0, variableExprs.size())
-        .mapToObj(
-            i ->
-                AssignmentExpr.builder()
-                    .setVariableExpr(variableExprs.get(i).toBuilder().setIsDecl(true).build())
-                    .setValueExpr(valueExprs.get(i))
-                    .build())
-        .collect(Collectors.toList());
-  }
-
-  // Assign client variable expr with create client.
-  // e.g EchoClient echoClient = EchoClient.create()
-  private static AssignmentExpr assignClientVariableWithCreateMethodExpr(
-      VariableExpr clientVarExpr) {
-    return AssignmentExpr.builder()
-        .setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build())
-        .setValueExpr(
-            MethodInvocationExpr.builder()
-                .setStaticReferenceType(clientVarExpr.variable().type())
-                .setReturnType(clientVarExpr.variable().type())
-                .setMethodName("create")
-                .build())
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setOverloadDisambiguation("Paged")
+            .build();
+    return Sample.builder()
+        .setBody(Arrays.asList(pagedWhileStatement))
+        .setRegionTag(regionTag)
         .build();
   }
-
-  private static boolean isStringTypedResourceName(
-      MethodArgument arg, Map resourceNames) {
-    return arg.type().equals(TypeNode.STRING)
-        && arg.field().hasResourceReference()
-        && resourceNames.containsKey(arg.field().resourceReference().resourceTypeString());
-  }
-
-  private static boolean isProtoEmptyType(TypeNode type) {
-    return type.reference().pakkage().equals("com.google.protobuf")
-        && type.reference().name().equals("Empty");
-  }
 }
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientHeaderSampleComposer.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientHeaderSampleComposer.java
new file mode 100644
index 0000000000..4ad29804f6
--- /dev/null
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientHeaderSampleComposer.java
@@ -0,0 +1,335 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import com.google.api.gax.core.FixedCredentialsProvider;
+import com.google.api.generator.engine.ast.AssignmentExpr;
+import com.google.api.generator.engine.ast.ConcreteReference;
+import com.google.api.generator.engine.ast.Expr;
+import com.google.api.generator.engine.ast.ExprStatement;
+import com.google.api.generator.engine.ast.MethodInvocationExpr;
+import com.google.api.generator.engine.ast.Statement;
+import com.google.api.generator.engine.ast.TryCatchStatement;
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.VaporReference;
+import com.google.api.generator.engine.ast.Variable;
+import com.google.api.generator.engine.ast.VariableExpr;
+import com.google.api.generator.gapic.composer.defaultvalue.DefaultValueComposer;
+import com.google.api.generator.gapic.model.Message;
+import com.google.api.generator.gapic.model.Method;
+import com.google.api.generator.gapic.model.MethodArgument;
+import com.google.api.generator.gapic.model.RegionTag;
+import com.google.api.generator.gapic.model.ResourceName;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.gapic.model.Service;
+import com.google.api.generator.gapic.utils.JavaStyle;
+import com.google.common.base.Preconditions;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class ServiceClientHeaderSampleComposer {
+  public static Sample composeClassHeaderSample(
+      Service service,
+      TypeNode clientType,
+      Map resourceNames,
+      Map messageTypes) {
+    // Use the first pure unary RPC method's sample code as showcase, if no such method exists, use
+    // the first method in the service's methods list.
+    Method method =
+        service.methods().stream()
+            .filter(m -> m.stream() == Method.Stream.NONE && !m.hasLro() && !m.isPaged())
+            .findFirst()
+            .orElse(service.methods().get(0));
+    if (method.stream() == Method.Stream.NONE) {
+      if (method.methodSignatures().isEmpty()) {
+        return ServiceClientMethodSampleComposer.composeCanonicalSample(
+            method, clientType, resourceNames, messageTypes);
+      }
+      return composeShowcaseMethodSample(
+          method, clientType, method.methodSignatures().get(0), resourceNames, messageTypes);
+    }
+    return ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod(
+        method, clientType, resourceNames, messageTypes);
+  }
+
+  public static Sample composeShowcaseMethodSample(
+      Method method,
+      TypeNode clientType,
+      List arguments,
+      Map resourceNames,
+      Map messageTypes) {
+    VariableExpr clientVarExpr =
+        VariableExpr.withVariable(
+            Variable.builder()
+                .setName(JavaStyle.toLowerCamelCase(clientType.reference().name()))
+                .setType(clientType)
+                .build());
+
+    // Assign method's arguments variable with the default values.
+    List rpcMethodArgVarExprs = createArgumentVariableExprs(arguments);
+    List rpcMethodArgDefaultValueExprs =
+        createArgumentDefaultValueExprs(arguments, resourceNames);
+    List rpcMethodArgAssignmentExprs =
+        createAssignmentsForVarExprsWithValueExprs(
+            rpcMethodArgVarExprs, rpcMethodArgDefaultValueExprs);
+
+    List bodyExprs = new ArrayList<>();
+    bodyExprs.addAll(rpcMethodArgAssignmentExprs);
+
+    List bodyStatements = new ArrayList<>();
+    RegionTag regionTag;
+    if (method.isPaged()) {
+      Sample unaryPagedRpc =
+          ServiceClientMethodSampleComposer.composePagedSample(
+              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs, messageTypes);
+      bodyStatements.addAll(unaryPagedRpc.body());
+      regionTag = unaryPagedRpc.regionTag();
+    } else if (method.hasLro()) {
+      Sample unaryLroRpc =
+          ServiceClientMethodSampleComposer.composeLroSample(
+              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs);
+      bodyStatements.addAll(unaryLroRpc.body());
+      regionTag = unaryLroRpc.regionTag();
+    } else {
+      //  e.g. echoClient.echo(), echoClient.echo(...)
+      Sample unaryRpc =
+          ServiceClientMethodSampleComposer.composeSample(
+              method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs);
+      bodyStatements.addAll(unaryRpc.body());
+      regionTag = unaryRpc.regionTag();
+    }
+
+    List body =
+        Arrays.asList(
+            TryCatchStatement.builder()
+                .setTryResourceExpr(
+                    SampleComposerUtil.assignClientVariableWithCreateMethodExpr(clientVarExpr))
+                .setTryBody(bodyStatements)
+                .setIsSampleCode(true)
+                .build());
+    return Sample.builder().setBody(body).setRegionTag(regionTag).build();
+  }
+
+  public static Sample composeSetCredentialsSample(TypeNode clientType, TypeNode settingsType) {
+    // Initialize clientSettings with builder() method.
+    // e.g. EchoSettings echoSettings =
+    // EchoSettings.newBuilder().setCredentialsProvider(FixedCredentialsProvider.create("myCredentials")).build();
+    String settingsName = JavaStyle.toLowerCamelCase(settingsType.reference().name());
+    String clientName = JavaStyle.toLowerCamelCase(clientType.reference().name());
+    TypeNode myCredentialsType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("myCredentials")
+                .setPakkage(clientType.reference().pakkage())
+                .build());
+    VariableExpr settingsVarExpr =
+        VariableExpr.withVariable(
+            Variable.builder().setName(settingsName).setType(settingsType).build());
+    MethodInvocationExpr newBuilderMethodExpr =
+        MethodInvocationExpr.builder()
+            .setStaticReferenceType(settingsType)
+            .setMethodName("newBuilder")
+            .build();
+    TypeNode fixedCredentialProvideType =
+        TypeNode.withReference(ConcreteReference.withClazz(FixedCredentialsProvider.class));
+    MethodInvocationExpr credentialArgExpr =
+        MethodInvocationExpr.builder()
+            .setStaticReferenceType(fixedCredentialProvideType)
+            .setArguments(
+                VariableExpr.withVariable(
+                    Variable.builder().setName("myCredentials").setType(myCredentialsType).build()))
+            .setMethodName("create")
+            .build();
+    MethodInvocationExpr credentialsMethodExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(newBuilderMethodExpr)
+            .setArguments(credentialArgExpr)
+            .setMethodName("setCredentialsProvider")
+            .build();
+    MethodInvocationExpr buildMethodExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(credentialsMethodExpr)
+            .setReturnType(settingsType)
+            .setMethodName("build")
+            .build();
+    Expr initSettingsVarExpr =
+        AssignmentExpr.builder()
+            .setVariableExpr(settingsVarExpr.toBuilder().setIsDecl(true).build())
+            .setValueExpr(buildMethodExpr)
+            .build();
+
+    // Initialized client with create() method.
+    // e.g. EchoClient echoClient = EchoClient.create(echoSettings);
+    VariableExpr clientVarExpr =
+        VariableExpr.withVariable(
+            Variable.builder().setName(clientName).setType(clientType).build());
+    MethodInvocationExpr createMethodExpr =
+        MethodInvocationExpr.builder()
+            .setStaticReferenceType(clientType)
+            .setArguments(settingsVarExpr)
+            .setMethodName("create")
+            .setReturnType(clientType)
+            .build();
+    String rpcName = createMethodExpr.methodIdentifier().name();
+    Expr initClientVarExpr =
+        AssignmentExpr.builder()
+            .setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build())
+            .setValueExpr(createMethodExpr)
+            .build();
+
+    List sampleBody =
+        Arrays.asList(
+            ExprStatement.withExpr(initSettingsVarExpr), ExprStatement.withExpr(initClientVarExpr));
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientName)
+            .setRpcName(rpcName)
+            .setOverloadDisambiguation("setCredentialsProvider")
+            .build();
+    return Sample.builder().setBody(sampleBody).setRegionTag(regionTag).build();
+  }
+
+  public static Sample composeSetEndpointSample(TypeNode clientType, TypeNode settingsType) {
+    // Initialize client settings with builder() method.
+    // e.g. EchoSettings echoSettings = EchoSettings.newBuilder().setEndpoint("myEndpoint").build();
+    String settingsName = JavaStyle.toLowerCamelCase(settingsType.reference().name());
+    String clientName = JavaStyle.toLowerCamelCase(clientType.reference().name());
+    TypeNode myEndpointType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("myEndpoint")
+                .setPakkage(clientType.reference().pakkage())
+                .build());
+    VariableExpr settingsVarExpr =
+        VariableExpr.withVariable(
+            Variable.builder().setName(settingsName).setType(settingsType).build());
+    MethodInvocationExpr newBuilderMethodExpr =
+        MethodInvocationExpr.builder()
+            .setStaticReferenceType(settingsType)
+            .setMethodName("newBuilder")
+            .build();
+    MethodInvocationExpr credentialsMethodExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(newBuilderMethodExpr)
+            .setArguments(
+                VariableExpr.withVariable(
+                    Variable.builder().setName("myEndpoint").setType(myEndpointType).build()))
+            .setMethodName("setEndpoint")
+            .build();
+    MethodInvocationExpr buildMethodExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(credentialsMethodExpr)
+            .setReturnType(settingsType)
+            .setMethodName("build")
+            .build();
+
+    Expr initSettingsVarExpr =
+        AssignmentExpr.builder()
+            .setVariableExpr(settingsVarExpr.toBuilder().setIsDecl(true).build())
+            .setValueExpr(buildMethodExpr)
+            .build();
+
+    // Initialize client with create() method.
+    // e.g. EchoClient echoClient = EchoClient.create(echoSettings);
+    VariableExpr clientVarExpr =
+        VariableExpr.withVariable(
+            Variable.builder().setName(clientName).setType(clientType).build());
+    MethodInvocationExpr createMethodExpr =
+        MethodInvocationExpr.builder()
+            .setStaticReferenceType(clientType)
+            .setArguments(settingsVarExpr)
+            .setMethodName("create")
+            .setReturnType(clientType)
+            .build();
+    String rpcName = createMethodExpr.methodIdentifier().name();
+    Expr initClientVarExpr =
+        AssignmentExpr.builder()
+            .setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build())
+            .setValueExpr(createMethodExpr)
+            .build();
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientName)
+            .setRpcName(rpcName)
+            .setOverloadDisambiguation("setEndpoint")
+            .build();
+    List sampleBody =
+        Arrays.asList(
+            ExprStatement.withExpr(initSettingsVarExpr), ExprStatement.withExpr(initClientVarExpr));
+    return Sample.builder().setBody(sampleBody).setRegionTag(regionTag).build();
+  }
+
+  // Create a list of RPC method arguments' variable expressions.
+  private static List createArgumentVariableExprs(List arguments) {
+    return arguments.stream()
+        .map(
+            arg ->
+                VariableExpr.withVariable(
+                    Variable.builder()
+                        .setName(JavaStyle.toLowerCamelCase(arg.name()))
+                        .setType(arg.type())
+                        .build()))
+        .collect(Collectors.toList());
+  }
+
+  // Create a list of RPC method arguments' default value expression.
+  private static List createArgumentDefaultValueExprs(
+      List arguments, Map resourceNames) {
+    List resourceNameList =
+        resourceNames.values().stream().collect(Collectors.toList());
+    Function stringResourceNameDefaultValueExpr =
+        arg ->
+            MethodInvocationExpr.builder()
+                .setExprReferenceExpr(
+                    DefaultValueComposer.createResourceHelperValue(
+                        resourceNames.get(arg.field().resourceReference().resourceTypeString()),
+                        arg.field().resourceReference().isChildType(),
+                        resourceNameList,
+                        arg.field().name()))
+                .setMethodName("toString")
+                .setReturnType(TypeNode.STRING)
+                .build();
+    return arguments.stream()
+        .map(
+            arg ->
+                !SampleComposerUtil.isStringTypedResourceName(arg, resourceNames)
+                    ? DefaultValueComposer.createMethodArgValue(
+                        arg, resourceNames, Collections.emptyMap(), Collections.emptyMap())
+                    : stringResourceNameDefaultValueExpr.apply(arg))
+        .collect(Collectors.toList());
+  }
+
+  // Create a list of assignment expressions for variable expr with value expr.
+  private static List createAssignmentsForVarExprsWithValueExprs(
+      List variableExprs, List valueExprs) {
+    Preconditions.checkState(
+        variableExprs.size() == valueExprs.size(),
+        "Expected the number of method arguments to match the number of default values.");
+    return IntStream.range(0, variableExprs.size())
+        .mapToObj(
+            i ->
+                AssignmentExpr.builder()
+                    .setVariableExpr(variableExprs.get(i).toBuilder().setIsDecl(true).build())
+                    .setValueExpr(valueExprs.get(i))
+                    .build())
+        .collect(Collectors.toList());
+  }
+}
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientMethodSampleComposer.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientMethodSampleComposer.java
new file mode 100644
index 0000000000..100686c8e0
--- /dev/null
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientMethodSampleComposer.java
@@ -0,0 +1,281 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import com.google.api.generator.engine.ast.AssignmentExpr;
+import com.google.api.generator.engine.ast.CommentStatement;
+import com.google.api.generator.engine.ast.Expr;
+import com.google.api.generator.engine.ast.ExprStatement;
+import com.google.api.generator.engine.ast.ForStatement;
+import com.google.api.generator.engine.ast.LineComment;
+import com.google.api.generator.engine.ast.MethodInvocationExpr;
+import com.google.api.generator.engine.ast.Statement;
+import com.google.api.generator.engine.ast.TryCatchStatement;
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.Variable;
+import com.google.api.generator.engine.ast.VariableExpr;
+import com.google.api.generator.gapic.composer.defaultvalue.DefaultValueComposer;
+import com.google.api.generator.gapic.model.Field;
+import com.google.api.generator.gapic.model.Message;
+import com.google.api.generator.gapic.model.Method;
+import com.google.api.generator.gapic.model.RegionTag;
+import com.google.api.generator.gapic.model.ResourceName;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.gapic.utils.JavaStyle;
+import com.google.common.base.Preconditions;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class ServiceClientMethodSampleComposer {
+  public static Sample composeCanonicalSample(
+      Method method,
+      TypeNode clientType,
+      Map resourceNames,
+      Map messageTypes) {
+    VariableExpr clientVarExpr =
+        VariableExpr.withVariable(
+            Variable.builder()
+                .setName(JavaStyle.toLowerCamelCase(clientType.reference().name()))
+                .setType(clientType)
+                .build());
+
+    // Create request variable expression and assign with its default value.
+    VariableExpr requestVarExpr =
+        VariableExpr.withVariable(
+            Variable.builder().setName("request").setType(method.inputType()).build());
+    List rpcMethodArgVarExprs = Arrays.asList(requestVarExpr);
+    Message requestMessage = messageTypes.get(method.inputType().reference().fullName());
+    Preconditions.checkNotNull(
+        requestMessage,
+        String.format(
+            "Could not find the message type %s.", method.inputType().reference().fullName()));
+    Expr requestBuilderExpr =
+        DefaultValueComposer.createSimpleMessageBuilderValue(
+            requestMessage, resourceNames, messageTypes);
+    AssignmentExpr requestAssignmentExpr =
+        AssignmentExpr.builder()
+            .setVariableExpr(requestVarExpr.toBuilder().setIsDecl(true).build())
+            .setValueExpr(requestBuilderExpr)
+            .build();
+
+    List bodyExprs = new ArrayList<>();
+    bodyExprs.add(requestAssignmentExpr);
+
+    List bodyStatements = new ArrayList<>();
+    RegionTag regionTag;
+    if (method.isPaged()) {
+      // e.g. echoClient.pagedExpand(request).iterateAll()
+      Sample unaryPagedRpc =
+          composePagedSample(method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs, messageTypes);
+      bodyStatements.addAll(unaryPagedRpc.body());
+      regionTag = unaryPagedRpc.regionTag();
+    } else if (method.hasLro()) {
+      Sample unaryLroRpc = composeLroSample(method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs);
+      bodyStatements.addAll(unaryLroRpc.body());
+      regionTag = unaryLroRpc.regionTag();
+    } else {
+      // e.g. echoClient.echo(request)
+      Sample unaryRpc = composeSample(method, clientVarExpr, rpcMethodArgVarExprs, bodyExprs);
+      bodyStatements.addAll(unaryRpc.body());
+      regionTag = unaryRpc.regionTag();
+    }
+
+    List body =
+        Arrays.asList(
+            TryCatchStatement.builder()
+                .setTryResourceExpr(
+                    SampleComposerUtil.assignClientVariableWithCreateMethodExpr(clientVarExpr))
+                .setTryBody(bodyStatements)
+                .setIsSampleCode(true)
+                .build());
+    //  setting overloadDisambiguation to empty since this is the canonical snippet
+    return Sample.builder()
+        .setBody(body)
+        .setRegionTag(regionTag.withOverloadDisambiguation(""))
+        .build();
+  }
+
+  static Sample composeSample(
+      Method method,
+      VariableExpr clientVarExpr,
+      List rpcMethodArgVarExprs,
+      List bodyExprs) {
+
+    // Invoke current method based on return type.
+    // e.g. if return void, echoClient.echo(..); or,
+    // e.g. if return other type, EchoResponse response = echoClient.echo(...);
+    boolean returnsVoid = SampleComposerUtil.isProtoEmptyType(method.outputType());
+    MethodInvocationExpr clientRpcMethodInvocationExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(clientVarExpr)
+            .setMethodName(JavaStyle.toLowerCamelCase(method.name()))
+            .setArguments(
+                rpcMethodArgVarExprs.stream().map(e -> (Expr) e).collect(Collectors.toList()))
+            .setReturnType(method.outputType())
+            .build();
+    if (returnsVoid) {
+      bodyExprs.add(clientRpcMethodInvocationExpr);
+    } else {
+      VariableExpr responseVarExpr =
+          VariableExpr.withVariable(
+              Variable.builder().setName("response").setType(method.outputType()).build());
+      bodyExprs.add(
+          AssignmentExpr.builder()
+              .setVariableExpr(responseVarExpr.toBuilder().setIsDecl(true).build())
+              .setValueExpr(clientRpcMethodInvocationExpr)
+              .build());
+    }
+
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setOverloadDisambiguation(
+                SampleComposerUtil.createOverloadDisambiguation(rpcMethodArgVarExprs))
+            .build();
+    return Sample.builder()
+        .setBody(
+            bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList()))
+        .setRegionTag(regionTag)
+        .build();
+  }
+
+  static Sample composePagedSample(
+      Method method,
+      VariableExpr clientVarExpr,
+      List rpcMethodArgVarExprs,
+      List bodyExprs,
+      Map messageTypes) {
+
+    // Find the repeated field.
+    Message methodOutputMessage = messageTypes.get(method.outputType().reference().fullName());
+    Preconditions.checkNotNull(
+        methodOutputMessage,
+        "Output message %s not found, keys: ",
+        method.outputType().reference().fullName(),
+        messageTypes.keySet().toString());
+    Field repeatedPagedResultsField = methodOutputMessage.findAndUnwrapPaginatedRepeatedField();
+    Preconditions.checkNotNull(
+        repeatedPagedResultsField,
+        String.format(
+            "No repeated field found on message %s for method %s",
+            methodOutputMessage.name(), method.name()));
+    TypeNode repeatedResponseType = repeatedPagedResultsField.type();
+
+    // For loop paged response item on iterateAll method.
+    // e.g. for (LogEntry element : loggingServiceV2Client.ListLogs(parent).iterateAll()) {
+    //          //doThingsWith(element);
+    //      }
+    MethodInvocationExpr clientMethodIterateAllExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(clientVarExpr)
+            .setMethodName(JavaStyle.toLowerCamelCase(method.name()))
+            .setArguments(
+                rpcMethodArgVarExprs.stream().map(e -> (Expr) e).collect(Collectors.toList()))
+            .build();
+
+    clientMethodIterateAllExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(clientMethodIterateAllExpr)
+            .setMethodName("iterateAll")
+            .setReturnType(repeatedResponseType)
+            .build();
+    ForStatement loopIteratorStatement =
+        ForStatement.builder()
+            .setLocalVariableExpr(
+                VariableExpr.builder()
+                    .setVariable(
+                        Variable.builder().setName("element").setType(repeatedResponseType).build())
+                    .setIsDecl(true)
+                    .build())
+            .setCollectionExpr(clientMethodIterateAllExpr)
+            .setBody(
+                Arrays.asList(
+                    CommentStatement.withComment(
+                        LineComment.withComment("doThingsWith(element);"))))
+            .build();
+
+    List bodyStatements =
+        bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList());
+    bodyExprs.clear();
+    bodyStatements.add(loopIteratorStatement);
+
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setOverloadDisambiguation(
+                SampleComposerUtil.createOverloadDisambiguation(rpcMethodArgVarExprs))
+            .build();
+    return Sample.builder().setBody(bodyStatements).setRegionTag(regionTag).build();
+  }
+
+  static Sample composeLroSample(
+      Method method,
+      VariableExpr clientVarExpr,
+      List rpcMethodArgVarExprs,
+      List bodyExprs) {
+    // Assign response variable with invoking client's LRO method.
+    // e.g. if return void, echoClient.waitAsync(ttl).get(); or,
+    // e.g. if return other type, WaitResponse response = echoClient.waitAsync(ttl).get();
+    MethodInvocationExpr invokeLroGetMethodExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(clientVarExpr)
+            .setMethodName(String.format("%sAsync", JavaStyle.toLowerCamelCase(method.name())))
+            .setArguments(
+                rpcMethodArgVarExprs.stream().map(e -> (Expr) e).collect(Collectors.toList()))
+            .build();
+    invokeLroGetMethodExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(invokeLroGetMethodExpr)
+            .setMethodName("get")
+            .setReturnType(method.lro().responseType())
+            .build();
+    boolean returnsVoid = SampleComposerUtil.isProtoEmptyType(method.lro().responseType());
+    if (returnsVoid) {
+      bodyExprs.add(invokeLroGetMethodExpr);
+    } else {
+      VariableExpr responseVarExpr =
+          VariableExpr.builder()
+              .setVariable(
+                  Variable.builder()
+                      .setName("response")
+                      .setType(method.lro().responseType())
+                      .build())
+              .setIsDecl(true)
+              .build();
+      bodyExprs.add(
+          AssignmentExpr.builder()
+              .setVariableExpr(responseVarExpr)
+              .setValueExpr(invokeLroGetMethodExpr)
+              .build());
+    }
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(clientVarExpr.variable().identifier().name())
+            .setRpcName(method.name())
+            .setOverloadDisambiguation(
+                SampleComposerUtil.createOverloadDisambiguation(rpcMethodArgVarExprs))
+            .build();
+    return Sample.builder()
+        .setBody(
+            bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList()))
+        .setRegionTag(regionTag)
+        .build();
+  }
+}
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleCodeComposer.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleComposer.java
similarity index 92%
rename from src/main/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleCodeComposer.java
rename to src/main/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleComposer.java
index 9c554b0be0..9027f50000 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleCodeComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleComposer.java
@@ -25,6 +25,8 @@
 import com.google.api.generator.engine.ast.VaporReference;
 import com.google.api.generator.engine.ast.Variable;
 import com.google.api.generator.engine.ast.VariableExpr;
+import com.google.api.generator.gapic.model.RegionTag;
+import com.google.api.generator.gapic.model.Sample;
 import com.google.api.generator.gapic.utils.JavaStyle;
 import java.time.Duration;
 import java.util.Arrays;
@@ -32,9 +34,9 @@
 import java.util.Optional;
 import java.util.stream.Collectors;
 
-public final class SettingsSampleCodeComposer {
+public final class SettingsSampleComposer {
 
-  public static Optional composeSampleCode(
+  public static Optional composeSettingsSample(
       Optional methodNameOpt, String settingsClassName, TypeNode classType) {
     if (!methodNameOpt.isPresent()) {
       return Optional.empty();
@@ -76,6 +78,7 @@ public static Optional composeSampleCode(
             .setMethodName(
                 JavaStyle.toLowerCamelCase(String.format("%sSettings", methodNameOpt.get())))
             .build();
+    String disambiguation = "Settings";
     MethodInvocationExpr retrySettingsArgExpr =
         MethodInvocationExpr.builder()
             .setExprReferenceExpr(settingBuilderMethodInvocationExpr)
@@ -121,6 +124,7 @@ public static Optional composeSampleCode(
                 .setType(classType)
                 .setName(JavaStyle.toLowerCamelCase(settingsClassName))
                 .build());
+
     AssignmentExpr settingBuildAssignmentExpr =
         AssignmentExpr.builder()
             .setVariableExpr(settingsVarExpr.toBuilder().setIsDecl(true).build())
@@ -140,6 +144,12 @@ public static Optional composeSampleCode(
             .stream()
             .map(e -> ExprStatement.withExpr(e))
             .collect(Collectors.toList());
-    return Optional.of(SampleCodeWriter.write(statements));
+
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setServiceName(classType.reference().name())
+            .setRpcName(methodNameOpt.get())
+            .build();
+    return Optional.of(Sample.builder().setBody(statements).setRegionTag(regionTag).build());
   }
 }
diff --git a/src/main/java/com/google/api/generator/gapic/model/GapicClass.java b/src/main/java/com/google/api/generator/gapic/model/GapicClass.java
index 8ae0376efc..bc2c8bb858 100644
--- a/src/main/java/com/google/api/generator/gapic/model/GapicClass.java
+++ b/src/main/java/com/google/api/generator/gapic/model/GapicClass.java
@@ -16,6 +16,10 @@
 
 import com.google.api.generator.engine.ast.ClassDefinition;
 import com.google.auto.value.AutoValue;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
 
 @AutoValue
 public abstract class GapicClass {
@@ -31,12 +35,25 @@ public enum Kind {
 
   public abstract ClassDefinition classDefinition();
 
+  public abstract List samples();
+
   public static GapicClass create(Kind kind, ClassDefinition classDefinition) {
     return builder().setKind(kind).setClassDefinition(classDefinition).build();
   }
 
+  public static GapicClass create(
+      Kind kind, ClassDefinition classDefinition, List samples) {
+    return builder().setKind(kind).setClassDefinition(classDefinition).setSamples(samples).build();
+  }
+
   static Builder builder() {
-    return new AutoValue_GapicClass.Builder();
+    return new AutoValue_GapicClass.Builder().setSamples(Collections.emptyList());
+  }
+
+  abstract Builder toBuilder();
+
+  public final GapicClass withSamples(List samples) {
+    return toBuilder().setSamples(samples).build();
   }
 
   @AutoValue.Builder
@@ -45,6 +62,54 @@ abstract static class Builder {
 
     abstract Builder setClassDefinition(ClassDefinition classDefinition);
 
-    abstract GapicClass build();
+    abstract Builder setSamples(List samples);
+
+    abstract GapicClass autoBuild();
+
+    abstract List samples();
+
+    public final GapicClass build() {
+      setSamples(handleDuplicateSamples(samples()));
+      return autoBuild();
+    }
+  }
+
+  private static List handleDuplicateSamples(List samples) {
+    //  filter out any duplicate samples and group by sample name
+    Map> distinctSamplesGroupedByName =
+        samples.stream().distinct().collect(Collectors.groupingBy(s -> s.name()));
+
+    // grab unique samples
+    List uniqueSamples =
+        distinctSamplesGroupedByName.entrySet().stream()
+            .filter(entry -> entry.getValue().size() < 2)
+            .map(entry -> entry.getValue().get(0))
+            .collect(Collectors.toList());
+
+    // grab distinct samples with same name - similar version of same sample
+    List>> duplicateDistinctSamples =
+        distinctSamplesGroupedByName.entrySet().stream()
+            .filter(entry -> entry.getValue().size() > 1)
+            .collect(Collectors.toList());
+
+    // update similar samples regionTag/name so filesname/regiontag are unique
+    for (Map.Entry> entry : duplicateDistinctSamples) {
+      int sampleNum = 0;
+      for (Sample sample : entry.getValue()) {
+        //  first sample will be canonical, not updating disambiguation
+        Sample uniqueSample = sample;
+        if (sampleNum != 0) {
+          uniqueSample =
+              sample.withRegionTag(
+                  sample
+                      .regionTag()
+                      .withOverloadDisambiguation(
+                          sample.regionTag().overloadDisambiguation() + sampleNum));
+        }
+        uniqueSamples.add(uniqueSample);
+        sampleNum++;
+      }
+    }
+    return uniqueSamples;
   }
 }
diff --git a/src/main/java/com/google/api/generator/gapic/model/RegionTag.java b/src/main/java/com/google/api/generator/gapic/model/RegionTag.java
new file mode 100644
index 0000000000..cc740ec33e
--- /dev/null
+++ b/src/main/java/com/google/api/generator/gapic/model/RegionTag.java
@@ -0,0 +1,131 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.model;
+
+import com.google.api.generator.engine.ast.CommentStatement;
+import com.google.api.generator.engine.ast.LineComment;
+import com.google.api.generator.gapic.utils.JavaStyle;
+import com.google.auto.value.AutoValue;
+import com.google.common.base.Preconditions;
+
+@AutoValue
+public abstract class RegionTag {
+  public abstract String apiShortName();
+
+  public abstract String apiVersion();
+
+  public abstract String serviceName();
+
+  public abstract String rpcName();
+
+  public abstract String overloadDisambiguation();
+
+  public abstract Boolean isAsynchronous();
+
+  public static Builder builder() {
+    return new AutoValue_RegionTag.Builder()
+        .setApiVersion("")
+        .setApiShortName("")
+        .setOverloadDisambiguation("")
+        .setIsAsynchronous(false);
+  }
+
+  abstract RegionTag.Builder toBuilder();
+
+  public final RegionTag withApiVersion(String apiVersion) {
+    return toBuilder().setApiVersion(apiVersion).build();
+  }
+
+  public final RegionTag withApiShortName(String apiShortName) {
+    return toBuilder().setApiShortName(apiShortName).build();
+  }
+
+  public final RegionTag withOverloadDisambiguation(String overloadDisambiguation) {
+    return toBuilder().setOverloadDisambiguation(overloadDisambiguation).build();
+  }
+
+  @AutoValue.Builder
+  public abstract static class Builder {
+    public abstract Builder setApiVersion(String apiVersion);
+
+    public abstract Builder setApiShortName(String apiShortName);
+
+    public abstract Builder setServiceName(String serviceName);
+
+    public abstract Builder setRpcName(String rpcName);
+
+    public abstract Builder setOverloadDisambiguation(String overloadDisambiguation);
+
+    public abstract Builder setIsAsynchronous(Boolean isAsynchronous);
+
+    abstract String apiVersion();
+
+    abstract String apiShortName();
+
+    abstract String serviceName();
+
+    abstract String rpcName();
+
+    abstract String overloadDisambiguation();
+
+    abstract RegionTag autoBuild();
+
+    public final RegionTag build() {
+      setApiVersion(sanitizeAttributes(apiVersion()));
+      setApiShortName(sanitizeAttributes(apiShortName()));
+      setServiceName(sanitizeAttributes(serviceName()));
+      setRpcName(sanitizeAttributes(rpcName()));
+      setOverloadDisambiguation(sanitizeAttributes(overloadDisambiguation()));
+      return autoBuild();
+    }
+
+    private final String sanitizeAttributes(String attribute) {
+      return JavaStyle.toUpperCamelCase(attribute.replaceAll("[^a-zA-Z0-9]", ""));
+    }
+  }
+
+  public enum RegionTagRegion {
+    START,
+    END
+  }
+
+  public String generate() {
+    Preconditions.checkState(!apiShortName().isEmpty(), "apiShortName can't be empty");
+    Preconditions.checkState(!serviceName().isEmpty(), "serviceName can't be empty");
+    Preconditions.checkState(!rpcName().isEmpty(), "rpcName can't be empty");
+
+    String rt = apiShortName() + "_";
+    if (!apiVersion().isEmpty()) {
+      rt = rt + apiVersion() + "_";
+    }
+    rt = rt + "generated_" + serviceName() + "_" + rpcName();
+    if (!overloadDisambiguation().isEmpty()) {
+      rt = rt + "_" + overloadDisambiguation();
+    }
+    if (isAsynchronous()) {
+      rt = rt + "_async";
+    } else {
+      rt = rt + "_sync";
+    }
+
+    return rt.toLowerCase();
+  }
+
+  public static CommentStatement generateTag(
+      RegionTagRegion regionTagRegion, String regionTagContent) {
+    return CommentStatement.withComment(
+        LineComment.withComment("[" + regionTagRegion.name() + " " + regionTagContent + "]"));
+  }
+}
diff --git a/src/main/java/com/google/api/generator/gapic/model/Sample.java b/src/main/java/com/google/api/generator/gapic/model/Sample.java
new file mode 100644
index 0000000000..5e5458a54d
--- /dev/null
+++ b/src/main/java/com/google/api/generator/gapic/model/Sample.java
@@ -0,0 +1,83 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.model;
+
+import com.google.api.generator.engine.ast.AssignmentExpr;
+import com.google.api.generator.engine.ast.CommentStatement;
+import com.google.api.generator.engine.ast.Statement;
+import com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableList;
+import java.util.List;
+
+@AutoValue
+public abstract class Sample {
+  public abstract List body();
+
+  public abstract List variableAssignments();
+
+  public abstract List fileHeader();
+
+  public abstract RegionTag regionTag();
+
+  public abstract String name();
+
+  public static Builder builder() {
+    return new AutoValue_Sample.Builder()
+        .setBody(ImmutableList.of())
+        .setVariableAssignments(ImmutableList.of())
+        .setFileHeader(ImmutableList.of());
+  }
+
+  abstract Builder toBuilder();
+
+  public final Sample withHeader(List header) {
+    return toBuilder().setFileHeader(header).build();
+  }
+
+  public final Sample withRegionTag(RegionTag regionTag) {
+    return toBuilder()
+        .setName(generateSampleClassName(regionTag()))
+        .setRegionTag(regionTag)
+        .build();
+  }
+
+  @AutoValue.Builder
+  public abstract static class Builder {
+    public abstract Builder setBody(List body);
+
+    public abstract Builder setVariableAssignments(List variableAssignments);
+
+    public abstract Builder setFileHeader(List header);
+
+    public abstract Builder setRegionTag(RegionTag regionTag);
+
+    abstract Builder setName(String name);
+
+    abstract Sample autoBuild();
+
+    abstract RegionTag regionTag();
+
+    public final Sample build() {
+      setName(generateSampleClassName(regionTag()));
+      return autoBuild();
+    }
+  }
+
+  private static String generateSampleClassName(RegionTag regionTag) {
+    return (regionTag.isAsynchronous() ? "Async" : "Sync")
+        + regionTag.rpcName()
+        + regionTag.overloadDisambiguation();
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceCallableFactoryClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceCallableFactoryClassComposerTest.java
index 3f90ae955f..7269d61140 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceCallableFactoryClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceCallableFactoryClassComposerTest.java
@@ -14,14 +14,10 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
 import org.junit.Test;
 
 public class GrpcServiceCallableFactoryClassComposerTest {
@@ -32,12 +28,8 @@ public void generateServiceClasses() {
     GapicClass clazz =
         GrpcServiceCallableFactoryClassComposer.instance().generate(context, echoProtoService);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "GrpcEchoCallableFactory.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "GrpcEchoCallableFactory.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcEchoCallableFactory.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 
   @Test
@@ -47,13 +39,7 @@ public void generateServiceClasses_deprecated() {
     GapicClass clazz =
         GrpcServiceCallableFactoryClassComposer.instance().generate(context, protoService);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(
-        this.getClass(), "GrpcDeprecatedServiceCallableFactory.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(
-            Utils.getGoldenDir(this.getClass()), "GrpcDeprecatedServiceCallableFactory.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcDeprecatedServiceCallableFactory.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java
index e26d8696e8..f41143acbe 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java
@@ -14,14 +14,10 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
 import org.junit.Test;
 
 public class GrpcServiceStubClassComposerTest {
@@ -31,11 +27,8 @@ public void generateGrpcServiceStubClass_simple() {
     Service echoProtoService = context.services().get(0);
     GapicClass clazz = GrpcServiceStubClassComposer.instance().generate(context, echoProtoService);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "GrpcEchoStub.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "GrpcEchoStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcEchoStub.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 
   @Test
@@ -44,12 +37,8 @@ public void generateGrpcServiceStubClass_deprecated() {
     Service protoService = context.services().get(0);
     GapicClass clazz = GrpcServiceStubClassComposer.instance().generate(context, protoService);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "GrpcDeprecatedServiceStub.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "GrpcDeprecatedServiceStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcDeprecatedServiceStub.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 
   @Test
@@ -58,11 +47,8 @@ public void generateGrpcServiceStubClass_httpBindings() {
     Service service = context.services().get(0);
     GapicClass clazz = GrpcServiceStubClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "GrpcTestingStub.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "GrpcTestingStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcTestingStub.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 
   @Test
@@ -72,12 +58,8 @@ public void generateGrpcServiceStubClass_routingHeaders() {
     Service service = context.services().get(0);
     GapicClass clazz = GrpcServiceStubClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "GrpcRoutingHeadersStub.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "GrpcRoutingHeadersStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcRoutingHeadersStub.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 
   @Test
@@ -86,12 +68,8 @@ public void generateGrpcServiceStubClass_httpBindingsWithSubMessageFields() {
     Service service = context.services().get(0);
     GapicClass clazz = GrpcServiceStubClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "GrpcPublisherStub.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "GrpcPublisherStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcPublisherStub.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 
   @Test
@@ -100,10 +78,7 @@ public void generateGrpcServiceStubClass_createBatchingCallable() {
     Service service = context.services().get(0);
     GapicClass clazz = GrpcServiceStubClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "GrpcLoggingStub.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "GrpcLoggingStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcLoggingStub.golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceClassComposerTest.java
index b8f17b5934..7762c6a4df 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceClassComposerTest.java
@@ -14,41 +14,38 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Collection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
+@RunWith(Parameterized.class)
 public class MockServiceClassComposerTest {
-  @Test
-  public void generateServiceClasses() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseEcho();
-    Service echoProtoService = context.services().get(0);
-    GapicClass clazz = MockServiceClassComposer.instance().generate(context, echoProtoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "MockEcho.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "MockEcho.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+  @Parameterized.Parameters
+  public static Collection data() {
+    return Arrays.asList(
+        new Object[][] {
+          {"MockEcho", GrpcTestProtoLoader.instance().parseShowcaseEcho()},
+          {"MockDeprecatedService", GrpcTestProtoLoader.instance().parseDeprecatedService()}
+        });
   }
 
+  @Parameterized.Parameter public String name;
+
+  @Parameterized.Parameter(1)
+  public GapicContext context;
+
   @Test
-  public void generateServiceClasses_deprecated() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseDeprecatedService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = MockServiceClassComposer.instance().generate(context, protoService);
+  public void generateMockServiceClasses() {
+    Service service = context.services().get(0);
+    GapicClass clazz = MockServiceClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "MockDeprecatedService.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "MockDeprecatedService.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, name + ".golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceImplClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceImplClassComposerTest.java
index 854d0772dd..aa062279ec 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceImplClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/MockServiceImplClassComposerTest.java
@@ -14,41 +14,38 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Collection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
+@RunWith(Parameterized.class)
 public class MockServiceImplClassComposerTest {
-  @Test
-  public void generateServiceClasses() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseEcho();
-    Service echoProtoService = context.services().get(0);
-    GapicClass clazz = MockServiceImplClassComposer.instance().generate(context, echoProtoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "MockEchoImpl.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "MockEchoImpl.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+  @Parameterized.Parameters
+  public static Collection data() {
+    return Arrays.asList(
+        new Object[][] {
+          {"MockEchoImpl", GrpcTestProtoLoader.instance().parseShowcaseEcho()},
+          {"MockDeprecatedServiceImpl", GrpcTestProtoLoader.instance().parseDeprecatedService()}
+        });
   }
 
+  @Parameterized.Parameter public String name;
+
+  @Parameterized.Parameter(1)
+  public GapicContext context;
+
   @Test
-  public void generateServiceClasses_deprecated() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseDeprecatedService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = MockServiceImplClassComposer.instance().generate(context, protoService);
+  public void generateMockServiceImplClasses() {
+    Service service = context.services().get(0);
+    GapicClass clazz = MockServiceImplClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "MockDeprecatedServiceImpl.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "MockDeprecatedServiceImpl.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, name + ".golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientClassComposerTest.java
index 46134ebff8..fe00c3ca04 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientClassComposerTest.java
@@ -14,81 +14,42 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import static com.google.api.generator.test.framework.Assert.assertCodeEquals;
-
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import com.google.api.generator.test.framework.Assert;
+import java.util.Arrays;
+import java.util.Collection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
+@RunWith(Parameterized.class)
 public class ServiceClientClassComposerTest {
-  @Test
-  public void generateServiceClasses() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseEcho();
-    Service echoProtoService = context.services().get(0);
-    GapicClass clazz = ServiceClientClassComposer.instance().generate(context, echoProtoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "EchoClient.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "EchoClient.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
+  @Parameterized.Parameters
+  public static Collection data() {
+    return Arrays.asList(
+        new Object[][] {
+          {"EchoClient", GrpcTestProtoLoader.instance().parseShowcaseEcho()},
+          {"DeprecatedServiceClient", GrpcTestProtoLoader.instance().parseDeprecatedService()},
+          {"IdentityClient", GrpcTestProtoLoader.instance().parseShowcaseIdentity()},
+          {"BookshopClient", GrpcTestProtoLoader.instance().parseBookshopService()},
+          {"MessagingClient", GrpcTestProtoLoader.instance().parseShowcaseMessaging()},
+        });
   }
 
-  @Test
-  public void generateServiceClasses_deprecated() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseDeprecatedService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceClientClassComposer.instance().generate(context, protoService);
+  @Parameterized.Parameter public String name;
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "DeprecatedServiceClient.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "DeprecatedServiceClient.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
-  }
-
-  @Test
-  public void generateServiceClasses_methodSignatureHasNestedFields() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseIdentity();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceClientClassComposer.instance().generate(context, protoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "IdentityClient.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "IdentityClient.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
-  }
-
-  @Test
-  public void generateServiceClasses_bookshopNameConflicts() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseBookshopService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceClientClassComposer.instance().generate(context, protoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "BookshopClient.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "BookshopClient.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
-  }
+  @Parameterized.Parameter(1)
+  public GapicContext context;
 
   @Test
-  public void generateServiceClasses_childTypeParentInJavadoc() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseMessaging();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceClientClassComposer.instance().generate(context, protoService);
+  public void generateServiceClientClasses() {
+    Service service = context.services().get(0);
+    GapicClass clazz = ServiceClientClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "MessagingClient.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "MessagingClient.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, name + ".golden");
+    Assert.assertGoldenSamples(
+        this.getClass(), name, clazz.classDefinition().packageString(), clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposerTest.java
index 9874286d82..0eca4e060d 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposerTest.java
@@ -14,89 +14,49 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import static com.google.api.generator.test.framework.Assert.assertCodeEquals;
-import static org.junit.Assert.assertEquals;
-
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import com.google.api.generator.test.framework.Assert;
+import java.util.Arrays;
+import java.util.Collection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
+@RunWith(Parameterized.class)
 public class ServiceClientTestClassComposerTest {
-  @Test
-  public void generateClientTest_echoClient() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseEcho();
-    Service echoProtoService = context.services().get(0);
-    GapicClass clazz =
-        ServiceClientTestClassComposer.instance().generate(context, echoProtoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "EchoClientTest.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "EchoClientTest.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
+  @Parameterized.Parameters
+  public static Collection data() {
+    return Arrays.asList(
+        new Object[][] {
+          {"EchoClientTest", GrpcTestProtoLoader.instance().parseShowcaseEcho(), 0},
+          {
+            "DeprecatedServiceClientTest",
+            GrpcTestProtoLoader.instance().parseDeprecatedService(),
+            0
+          },
+          {"TestingClientTest", GrpcTestProtoLoader.instance().parseShowcaseTesting(), 0},
+          {"SubscriberClientTest", GrpcTestProtoLoader.instance().parsePubSubPublisher(), 1},
+          {"LoggingClientTest", GrpcTestProtoLoader.instance().parseLogging(), 0},
+        });
   }
 
-  @Test
-  public void generateClientTest_deprecatedServiceClient() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseDeprecatedService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceClientTestClassComposer.instance().generate(context, protoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "DeprecatedServiceClientTest.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "DeprecatedServiceClientTest.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
-  }
+  @Parameterized.Parameter public String name;
 
-  @Test
-  public void generateClientTest_testingClientResnameWithOnePatternWithNonSlashSepNames() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseTesting();
-    Service testingProtoService = context.services().get(0);
-    GapicClass clazz =
-        ServiceClientTestClassComposer.instance().generate(context, testingProtoService);
+  @Parameterized.Parameter(1)
+  public GapicContext context;
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "TestingClientTest.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "TestingClientTest.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
-  }
+  @Parameterized.Parameter(2)
+  public int serviceIndex;
 
   @Test
-  public void generateClientTest_pubSubPublisherClient() {
-    GapicContext context = GrpcTestProtoLoader.instance().parsePubSubPublisher();
-    Service subscriptionService = context.services().get(1);
-    assertEquals("Subscriber", subscriptionService.name());
+  public void generateServiceClientTestClasses() {
+    Service echoProtoService = context.services().get(serviceIndex);
     GapicClass clazz =
-        ServiceClientTestClassComposer.instance().generate(context, subscriptionService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "SubscriberClientTest.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "SubscriberClientTest.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
-  }
-
-  @Test
-  public void generateClientTest_logging() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseLogging();
-    Service loggingService = context.services().get(0);
-    GapicClass clazz = ServiceClientTestClassComposer.instance().generate(context, loggingService);
+        ServiceClientTestClassComposer.instance().generate(context, echoProtoService);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "LoggingClientTest.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "LoggingClientTest.golden");
-    assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, name + ".golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceSettingsClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceSettingsClassComposerTest.java
index 622cf85f9c..5857ef3352 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceSettingsClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceSettingsClassComposerTest.java
@@ -14,41 +14,43 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
+import com.google.api.generator.gapic.composer.common.TestProtoLoader;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Collection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
+@RunWith(Parameterized.class)
 public class ServiceSettingsClassComposerTest {
-  @Test
-  public void generateServiceClasses() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseEcho();
-    Service echoProtoService = context.services().get(0);
-    GapicClass clazz = ServiceSettingsClassComposer.instance().generate(context, echoProtoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "EchoSettings.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "EchoSettings.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+  @Parameterized.Parameters
+  public static Collection data() {
+    return Arrays.asList(
+        new Object[][] {
+          {"EchoSettings", TestProtoLoader.instance().parseShowcaseEcho()},
+          {"DeprecatedServiceSettings", TestProtoLoader.instance().parseDeprecatedService()}
+        });
   }
 
+  @Parameterized.Parameter public String name;
+
+  @Parameterized.Parameter(1)
+  public GapicContext context;
+
   @Test
-  public void generateServiceClasses_deprecated() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseDeprecatedService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceSettingsClassComposer.instance().generate(context, protoService);
+  public void generateServiceSettingsClasses() {
+    Service service = context.services().get(0);
+    GapicClass clazz = ServiceSettingsClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "DeprecatedServiceSettings.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "DeprecatedServiceSettings.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, name + ".golden");
+    Assert.assertGoldenSamples(
+        this.getClass(),
+        "servicesettings",
+        clazz.classDefinition().packageString(),
+        clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubClassComposerTest.java
index bb411b9ad3..bb0619d315 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubClassComposerTest.java
@@ -14,42 +14,39 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.composer.common.TestProtoLoader;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Collection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
+@RunWith(Parameterized.class)
 public class ServiceStubClassComposerTest {
-  @Test
-  public void generateServiceClasses() {
-    GapicContext context = TestProtoLoader.instance().parseShowcaseEcho();
-    Service echoProtoService = context.services().get(0);
-    GapicClass clazz = ServiceStubClassComposer.instance().generate(context, echoProtoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "EchoStub.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "EchoStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+  @Parameterized.Parameters
+  public static Collection data() {
+    return Arrays.asList(
+        new Object[][] {
+          {"EchoStub", TestProtoLoader.instance().parseShowcaseEcho()},
+          {"DeprecatedServiceStub", TestProtoLoader.instance().parseDeprecatedService()}
+        });
   }
 
+  @Parameterized.Parameter public String name;
+
+  @Parameterized.Parameter(1)
+  public GapicContext context;
+
   @Test
-  public void generateServiceClasses_deprecated() {
-    GapicContext context = TestProtoLoader.instance().parseDeprecatedService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceStubClassComposer.instance().generate(context, protoService);
+  public void generateServiceStubClasses() {
+    Service service = context.services().get(0);
+    GapicClass clazz = ServiceStubClassComposer.instance().generate(context, service);
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "DeprecatedServiceStub.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "DeprecatedServiceStub.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+    Assert.assertGoldenClass(this.getClass(), clazz, name + ".golden");
+    Assert.assertEmptySamples(clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java
index 468c2d8219..9a63099d7d 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java
@@ -14,75 +14,44 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import static org.junit.Assert.assertEquals;
-
-import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
-import com.google.api.generator.test.framework.Utils;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Collection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
+@RunWith(Parameterized.class)
 public class ServiceStubSettingsClassComposerTest {
-  @Test
-  public void generateServiceStubSettingsClasses_batchingWithEmptyResponses() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseLogging();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceStubSettingsClassComposer.instance().generate(context, protoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(
-        this.getClass(), "LoggingServiceV2StubSettings.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "LoggingServiceV2StubSettings.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
-  }
-
-  @Test
-  public void generateServiceStubSettingsClasses_batchingWithNonemptyResponses() {
-    GapicContext context = GrpcTestProtoLoader.instance().parsePubSubPublisher();
-    Service protoService = context.services().get(0);
-    assertEquals("Publisher", protoService.name());
-    GapicClass clazz = ServiceStubSettingsClassComposer.instance().generate(context, protoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "PublisherStubSettings.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "PublisherStubSettings.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+  @Parameterized.Parameters
+  public static Collection data() {
+    return Arrays.asList(
+        new Object[][] {
+          {"LoggingServiceV2StubSettings", GrpcTestProtoLoader.instance().parseLogging()},
+          {"PublisherStubSettings", GrpcTestProtoLoader.instance().parsePubSubPublisher()},
+          {"EchoStubSettings", GrpcTestProtoLoader.instance().parseShowcaseEcho()},
+          {"DeprecatedServiceStubSettings", GrpcTestProtoLoader.instance().parseDeprecatedService()}
+        });
   }
 
-  @Test
-  public void generateServiceStubSettingsClasses_basic() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseShowcaseEcho();
-    Service echoProtoService = context.services().get(0);
-    GapicClass clazz =
-        ServiceStubSettingsClassComposer.instance().generate(context, echoProtoService);
+  @Parameterized.Parameter public String name;
 
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(this.getClass(), "EchoStubSettings.golden", visitor.write());
-    Path goldenFilePath = Paths.get(Utils.getGoldenDir(this.getClass()), "EchoStubSettings.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
-  }
+  @Parameterized.Parameter(1)
+  public GapicContext context;
 
   @Test
-  public void generateServiceStubSettingsClasses_deprecated() {
-    GapicContext context = GrpcTestProtoLoader.instance().parseDeprecatedService();
-    Service protoService = context.services().get(0);
-    GapicClass clazz = ServiceStubSettingsClassComposer.instance().generate(context, protoService);
-
-    JavaWriterVisitor visitor = new JavaWriterVisitor();
-    clazz.classDefinition().accept(visitor);
-    Utils.saveCodegenToFile(
-        this.getClass(), "DeprecatedServiceStubSettings.golden", visitor.write());
-    Path goldenFilePath =
-        Paths.get(Utils.getGoldenDir(this.getClass()), "DeprecatedServiceStubSettings.golden");
-    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+  public void generateServiceStubSettingsClasses() {
+    Service service = context.services().get(0);
+    GapicClass clazz = ServiceStubSettingsClassComposer.instance().generate(context, service);
+
+    Assert.assertGoldenClass(this.getClass(), clazz, name + ".golden");
+    Assert.assertGoldenSamples(
+        this.getClass(),
+        "servicesettings/stub",
+        clazz.classDefinition().packageString(),
+        clazz.samples());
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/BookshopClient.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/BookshopClient.golden
index 069bd7a634..70c66dc794 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/BookshopClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/BookshopClient.golden
@@ -16,6 +16,8 @@ import javax.annotation.Generated;
  * that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (BookshopClient bookshopClient = BookshopClient.create()) {
  *   int booksCount = 1618425911;
  *   List books = new ArrayList<>();
@@ -52,6 +54,8 @@ import javax.annotation.Generated;
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * BookshopSettings bookshopSettings =
  *     BookshopSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -62,6 +66,8 @@ import javax.annotation.Generated;
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * BookshopSettings bookshopSettings =
  *     BookshopSettings.newBuilder().setEndpoint(myEndpoint).build();
  * BookshopClient bookshopClient = BookshopClient.create(bookshopSettings);
@@ -126,6 +132,8 @@ public class BookshopClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BookshopClient bookshopClient = BookshopClient.create()) {
    *   int booksCount = 1618425911;
    *   List books = new ArrayList<>();
@@ -148,6 +156,8 @@ public class BookshopClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BookshopClient bookshopClient = BookshopClient.create()) {
    *   String booksList = "booksList2-1119589686";
    *   List books = new ArrayList<>();
@@ -170,6 +180,8 @@ public class BookshopClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BookshopClient bookshopClient = BookshopClient.create()) {
    *   GetBookRequest request =
    *       GetBookRequest.newBuilder()
@@ -193,6 +205,8 @@ public class BookshopClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BookshopClient bookshopClient = BookshopClient.create()) {
    *   GetBookRequest request =
    *       GetBookRequest.newBuilder()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceClient.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceClient.golden
index 9af83eb743..4e5cbaad3f 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceClient.golden
@@ -16,6 +16,8 @@ import javax.annotation.Generated;
  * that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
  *   FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
  *   deprecatedServiceClient.fastFibonacci(request);
@@ -52,6 +54,8 @@ import javax.annotation.Generated;
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * DeprecatedServiceSettings deprecatedServiceSettings =
  *     DeprecatedServiceSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -63,6 +67,8 @@ import javax.annotation.Generated;
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * DeprecatedServiceSettings deprecatedServiceSettings =
  *     DeprecatedServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
  * DeprecatedServiceClient deprecatedServiceClient =
@@ -132,6 +138,8 @@ public class DeprecatedServiceClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
    *   FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
    *   deprecatedServiceClient.fastFibonacci(request);
@@ -150,6 +158,8 @@ public class DeprecatedServiceClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
    *   FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
    *   ApiFuture future = deprecatedServiceClient.fastFibonacciCallable().futureCall(request);
@@ -167,6 +177,8 @@ public class DeprecatedServiceClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
    *   FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
    *   deprecatedServiceClient.slowFibonacci(request);
@@ -187,6 +199,8 @@ public class DeprecatedServiceClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
    *   FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
    *   ApiFuture future = deprecatedServiceClient.slowFibonacciCallable().futureCall(request);
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceSettings.golden
index 5e61122577..4d71e3f312 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceSettings.golden
@@ -35,6 +35,8 @@ import javax.annotation.Generated;
  * 
For example, to set the total timeout of fastFibonacci to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * DeprecatedServiceSettings.Builder deprecatedServiceSettingsBuilder =
  *     DeprecatedServiceSettings.newBuilder();
  * deprecatedServiceSettingsBuilder
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceStubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceStubSettings.golden
index 899b03bbce..8ace8d9fde 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceStubSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/DeprecatedServiceStubSettings.golden
@@ -44,6 +44,8 @@ import org.threeten.bp.Duration;
  * 
For example, to set the total timeout of fastFibonacci to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * DeprecatedServiceStubSettings.Builder deprecatedServiceSettingsBuilder =
  *     DeprecatedServiceStubSettings.newBuilder();
  * deprecatedServiceSettingsBuilder
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden
index 3e6735f6bd..e7d55114c3 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden
@@ -34,6 +34,8 @@ import javax.annotation.Generated;
  * that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (EchoClient echoClient = EchoClient.create()) {
  *   EchoResponse response = echoClient.echo();
  * }
@@ -68,6 +70,8 @@ import javax.annotation.Generated;
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * EchoSettings echoSettings =
  *     EchoSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -78,6 +82,8 @@ import javax.annotation.Generated;
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * EchoSettings echoSettings = EchoSettings.newBuilder().setEndpoint(myEndpoint).build();
  * EchoClient echoClient = EchoClient.create(echoSettings);
  * }

@@ -152,6 +158,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   EchoResponse response = echoClient.echo();
    * }
@@ -170,6 +178,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   ResourceName parent = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]");
    *   EchoResponse response = echoClient.echo(parent);
@@ -190,6 +200,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   Status error = Status.newBuilder().build();
    *   EchoResponse response = echoClient.echo(error);
@@ -209,6 +221,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   FoobarName name = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]");
    *   EchoResponse response = echoClient.echo(name);
@@ -229,6 +243,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   String content = "content951530617";
    *   EchoResponse response = echoClient.echo(content);
@@ -248,6 +264,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   String name = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString();
    *   EchoResponse response = echoClient.echo(name);
@@ -267,6 +285,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   String parent = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString();
    *   EchoResponse response = echoClient.echo(parent);
@@ -286,6 +306,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   String content = "content951530617";
    *   Severity severity = Severity.forNumber(0);
@@ -308,6 +330,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   EchoRequest request =
    *       EchoRequest.newBuilder()
@@ -332,6 +356,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   EchoRequest request =
    *       EchoRequest.newBuilder()
@@ -355,6 +381,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   ExpandRequest request =
    *       ExpandRequest.newBuilder().setContent("content951530617").setInfo("info3237038").build();
@@ -374,6 +402,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   ApiStreamObserver responseObserver =
    *       new ApiStreamObserver() {
@@ -414,6 +444,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   BidiStream bidiStream = echoClient.chatCallable().call();
    *   EchoRequest request =
@@ -439,6 +471,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   BidiStream bidiStream = echoClient.chatAgainCallable().call();
    *   EchoRequest request =
@@ -464,6 +498,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   PagedExpandRequest request =
    *       PagedExpandRequest.newBuilder()
@@ -489,6 +525,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   PagedExpandRequest request =
    *       PagedExpandRequest.newBuilder()
@@ -514,6 +552,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   PagedExpandRequest request =
    *       PagedExpandRequest.newBuilder()
@@ -545,6 +585,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   for (EchoResponse element : echoClient.simplePagedExpand().iterateAll()) {
    *     // doThingsWith(element);
@@ -565,6 +607,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   PagedExpandRequest request =
    *       PagedExpandRequest.newBuilder()
@@ -590,6 +634,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   PagedExpandRequest request =
    *       PagedExpandRequest.newBuilder()
@@ -616,6 +662,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   PagedExpandRequest request =
    *       PagedExpandRequest.newBuilder()
@@ -647,6 +695,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   Duration ttl = Duration.newBuilder().build();
    *   WaitResponse response = echoClient.waitAsync(ttl).get();
@@ -666,6 +716,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   Timestamp endTime = Timestamp.newBuilder().build();
    *   WaitResponse response = echoClient.waitAsync(endTime).get();
@@ -685,6 +737,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   WaitRequest request = WaitRequest.newBuilder().build();
    *   WaitResponse response = echoClient.waitAsync(request).get();
@@ -703,6 +757,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   WaitRequest request = WaitRequest.newBuilder().build();
    *   OperationFuture future =
@@ -721,6 +777,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   WaitRequest request = WaitRequest.newBuilder().build();
    *   ApiFuture future = echoClient.waitCallable().futureCall(request);
@@ -738,6 +796,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   BlockRequest request = BlockRequest.newBuilder().build();
    *   BlockResponse response = echoClient.block(request);
@@ -756,6 +816,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   BlockRequest request = BlockRequest.newBuilder().build();
    *   ApiFuture future = echoClient.blockCallable().futureCall(request);
@@ -773,6 +835,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   EchoRequest request =
    *       EchoRequest.newBuilder()
@@ -797,6 +861,8 @@ public class EchoClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (EchoClient echoClient = EchoClient.create()) {
    *   EchoRequest request =
    *       EchoRequest.newBuilder()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden
index e88ba04676..09fc6298a2 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden
@@ -42,6 +42,8 @@ import javax.annotation.Generated;
  * 
For example, to set the total timeout of echo to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * EchoSettings.Builder echoSettingsBuilder = EchoSettings.newBuilder();
  * echoSettingsBuilder
  *     .echoSettings()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden
index 2006b2a30d..1bef1dc27e 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden
@@ -70,6 +70,8 @@ import org.threeten.bp.Duration;
  * 
For example, to set the total timeout of echo to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * EchoStubSettings.Builder echoSettingsBuilder = EchoStubSettings.newBuilder();
  * echoSettingsBuilder
  *     .echoSettings()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/IdentityClient.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/IdentityClient.golden
index 235c0055b6..36a0848d94 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/IdentityClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/IdentityClient.golden
@@ -24,6 +24,8 @@ import javax.annotation.Generated;
  * that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (IdentityClient identityClient = IdentityClient.create()) {
  *   String parent = UserName.of("[USER]").toString();
  *   String displayName = "displayName1714148973";
@@ -61,6 +63,8 @@ import javax.annotation.Generated;
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IdentitySettings identitySettings =
  *     IdentitySettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -71,6 +75,8 @@ import javax.annotation.Generated;
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IdentitySettings identitySettings =
  *     IdentitySettings.newBuilder().setEndpoint(myEndpoint).build();
  * IdentityClient identityClient = IdentityClient.create(identitySettings);
@@ -135,6 +141,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   String parent = UserName.of("[USER]").toString();
    *   String displayName = "displayName1714148973";
@@ -162,6 +170,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   String parent = UserName.of("[USER]").toString();
    *   String displayName = "displayName1714148973";
@@ -214,6 +224,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   String parent = UserName.of("[USER]").toString();
    *   String displayName = "displayName1714148973";
@@ -299,6 +311,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   CreateUserRequest request =
    *       CreateUserRequest.newBuilder()
@@ -321,6 +335,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   CreateUserRequest request =
    *       CreateUserRequest.newBuilder()
@@ -342,6 +358,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   UserName name = UserName.of("[USER]");
    *   User response = identityClient.getUser(name);
@@ -362,6 +380,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   String name = UserName.of("[USER]").toString();
    *   User response = identityClient.getUser(name);
@@ -381,6 +401,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   GetUserRequest request =
    *       GetUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
@@ -400,6 +422,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   GetUserRequest request =
    *       GetUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
@@ -418,6 +442,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   UpdateUserRequest request =
    *       UpdateUserRequest.newBuilder().setUser(User.newBuilder().build()).build();
@@ -437,6 +463,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   UpdateUserRequest request =
    *       UpdateUserRequest.newBuilder().setUser(User.newBuilder().build()).build();
@@ -455,6 +483,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   UserName name = UserName.of("[USER]");
    *   identityClient.deleteUser(name);
@@ -475,6 +505,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   String name = UserName.of("[USER]").toString();
    *   identityClient.deleteUser(name);
@@ -494,6 +526,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   DeleteUserRequest request =
    *       DeleteUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
@@ -513,6 +547,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   DeleteUserRequest request =
    *       DeleteUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
@@ -531,6 +567,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   ListUsersRequest request =
    *       ListUsersRequest.newBuilder()
@@ -555,6 +593,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   ListUsersRequest request =
    *       ListUsersRequest.newBuilder()
@@ -578,6 +618,8 @@ public class IdentityClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IdentityClient identityClient = IdentityClient.create()) {
    *   ListUsersRequest request =
    *       ListUsersRequest.newBuilder()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/LoggingServiceV2StubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/LoggingServiceV2StubSettings.golden
index cc308eb5de..c19e424304 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/LoggingServiceV2StubSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/LoggingServiceV2StubSettings.golden
@@ -77,6 +77,8 @@ import org.threeten.bp.Duration;
  * 
For example, to set the total timeout of deleteLog to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LoggingServiceV2StubSettings.Builder loggingServiceV2SettingsBuilder =
  *     LoggingServiceV2StubSettings.newBuilder();
  * loggingServiceV2SettingsBuilder
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MessagingClient.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MessagingClient.golden
index e881597fde..d6e3b7da73 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MessagingClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MessagingClient.golden
@@ -32,6 +32,8 @@ import javax.annotation.Generated;
  * that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (MessagingClient messagingClient = MessagingClient.create()) {
  *   String displayName = "displayName1714148973";
  *   String description = "description-1724546052";
@@ -68,6 +70,8 @@ import javax.annotation.Generated;
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * MessagingSettings messagingSettings =
  *     MessagingSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -78,6 +82,8 @@ import javax.annotation.Generated;
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * MessagingSettings messagingSettings =
  *     MessagingSettings.newBuilder().setEndpoint(myEndpoint).build();
  * MessagingClient messagingClient = MessagingClient.create(messagingSettings);
@@ -153,6 +159,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String displayName = "displayName1714148973";
    *   String description = "description-1724546052";
@@ -178,6 +186,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   CreateRoomRequest request =
    *       CreateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
@@ -197,6 +207,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   CreateRoomRequest request =
    *       CreateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
@@ -215,6 +227,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   RoomName name = RoomName.of("[ROOM]");
    *   Room response = messagingClient.getRoom(name);
@@ -235,6 +249,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String name = RoomName.of("[ROOM]").toString();
    *   Room response = messagingClient.getRoom(name);
@@ -254,6 +270,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   GetRoomRequest request =
    *       GetRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
@@ -273,6 +291,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   GetRoomRequest request =
    *       GetRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
@@ -291,6 +311,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   UpdateRoomRequest request =
    *       UpdateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
@@ -310,6 +332,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   UpdateRoomRequest request =
    *       UpdateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
@@ -328,6 +352,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   RoomName name = RoomName.of("[ROOM]");
    *   messagingClient.deleteRoom(name);
@@ -348,6 +374,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String name = RoomName.of("[ROOM]").toString();
    *   messagingClient.deleteRoom(name);
@@ -367,6 +395,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   DeleteRoomRequest request =
    *       DeleteRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
@@ -386,6 +416,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   DeleteRoomRequest request =
    *       DeleteRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
@@ -404,6 +436,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ListRoomsRequest request =
    *       ListRoomsRequest.newBuilder()
@@ -428,6 +462,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ListRoomsRequest request =
    *       ListRoomsRequest.newBuilder()
@@ -451,6 +487,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ListRoomsRequest request =
    *       ListRoomsRequest.newBuilder()
@@ -481,6 +519,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ProfileName parent = ProfileName.of("[USER]");
    *   ByteString image = ByteString.EMPTY;
@@ -506,6 +546,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ProfileName parent = ProfileName.of("[USER]");
    *   String text = "text3556653";
@@ -531,6 +573,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   RoomName parent = RoomName.of("[ROOM]");
    *   ByteString image = ByteString.EMPTY;
@@ -556,6 +600,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   RoomName parent = RoomName.of("[ROOM]");
    *   String text = "text3556653";
@@ -581,6 +627,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String parent = ProfileName.of("[USER]").toString();
    *   ByteString image = ByteString.EMPTY;
@@ -606,6 +654,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String parent = ProfileName.of("[USER]").toString();
    *   String text = "text3556653";
@@ -631,6 +681,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   CreateBlurbRequest request =
    *       CreateBlurbRequest.newBuilder()
@@ -653,6 +705,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   CreateBlurbRequest request =
    *       CreateBlurbRequest.newBuilder()
@@ -674,6 +728,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   BlurbName name = BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]");
    *   Blurb response = messagingClient.getBlurb(name);
@@ -694,6 +750,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String name =
    *       BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]").toString();
@@ -714,6 +772,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   GetBlurbRequest request =
    *       GetBlurbRequest.newBuilder()
@@ -737,6 +797,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   GetBlurbRequest request =
    *       GetBlurbRequest.newBuilder()
@@ -759,6 +821,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   UpdateBlurbRequest request =
    *       UpdateBlurbRequest.newBuilder().setBlurb(Blurb.newBuilder().build()).build();
@@ -778,6 +842,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   UpdateBlurbRequest request =
    *       UpdateBlurbRequest.newBuilder().setBlurb(Blurb.newBuilder().build()).build();
@@ -796,6 +862,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   BlurbName name = BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]");
    *   messagingClient.deleteBlurb(name);
@@ -816,6 +884,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String name =
    *       BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]").toString();
@@ -836,6 +906,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   DeleteBlurbRequest request =
    *       DeleteBlurbRequest.newBuilder()
@@ -859,6 +931,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   DeleteBlurbRequest request =
    *       DeleteBlurbRequest.newBuilder()
@@ -881,6 +955,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ProfileName parent = ProfileName.of("[USER]");
    *   for (Blurb element : messagingClient.listBlurbs(parent).iterateAll()) {
@@ -903,6 +979,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   RoomName parent = RoomName.of("[ROOM]");
    *   for (Blurb element : messagingClient.listBlurbs(parent).iterateAll()) {
@@ -925,6 +1003,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String parent = ProfileName.of("[USER]").toString();
    *   for (Blurb element : messagingClient.listBlurbs(parent).iterateAll()) {
@@ -946,6 +1026,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ListBlurbsRequest request =
    *       ListBlurbsRequest.newBuilder()
@@ -971,6 +1053,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ListBlurbsRequest request =
    *       ListBlurbsRequest.newBuilder()
@@ -995,6 +1079,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ListBlurbsRequest request =
    *       ListBlurbsRequest.newBuilder()
@@ -1026,6 +1112,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   String query = "query107944136";
    *   SearchBlurbsResponse response = messagingClient.searchBlurbsAsync(query).get();
@@ -1046,6 +1134,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   SearchBlurbsRequest request =
    *       SearchBlurbsRequest.newBuilder()
@@ -1071,6 +1161,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   SearchBlurbsRequest request =
    *       SearchBlurbsRequest.newBuilder()
@@ -1096,6 +1188,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   SearchBlurbsRequest request =
    *       SearchBlurbsRequest.newBuilder()
@@ -1119,6 +1213,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   StreamBlurbsRequest request =
    *       StreamBlurbsRequest.newBuilder().setName(ProfileName.of("[USER]").toString()).build();
@@ -1140,6 +1236,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   ApiStreamObserver responseObserver =
    *       new ApiStreamObserver() {
@@ -1179,6 +1277,8 @@ public class MessagingClient implements BackgroundResource {
    * Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MessagingClient messagingClient = MessagingClient.create()) {
    *   BidiStream bidiStream =
    *       messagingClient.connectCallable().call();
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/PublisherStubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/PublisherStubSettings.golden
index d050f8a921..2c13fc0f02 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/PublisherStubSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/PublisherStubSettings.golden
@@ -78,6 +78,8 @@ import org.threeten.bp.Duration;
  * 
For example, to set the total timeout of createTopic to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * PublisherStubSettings.Builder publisherSettingsBuilder = PublisherStubSettings.newBuilder();
  * publisherSettingsBuilder
  *     .createTopicSettings()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/AsyncGetBook.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/AsyncGetBook.golden
new file mode 100644
index 0000000000..5797b9ea1b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/AsyncGetBook.golden
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.bookshop.v1beta1.samples;
+
+// [START goldensample_generated_bookshopclient_getbook_async]
+import com.google.api.core.ApiFuture;
+import com.google.bookshop.v1beta1.Book;
+import com.google.bookshop.v1beta1.BookshopClient;
+import com.google.bookshop.v1beta1.GetBookRequest;
+import java.util.ArrayList;
+
+public class AsyncGetBook {
+
+  public static void main(String[] args) throws Exception {
+    asyncGetBook();
+  }
+
+  public static void asyncGetBook() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (BookshopClient bookshopClient = BookshopClient.create()) {
+      GetBookRequest request =
+          GetBookRequest.newBuilder()
+              .setBooksCount1(1618425911)
+              .setBooksList2("booksList2-1119589686")
+              .addAllBooks3(new ArrayList())
+              .build();
+      ApiFuture future = bookshopClient.getBookCallable().futureCall(request);
+      // Do something.
+      Book response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_bookshopclient_getbook_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncCreateSetCredentialsProvider.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncCreateSetCredentialsProvider.golden
new file mode 100644
index 0000000000..6561d22d89
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncCreateSetCredentialsProvider.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.bookshop.v1beta1.samples;
+
+// [START goldensample_generated_bookshopclient_create_setcredentialsprovider_sync]
+import com.google.api.gax.core.FixedCredentialsProvider;
+import com.google.bookshop.v1beta1.BookshopClient;
+import com.google.bookshop.v1beta1.BookshopSettings;
+import com.google.bookshop.v1beta1.myCredentials;
+
+public class SyncCreateSetCredentialsProvider {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetCredentialsProvider();
+  }
+
+  public static void syncCreateSetCredentialsProvider() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    BookshopSettings bookshopSettings =
+        BookshopSettings.newBuilder()
+            .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
+            .build();
+    BookshopClient bookshopClient = BookshopClient.create(bookshopSettings);
+  }
+}
+// [END goldensample_generated_bookshopclient_create_setcredentialsprovider_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncCreateSetEndpoint.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncCreateSetEndpoint.golden
new file mode 100644
index 0000000000..f1f5dffa33
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncCreateSetEndpoint.golden
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.bookshop.v1beta1.samples;
+
+// [START goldensample_generated_bookshopclient_create_setendpoint_sync]
+import com.google.bookshop.v1beta1.BookshopClient;
+import com.google.bookshop.v1beta1.BookshopSettings;
+import com.google.bookshop.v1beta1.myEndpoint;
+
+public class SyncCreateSetEndpoint {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetEndpoint();
+  }
+
+  public static void syncCreateSetEndpoint() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    BookshopSettings bookshopSettings =
+        BookshopSettings.newBuilder().setEndpoint(myEndpoint).build();
+    BookshopClient bookshopClient = BookshopClient.create(bookshopSettings);
+  }
+}
+// [END goldensample_generated_bookshopclient_create_setendpoint_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBook.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBook.golden
new file mode 100644
index 0000000000..8b9a49a334
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBook.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.bookshop.v1beta1.samples;
+
+// [START goldensample_generated_bookshopclient_getbook_sync]
+import com.google.bookshop.v1beta1.Book;
+import com.google.bookshop.v1beta1.BookshopClient;
+import com.google.bookshop.v1beta1.GetBookRequest;
+import java.util.ArrayList;
+
+public class SyncGetBook {
+
+  public static void main(String[] args) throws Exception {
+    syncGetBook();
+  }
+
+  public static void syncGetBook() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (BookshopClient bookshopClient = BookshopClient.create()) {
+      GetBookRequest request =
+          GetBookRequest.newBuilder()
+              .setBooksCount1(1618425911)
+              .setBooksList2("booksList2-1119589686")
+              .addAllBooks3(new ArrayList())
+              .build();
+      Book response = bookshopClient.getBook(request);
+    }
+  }
+}
+// [END goldensample_generated_bookshopclient_getbook_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBookIntListbook.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBookIntListbook.golden
new file mode 100644
index 0000000000..3fcba7a522
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBookIntListbook.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.bookshop.v1beta1.samples;
+
+// [START goldensample_generated_bookshopclient_getbook_intlistbook_sync]
+import com.google.bookshop.v1beta1.Book;
+import com.google.bookshop.v1beta1.BookshopClient;
+import java.util.ArrayList;
+import java.util.List;
+
+public class SyncGetBookIntListbook {
+
+  public static void main(String[] args) throws Exception {
+    syncGetBookIntListbook();
+  }
+
+  public static void syncGetBookIntListbook() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (BookshopClient bookshopClient = BookshopClient.create()) {
+      int booksCount = 1618425911;
+      List books = new ArrayList<>();
+      Book response = bookshopClient.getBook(booksCount, books);
+    }
+  }
+}
+// [END goldensample_generated_bookshopclient_getbook_intlistbook_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBookStringListbook.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBookStringListbook.golden
new file mode 100644
index 0000000000..1cdc59bdfe
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/bookshopclient/SyncGetBookStringListbook.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.bookshop.v1beta1.samples;
+
+// [START goldensample_generated_bookshopclient_getbook_stringlistbook_sync]
+import com.google.bookshop.v1beta1.Book;
+import com.google.bookshop.v1beta1.BookshopClient;
+import java.util.ArrayList;
+import java.util.List;
+
+public class SyncGetBookStringListbook {
+
+  public static void main(String[] args) throws Exception {
+    syncGetBookStringListbook();
+  }
+
+  public static void syncGetBookStringListbook() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (BookshopClient bookshopClient = BookshopClient.create()) {
+      String booksList = "booksList2-1119589686";
+      List books = new ArrayList<>();
+      Book response = bookshopClient.getBook(booksList, books);
+    }
+  }
+}
+// [END goldensample_generated_bookshopclient_getbook_stringlistbook_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/AsyncFastFibonacci.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/AsyncFastFibonacci.golden
new file mode 100644
index 0000000000..4f22840779
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/AsyncFastFibonacci.golden
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.samples;
+
+// [START goldensample_generated_deprecatedserviceclient_fastfibonacci_async]
+import com.google.api.core.ApiFuture;
+import com.google.protobuf.Empty;
+import com.google.testdata.v1.DeprecatedServiceClient;
+import com.google.testdata.v1.FibonacciRequest;
+
+public class AsyncFastFibonacci {
+
+  public static void main(String[] args) throws Exception {
+    asyncFastFibonacci();
+  }
+
+  public static void asyncFastFibonacci() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
+      FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
+      ApiFuture future = deprecatedServiceClient.fastFibonacciCallable().futureCall(request);
+      // Do something.
+      future.get();
+    }
+  }
+}
+// [END goldensample_generated_deprecatedserviceclient_fastfibonacci_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/AsyncSlowFibonacci.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/AsyncSlowFibonacci.golden
new file mode 100644
index 0000000000..f0f6130bf5
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/AsyncSlowFibonacci.golden
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.samples;
+
+// [START goldensample_generated_deprecatedserviceclient_slowfibonacci_async]
+import com.google.api.core.ApiFuture;
+import com.google.protobuf.Empty;
+import com.google.testdata.v1.DeprecatedServiceClient;
+import com.google.testdata.v1.FibonacciRequest;
+
+public class AsyncSlowFibonacci {
+
+  public static void main(String[] args) throws Exception {
+    asyncSlowFibonacci();
+  }
+
+  public static void asyncSlowFibonacci() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
+      FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
+      ApiFuture future = deprecatedServiceClient.slowFibonacciCallable().futureCall(request);
+      // Do something.
+      future.get();
+    }
+  }
+}
+// [END goldensample_generated_deprecatedserviceclient_slowfibonacci_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncCreateSetCredentialsProvider.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncCreateSetCredentialsProvider.golden
new file mode 100644
index 0000000000..c138703b0b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncCreateSetCredentialsProvider.golden
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.samples;
+
+// [START goldensample_generated_deprecatedserviceclient_create_setcredentialsprovider_sync]
+import com.google.api.gax.core.FixedCredentialsProvider;
+import com.google.testdata.v1.DeprecatedServiceClient;
+import com.google.testdata.v1.DeprecatedServiceSettings;
+import com.google.testdata.v1.myCredentials;
+
+public class SyncCreateSetCredentialsProvider {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetCredentialsProvider();
+  }
+
+  public static void syncCreateSetCredentialsProvider() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    DeprecatedServiceSettings deprecatedServiceSettings =
+        DeprecatedServiceSettings.newBuilder()
+            .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
+            .build();
+    DeprecatedServiceClient deprecatedServiceClient =
+        DeprecatedServiceClient.create(deprecatedServiceSettings);
+  }
+}
+// [END goldensample_generated_deprecatedserviceclient_create_setcredentialsprovider_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncCreateSetEndpoint.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncCreateSetEndpoint.golden
new file mode 100644
index 0000000000..a719126c25
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncCreateSetEndpoint.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.samples;
+
+// [START goldensample_generated_deprecatedserviceclient_create_setendpoint_sync]
+import com.google.testdata.v1.DeprecatedServiceClient;
+import com.google.testdata.v1.DeprecatedServiceSettings;
+import com.google.testdata.v1.myEndpoint;
+
+public class SyncCreateSetEndpoint {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetEndpoint();
+  }
+
+  public static void syncCreateSetEndpoint() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    DeprecatedServiceSettings deprecatedServiceSettings =
+        DeprecatedServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
+    DeprecatedServiceClient deprecatedServiceClient =
+        DeprecatedServiceClient.create(deprecatedServiceSettings);
+  }
+}
+// [END goldensample_generated_deprecatedserviceclient_create_setendpoint_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncFastFibonacci.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncFastFibonacci.golden
new file mode 100644
index 0000000000..b2c02d3e7c
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncFastFibonacci.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.samples;
+
+// [START goldensample_generated_deprecatedserviceclient_fastfibonacci_sync]
+import com.google.protobuf.Empty;
+import com.google.testdata.v1.DeprecatedServiceClient;
+import com.google.testdata.v1.FibonacciRequest;
+
+public class SyncFastFibonacci {
+
+  public static void main(String[] args) throws Exception {
+    syncFastFibonacci();
+  }
+
+  public static void syncFastFibonacci() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
+      FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
+      deprecatedServiceClient.fastFibonacci(request);
+    }
+  }
+}
+// [END goldensample_generated_deprecatedserviceclient_fastfibonacci_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncSlowFibonacci.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncSlowFibonacci.golden
new file mode 100644
index 0000000000..8a4e5ac674
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/deprecatedserviceclient/SyncSlowFibonacci.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.samples;
+
+// [START goldensample_generated_deprecatedserviceclient_slowfibonacci_sync]
+import com.google.protobuf.Empty;
+import com.google.testdata.v1.DeprecatedServiceClient;
+import com.google.testdata.v1.FibonacciRequest;
+
+public class SyncSlowFibonacci {
+
+  public static void main(String[] args) throws Exception {
+    syncSlowFibonacci();
+  }
+
+  public static void syncSlowFibonacci() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (DeprecatedServiceClient deprecatedServiceClient = DeprecatedServiceClient.create()) {
+      FibonacciRequest request = FibonacciRequest.newBuilder().setValue(111972721).build();
+      deprecatedServiceClient.slowFibonacci(request);
+    }
+  }
+}
+// [END goldensample_generated_deprecatedserviceclient_slowfibonacci_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncBlock.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncBlock.golden
new file mode 100644
index 0000000000..b186e09e24
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncBlock.golden
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_block_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.BlockRequest;
+import com.google.showcase.v1beta1.BlockResponse;
+import com.google.showcase.v1beta1.EchoClient;
+
+public class AsyncBlock {
+
+  public static void main(String[] args) throws Exception {
+    asyncBlock();
+  }
+
+  public static void asyncBlock() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      BlockRequest request = BlockRequest.newBuilder().build();
+      ApiFuture future = echoClient.blockCallable().futureCall(request);
+      // Do something.
+      BlockResponse response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_block_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncChatAgainStreamBidi.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncChatAgainStreamBidi.golden
new file mode 100644
index 0000000000..d095d155d8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncChatAgainStreamBidi.golden
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_chatagain_streambidi_async]
+import com.google.api.gax.rpc.BidiStream;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.Foobar;
+import com.google.showcase.v1beta1.FoobarName;
+import com.google.showcase.v1beta1.Severity;
+
+public class AsyncChatAgainStreamBidi {
+
+  public static void main(String[] args) throws Exception {
+    asyncChatAgainStreamBidi();
+  }
+
+  public static void asyncChatAgainStreamBidi() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      BidiStream bidiStream = echoClient.chatAgainCallable().call();
+      EchoRequest request =
+          EchoRequest.newBuilder()
+              .setName(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setParent(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setSeverity(Severity.forNumber(0))
+              .setFoobar(Foobar.newBuilder().build())
+              .build();
+      bidiStream.send(request);
+      for (EchoResponse response : bidiStream) {
+        // Do something when a response is received.
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_chatagain_streambidi_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncChatStreamBidi.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncChatStreamBidi.golden
new file mode 100644
index 0000000000..daa0522787
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncChatStreamBidi.golden
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_chat_streambidi_async]
+import com.google.api.gax.rpc.BidiStream;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.Foobar;
+import com.google.showcase.v1beta1.FoobarName;
+import com.google.showcase.v1beta1.Severity;
+
+public class AsyncChatStreamBidi {
+
+  public static void main(String[] args) throws Exception {
+    asyncChatStreamBidi();
+  }
+
+  public static void asyncChatStreamBidi() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      BidiStream bidiStream = echoClient.chatCallable().call();
+      EchoRequest request =
+          EchoRequest.newBuilder()
+              .setName(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setParent(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setSeverity(Severity.forNumber(0))
+              .setFoobar(Foobar.newBuilder().build())
+              .build();
+      bidiStream.send(request);
+      for (EchoResponse response : bidiStream) {
+        // Do something when a response is received.
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_chat_streambidi_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncCollectStreamClient.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncCollectStreamClient.golden
new file mode 100644
index 0000000000..a214ab6662
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncCollectStreamClient.golden
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_collect_streamclient_async]
+import com.google.api.gax.rpc.ApiStreamObserver;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.Foobar;
+import com.google.showcase.v1beta1.FoobarName;
+import com.google.showcase.v1beta1.Severity;
+
+public class AsyncCollectStreamClient {
+
+  public static void main(String[] args) throws Exception {
+    asyncCollectStreamClient();
+  }
+
+  public static void asyncCollectStreamClient() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      ApiStreamObserver responseObserver =
+          new ApiStreamObserver() {
+            @Override
+            public void onNext(EchoResponse response) {
+              // Do something when a response is received.
+            }
+
+            @Override
+            public void onError(Throwable t) {
+              // Add error-handling
+            }
+
+            @Override
+            public void onCompleted() {
+              // Do something when complete.
+            }
+          };
+      ApiStreamObserver requestObserver =
+          echoClient.collect().clientStreamingCall(responseObserver);
+      EchoRequest request =
+          EchoRequest.newBuilder()
+              .setName(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setParent(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setSeverity(Severity.forNumber(0))
+              .setFoobar(Foobar.newBuilder().build())
+              .build();
+      requestObserver.onNext(request);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_collect_streamclient_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncCollideName.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncCollideName.golden
new file mode 100644
index 0000000000..7e85f18fbf
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncCollideName.golden
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_collidename_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.Foobar;
+import com.google.showcase.v1beta1.FoobarName;
+import com.google.showcase.v1beta1.Object;
+import com.google.showcase.v1beta1.Severity;
+
+public class AsyncCollideName {
+
+  public static void main(String[] args) throws Exception {
+    asyncCollideName();
+  }
+
+  public static void asyncCollideName() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      EchoRequest request =
+          EchoRequest.newBuilder()
+              .setName(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setParent(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setSeverity(Severity.forNumber(0))
+              .setFoobar(Foobar.newBuilder().build())
+              .build();
+      ApiFuture future = echoClient.collideNameCallable().futureCall(request);
+      // Do something.
+      Object response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_collidename_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncEcho.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncEcho.golden
new file mode 100644
index 0000000000..859347ff50
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncEcho.golden
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.Foobar;
+import com.google.showcase.v1beta1.FoobarName;
+import com.google.showcase.v1beta1.Severity;
+
+public class AsyncEcho {
+
+  public static void main(String[] args) throws Exception {
+    asyncEcho();
+  }
+
+  public static void asyncEcho() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      EchoRequest request =
+          EchoRequest.newBuilder()
+              .setName(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setParent(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setSeverity(Severity.forNumber(0))
+              .setFoobar(Foobar.newBuilder().build())
+              .build();
+      ApiFuture future = echoClient.echoCallable().futureCall(request);
+      // Do something.
+      EchoResponse response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncExpandStreamServer.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncExpandStreamServer.golden
new file mode 100644
index 0000000000..6a016acb49
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncExpandStreamServer.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_expand_streamserver_async]
+import com.google.api.gax.rpc.ServerStream;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.ExpandRequest;
+
+public class AsyncExpandStreamServer {
+
+  public static void main(String[] args) throws Exception {
+    asyncExpandStreamServer();
+  }
+
+  public static void asyncExpandStreamServer() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      ExpandRequest request =
+          ExpandRequest.newBuilder().setContent("content951530617").setInfo("info3237038").build();
+      ServerStream stream = echoClient.expandCallable().call(request);
+      for (EchoResponse response : stream) {
+        // Do something when a response is received.
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_expand_streamserver_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncPagedExpandPagedCallable.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncPagedExpandPagedCallable.golden
new file mode 100644
index 0000000000..d6afae5452
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncPagedExpandPagedCallable.golden
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_pagedexpand_pagedcallable_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+
+public class AsyncPagedExpandPagedCallable {
+
+  public static void main(String[] args) throws Exception {
+    asyncPagedExpandPagedCallable();
+  }
+
+  public static void asyncPagedExpandPagedCallable() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandRequest request =
+          PagedExpandRequest.newBuilder()
+              .setContent("content951530617")
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      ApiFuture future = echoClient.pagedExpandPagedCallable().futureCall(request);
+      // Do something.
+      for (EchoResponse element : future.get().iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_pagedexpand_pagedcallable_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncSimplePagedExpandPagedCallable.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncSimplePagedExpandPagedCallable.golden
new file mode 100644
index 0000000000..30067b1ca0
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncSimplePagedExpandPagedCallable.golden
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_simplepagedexpand_pagedcallable_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+
+public class AsyncSimplePagedExpandPagedCallable {
+
+  public static void main(String[] args) throws Exception {
+    asyncSimplePagedExpandPagedCallable();
+  }
+
+  public static void asyncSimplePagedExpandPagedCallable() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandRequest request =
+          PagedExpandRequest.newBuilder()
+              .setContent("content951530617")
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      ApiFuture future =
+          echoClient.simplePagedExpandPagedCallable().futureCall(request);
+      // Do something.
+      for (EchoResponse element : future.get().iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_simplepagedexpand_pagedcallable_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncWait.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncWait.golden
new file mode 100644
index 0000000000..6fe7262fcd
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncWait.golden
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_wait_async]
+import com.google.api.core.ApiFuture;
+import com.google.longrunning.Operation;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.WaitRequest;
+
+public class AsyncWait {
+
+  public static void main(String[] args) throws Exception {
+    asyncWait();
+  }
+
+  public static void asyncWait() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      WaitRequest request = WaitRequest.newBuilder().build();
+      ApiFuture future = echoClient.waitCallable().futureCall(request);
+      // Do something.
+      Operation response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_wait_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncWaitOperationCallable.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncWaitOperationCallable.golden
new file mode 100644
index 0000000000..665d3c73a8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncWaitOperationCallable.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_wait_operationcallable_async]
+import com.google.api.gax.longrunning.OperationFuture;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.WaitMetadata;
+import com.google.showcase.v1beta1.WaitRequest;
+import com.google.showcase.v1beta1.WaitResponse;
+
+public class AsyncWaitOperationCallable {
+
+  public static void main(String[] args) throws Exception {
+    asyncWaitOperationCallable();
+  }
+
+  public static void asyncWaitOperationCallable() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      WaitRequest request = WaitRequest.newBuilder().build();
+      OperationFuture future =
+          echoClient.waitOperationCallable().futureCall(request);
+      // Do something.
+      WaitResponse response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_wait_operationcallable_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncBlock.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncBlock.golden
new file mode 100644
index 0000000000..a4f343bf79
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncBlock.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_block_sync]
+import com.google.showcase.v1beta1.BlockRequest;
+import com.google.showcase.v1beta1.BlockResponse;
+import com.google.showcase.v1beta1.EchoClient;
+
+public class SyncBlock {
+
+  public static void main(String[] args) throws Exception {
+    syncBlock();
+  }
+
+  public static void syncBlock() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      BlockRequest request = BlockRequest.newBuilder().build();
+      BlockResponse response = echoClient.block(request);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_block_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCollideName.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCollideName.golden
new file mode 100644
index 0000000000..77bd8ff45a
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCollideName.golden
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_collidename_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.Foobar;
+import com.google.showcase.v1beta1.FoobarName;
+import com.google.showcase.v1beta1.Object;
+import com.google.showcase.v1beta1.Severity;
+
+public class SyncCollideName {
+
+  public static void main(String[] args) throws Exception {
+    syncCollideName();
+  }
+
+  public static void syncCollideName() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      EchoRequest request =
+          EchoRequest.newBuilder()
+              .setName(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setParent(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setSeverity(Severity.forNumber(0))
+              .setFoobar(Foobar.newBuilder().build())
+              .build();
+      Object response = echoClient.collideName(request);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_collidename_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCreateSetCredentialsProvider.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCreateSetCredentialsProvider.golden
new file mode 100644
index 0000000000..b867d8de33
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCreateSetCredentialsProvider.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_create_setcredentialsprovider_sync]
+import com.google.api.gax.core.FixedCredentialsProvider;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoSettings;
+import com.google.showcase.v1beta1.myCredentials;
+
+public class SyncCreateSetCredentialsProvider {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetCredentialsProvider();
+  }
+
+  public static void syncCreateSetCredentialsProvider() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    EchoSettings echoSettings =
+        EchoSettings.newBuilder()
+            .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
+            .build();
+    EchoClient echoClient = EchoClient.create(echoSettings);
+  }
+}
+// [END goldensample_generated_echoclient_create_setcredentialsprovider_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCreateSetEndpoint.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCreateSetEndpoint.golden
new file mode 100644
index 0000000000..046c0083e1
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncCreateSetEndpoint.golden
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_create_setendpoint_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoSettings;
+import com.google.showcase.v1beta1.myEndpoint;
+
+public class SyncCreateSetEndpoint {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetEndpoint();
+  }
+
+  public static void syncCreateSetEndpoint() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    EchoSettings echoSettings = EchoSettings.newBuilder().setEndpoint(myEndpoint).build();
+    EchoClient echoClient = EchoClient.create(echoSettings);
+  }
+}
+// [END goldensample_generated_echoclient_create_setendpoint_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEcho.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEcho.golden
new file mode 100644
index 0000000000..4700422010
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEcho.golden
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+
+public class SyncEcho {
+
+  public static void main(String[] args) throws Exception {
+    syncEcho();
+  }
+
+  public static void syncEcho() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      EchoResponse response = echoClient.echo();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEcho1.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEcho1.golden
new file mode 100644
index 0000000000..20644b2920
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEcho1.golden
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_1_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.Foobar;
+import com.google.showcase.v1beta1.FoobarName;
+import com.google.showcase.v1beta1.Severity;
+
+public class SyncEcho1 {
+
+  public static void main(String[] args) throws Exception {
+    syncEcho1();
+  }
+
+  public static void syncEcho1() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      EchoRequest request =
+          EchoRequest.newBuilder()
+              .setName(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setParent(FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString())
+              .setSeverity(Severity.forNumber(0))
+              .setFoobar(Foobar.newBuilder().build())
+              .build();
+      EchoResponse response = echoClient.echo(request);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_1_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoFoobarname.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoFoobarname.golden
new file mode 100644
index 0000000000..a998ecaa0d
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoFoobarname.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_foobarname_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.FoobarName;
+
+public class SyncEchoFoobarname {
+
+  public static void main(String[] args) throws Exception {
+    syncEchoFoobarname();
+  }
+
+  public static void syncEchoFoobarname() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      FoobarName name = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]");
+      EchoResponse response = echoClient.echo(name);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_foobarname_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoResourcename.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoResourcename.golden
new file mode 100644
index 0000000000..b352a6f215
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoResourcename.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_resourcename_sync]
+import com.google.api.resourcenames.ResourceName;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.FoobarName;
+
+public class SyncEchoResourcename {
+
+  public static void main(String[] args) throws Exception {
+    syncEchoResourcename();
+  }
+
+  public static void syncEchoResourcename() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      ResourceName parent = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]");
+      EchoResponse response = echoClient.echo(parent);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_resourcename_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoStatus.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoStatus.golden
new file mode 100644
index 0000000000..2d1e7fd96e
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoStatus.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_status_sync]
+import com.google.rpc.Status;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+
+public class SyncEchoStatus {
+
+  public static void main(String[] args) throws Exception {
+    syncEchoStatus();
+  }
+
+  public static void syncEchoStatus() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      Status error = Status.newBuilder().build();
+      EchoResponse response = echoClient.echo(error);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_status_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString.golden
new file mode 100644
index 0000000000..8f8737d11a
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString.golden
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_string_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+
+public class SyncEchoString {
+
+  public static void main(String[] args) throws Exception {
+    syncEchoString();
+  }
+
+  public static void syncEchoString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      String content = "content951530617";
+      EchoResponse response = echoClient.echo(content);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString1.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString1.golden
new file mode 100644
index 0000000000..e15958515c
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString1.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_string1_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.FoobarName;
+
+public class SyncEchoString1 {
+
+  public static void main(String[] args) throws Exception {
+    syncEchoString1();
+  }
+
+  public static void syncEchoString1() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      String name = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString();
+      EchoResponse response = echoClient.echo(name);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_string1_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString2.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString2.golden
new file mode 100644
index 0000000000..44d9413448
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoString2.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_string2_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.FoobarName;
+
+public class SyncEchoString2 {
+
+  public static void main(String[] args) throws Exception {
+    syncEchoString2();
+  }
+
+  public static void syncEchoString2() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      String parent = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]").toString();
+      EchoResponse response = echoClient.echo(parent);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_string2_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoStringSeverity.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoStringSeverity.golden
new file mode 100644
index 0000000000..30b06aaba0
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncEchoStringSeverity.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_echo_stringseverity_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.Severity;
+
+public class SyncEchoStringSeverity {
+
+  public static void main(String[] args) throws Exception {
+    syncEchoStringSeverity();
+  }
+
+  public static void syncEchoStringSeverity() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      String content = "content951530617";
+      Severity severity = Severity.forNumber(0);
+      EchoResponse response = echoClient.echo(content, severity);
+    }
+  }
+}
+// [END goldensample_generated_echoclient_echo_stringseverity_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpand.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpand.golden
new file mode 100644
index 0000000000..7f0b48f0f7
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpand.golden
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_pagedexpand_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+
+public class SyncPagedExpand {
+
+  public static void main(String[] args) throws Exception {
+    syncPagedExpand();
+  }
+
+  public static void syncPagedExpand() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandRequest request =
+          PagedExpandRequest.newBuilder()
+              .setContent("content951530617")
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      for (EchoResponse element : echoClient.pagedExpand(request).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_pagedexpand_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpandPaged.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpandPaged.golden
new file mode 100644
index 0000000000..78aae13121
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpandPaged.golden
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_pagedexpand_paged_sync]
+import com.google.common.base.Strings;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandResponse;
+
+public class SyncPagedExpandPaged {
+
+  public static void main(String[] args) throws Exception {
+    syncPagedExpandPaged();
+  }
+
+  public static void syncPagedExpandPaged() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandRequest request =
+          PagedExpandRequest.newBuilder()
+              .setContent("content951530617")
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      while (true) {
+        PagedExpandResponse response = echoClient.pagedExpandCallable().call(request);
+        for (EchoResponse element : response.getResponsesList()) {
+          // doThingsWith(element);
+        }
+        String nextPageToken = response.getNextPageToken();
+        if (!Strings.isNullOrEmpty(nextPageToken)) {
+          request = request.toBuilder().setPageToken(nextPageToken).build();
+        } else {
+          break;
+        }
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_pagedexpand_paged_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpand.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpand.golden
new file mode 100644
index 0000000000..6820c71ba6
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpand.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_simplepagedexpand_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+
+public class SyncSimplePagedExpand {
+
+  public static void main(String[] args) throws Exception {
+    syncSimplePagedExpand();
+  }
+
+  public static void syncSimplePagedExpand() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      for (EchoResponse element : echoClient.simplePagedExpand().iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_simplepagedexpand_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpand1.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpand1.golden
new file mode 100644
index 0000000000..43fd9ef79b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpand1.golden
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_simplepagedexpand_1_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+
+public class SyncSimplePagedExpand1 {
+
+  public static void main(String[] args) throws Exception {
+    syncSimplePagedExpand1();
+  }
+
+  public static void syncSimplePagedExpand1() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandRequest request =
+          PagedExpandRequest.newBuilder()
+              .setContent("content951530617")
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      for (EchoResponse element : echoClient.simplePagedExpand(request).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_simplepagedexpand_1_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpandPaged.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpandPaged.golden
new file mode 100644
index 0000000000..d0eef50d9c
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncSimplePagedExpandPaged.golden
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_simplepagedexpand_paged_sync]
+import com.google.common.base.Strings;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandResponse;
+
+public class SyncSimplePagedExpandPaged {
+
+  public static void main(String[] args) throws Exception {
+    syncSimplePagedExpandPaged();
+  }
+
+  public static void syncSimplePagedExpandPaged() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandRequest request =
+          PagedExpandRequest.newBuilder()
+              .setContent("content951530617")
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      while (true) {
+        PagedExpandResponse response = echoClient.simplePagedExpandCallable().call(request);
+        for (EchoResponse element : response.getResponsesList()) {
+          // doThingsWith(element);
+        }
+        String nextPageToken = response.getNextPageToken();
+        if (!Strings.isNullOrEmpty(nextPageToken)) {
+          request = request.toBuilder().setPageToken(nextPageToken).build();
+        } else {
+          break;
+        }
+      }
+    }
+  }
+}
+// [END goldensample_generated_echoclient_simplepagedexpand_paged_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWait.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWait.golden
new file mode 100644
index 0000000000..3f463f0e69
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWait.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_wait_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.WaitRequest;
+import com.google.showcase.v1beta1.WaitResponse;
+
+public class SyncWait {
+
+  public static void main(String[] args) throws Exception {
+    syncWait();
+  }
+
+  public static void syncWait() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      WaitRequest request = WaitRequest.newBuilder().build();
+      WaitResponse response = echoClient.waitAsync(request).get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_wait_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWaitDuration.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWaitDuration.golden
new file mode 100644
index 0000000000..e9e3c49dce
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWaitDuration.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_wait_duration_sync]
+import com.google.protobuf.Duration;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.WaitResponse;
+
+public class SyncWaitDuration {
+
+  public static void main(String[] args) throws Exception {
+    syncWaitDuration();
+  }
+
+  public static void syncWaitDuration() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      Duration ttl = Duration.newBuilder().build();
+      WaitResponse response = echoClient.waitAsync(ttl).get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_wait_duration_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWaitTimestamp.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWaitTimestamp.golden
new file mode 100644
index 0000000000..f7e5e9dfe5
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncWaitTimestamp.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echoclient_wait_timestamp_sync]
+import com.google.protobuf.Timestamp;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.WaitResponse;
+
+public class SyncWaitTimestamp {
+
+  public static void main(String[] args) throws Exception {
+    syncWaitTimestamp();
+  }
+
+  public static void syncWaitTimestamp() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (EchoClient echoClient = EchoClient.create()) {
+      Timestamp endTime = Timestamp.newBuilder().build();
+      WaitResponse response = echoClient.waitAsync(endTime).get();
+    }
+  }
+}
+// [END goldensample_generated_echoclient_wait_timestamp_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncCreateUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncCreateUser.golden
new file mode 100644
index 0000000000..f5c58710a7
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncCreateUser.golden
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_createuser_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.CreateUserRequest;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class AsyncCreateUser {
+
+  public static void main(String[] args) throws Exception {
+    asyncCreateUser();
+  }
+
+  public static void asyncCreateUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      CreateUserRequest request =
+          CreateUserRequest.newBuilder()
+              .setParent(UserName.of("[USER]").toString())
+              .setUser(User.newBuilder().build())
+              .build();
+      ApiFuture future = identityClient.createUserCallable().futureCall(request);
+      // Do something.
+      User response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_identityclient_createuser_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncDeleteUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncDeleteUser.golden
new file mode 100644
index 0000000000..6ca7457c4d
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncDeleteUser.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_deleteuser_async]
+import com.google.api.core.ApiFuture;
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.DeleteUserRequest;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.UserName;
+
+public class AsyncDeleteUser {
+
+  public static void main(String[] args) throws Exception {
+    asyncDeleteUser();
+  }
+
+  public static void asyncDeleteUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      DeleteUserRequest request =
+          DeleteUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
+      ApiFuture future = identityClient.deleteUserCallable().futureCall(request);
+      // Do something.
+      future.get();
+    }
+  }
+}
+// [END goldensample_generated_identityclient_deleteuser_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncGetUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncGetUser.golden
new file mode 100644
index 0000000000..f3d3e87c1c
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncGetUser.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_getuser_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.GetUserRequest;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class AsyncGetUser {
+
+  public static void main(String[] args) throws Exception {
+    asyncGetUser();
+  }
+
+  public static void asyncGetUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      GetUserRequest request =
+          GetUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
+      ApiFuture future = identityClient.getUserCallable().futureCall(request);
+      // Do something.
+      User response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_identityclient_getuser_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncListUsersPagedCallable.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncListUsersPagedCallable.golden
new file mode 100644
index 0000000000..c6b8ab04e4
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncListUsersPagedCallable.golden
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_listusers_pagedcallable_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.ListUsersRequest;
+import com.google.showcase.v1beta1.User;
+
+public class AsyncListUsersPagedCallable {
+
+  public static void main(String[] args) throws Exception {
+    asyncListUsersPagedCallable();
+  }
+
+  public static void asyncListUsersPagedCallable() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      ListUsersRequest request =
+          ListUsersRequest.newBuilder()
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      ApiFuture future = identityClient.listUsersPagedCallable().futureCall(request);
+      // Do something.
+      for (User element : future.get().iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_identityclient_listusers_pagedcallable_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncUpdateUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncUpdateUser.golden
new file mode 100644
index 0000000000..511e7188ed
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/AsyncUpdateUser.golden
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_updateuser_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.UpdateUserRequest;
+import com.google.showcase.v1beta1.User;
+
+public class AsyncUpdateUser {
+
+  public static void main(String[] args) throws Exception {
+    asyncUpdateUser();
+  }
+
+  public static void asyncUpdateUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      UpdateUserRequest request =
+          UpdateUserRequest.newBuilder().setUser(User.newBuilder().build()).build();
+      ApiFuture future = identityClient.updateUserCallable().futureCall(request);
+      // Do something.
+      User response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_identityclient_updateuser_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateSetCredentialsProvider.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateSetCredentialsProvider.golden
new file mode 100644
index 0000000000..7950320dbb
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateSetCredentialsProvider.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_create_setcredentialsprovider_sync]
+import com.google.api.gax.core.FixedCredentialsProvider;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.IdentitySettings;
+import com.google.showcase.v1beta1.myCredentials;
+
+public class SyncCreateSetCredentialsProvider {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetCredentialsProvider();
+  }
+
+  public static void syncCreateSetCredentialsProvider() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    IdentitySettings identitySettings =
+        IdentitySettings.newBuilder()
+            .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
+            .build();
+    IdentityClient identityClient = IdentityClient.create(identitySettings);
+  }
+}
+// [END goldensample_generated_identityclient_create_setcredentialsprovider_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateSetEndpoint.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateSetEndpoint.golden
new file mode 100644
index 0000000000..b1b7add9db
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateSetEndpoint.golden
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_create_setendpoint_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.IdentitySettings;
+import com.google.showcase.v1beta1.myEndpoint;
+
+public class SyncCreateSetEndpoint {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetEndpoint();
+  }
+
+  public static void syncCreateSetEndpoint() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    IdentitySettings identitySettings =
+        IdentitySettings.newBuilder().setEndpoint(myEndpoint).build();
+    IdentityClient identityClient = IdentityClient.create(identitySettings);
+  }
+}
+// [END goldensample_generated_identityclient_create_setendpoint_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUser.golden
new file mode 100644
index 0000000000..dbd8badb47
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUser.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_createuser_sync]
+import com.google.showcase.v1beta1.CreateUserRequest;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncCreateUser {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateUser();
+  }
+
+  public static void syncCreateUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      CreateUserRequest request =
+          CreateUserRequest.newBuilder()
+              .setParent(UserName.of("[USER]").toString())
+              .setUser(User.newBuilder().build())
+              .build();
+      User response = identityClient.createUser(request);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_createuser_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringString.golden
new file mode 100644
index 0000000000..953dc0706b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringString.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_createuser_stringstringstring_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncCreateUserStringStringString {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateUserStringStringString();
+  }
+
+  public static void syncCreateUserStringStringString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      String parent = UserName.of("[USER]").toString();
+      String displayName = "displayName1714148973";
+      String email = "email96619420";
+      User response = identityClient.createUser(parent, displayName, email);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_createuser_stringstringstring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringStringIntStringBooleanDouble.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringStringIntStringBooleanDouble.golden
new file mode 100644
index 0000000000..85d9ab1960
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringStringIntStringBooleanDouble.golden
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_createuser_stringstringstringintstringbooleandouble_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncCreateUserStringStringStringIntStringBooleanDouble {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateUserStringStringStringIntStringBooleanDouble();
+  }
+
+  public static void syncCreateUserStringStringStringIntStringBooleanDouble() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      String parent = UserName.of("[USER]").toString();
+      String displayName = "displayName1714148973";
+      String email = "email96619420";
+      int age = 96511;
+      String nickname = "nickname70690926";
+      boolean enableNotifications = true;
+      double heightFeet = -1032737338;
+      User response =
+          identityClient.createUser(
+              parent, displayName, email, age, nickname, enableNotifications, heightFeet);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_createuser_stringstringstringintstringbooleandouble_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringStringStringStringIntStringStringStringString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringStringStringStringIntStringStringStringString.golden
new file mode 100644
index 0000000000..d222f048a8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncCreateUserStringStringStringStringStringIntStringStringStringString.golden
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_createuser_stringstringstringstringstringintstringstringstringstring_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncCreateUserStringStringStringStringStringIntStringStringStringString {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateUserStringStringStringStringStringIntStringStringStringString();
+  }
+
+  public static void syncCreateUserStringStringStringStringStringIntStringStringStringString()
+      throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      String parent = UserName.of("[USER]").toString();
+      String displayName = "displayName1714148973";
+      String email = "email96619420";
+      String hobbyName = "hobbyName882586493";
+      String songName = "songName1535136064";
+      int weeklyFrequency = 1572999966;
+      String companyName = "companyName-508582744";
+      String title = "title110371416";
+      String subject = "subject-1867885268";
+      String artistName = "artistName629723762";
+      User response =
+          identityClient.createUser(
+              parent,
+              displayName,
+              email,
+              hobbyName,
+              songName,
+              weeklyFrequency,
+              companyName,
+              title,
+              subject,
+              artistName);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_createuser_stringstringstringstringstringintstringstringstringstring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUser.golden
new file mode 100644
index 0000000000..1c836c26f8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUser.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_deleteuser_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.DeleteUserRequest;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncDeleteUser {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteUser();
+  }
+
+  public static void syncDeleteUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      DeleteUserRequest request =
+          DeleteUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
+      identityClient.deleteUser(request);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_deleteuser_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUserString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUserString.golden
new file mode 100644
index 0000000000..22e00a180f
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUserString.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_deleteuser_string_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncDeleteUserString {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteUserString();
+  }
+
+  public static void syncDeleteUserString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      String name = UserName.of("[USER]").toString();
+      identityClient.deleteUser(name);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_deleteuser_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUserUsername.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUserUsername.golden
new file mode 100644
index 0000000000..55d2b6fb29
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncDeleteUserUsername.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_deleteuser_username_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncDeleteUserUsername {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteUserUsername();
+  }
+
+  public static void syncDeleteUserUsername() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      UserName name = UserName.of("[USER]");
+      identityClient.deleteUser(name);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_deleteuser_username_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUser.golden
new file mode 100644
index 0000000000..972382be7f
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUser.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_getuser_sync]
+import com.google.showcase.v1beta1.GetUserRequest;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncGetUser {
+
+  public static void main(String[] args) throws Exception {
+    syncGetUser();
+  }
+
+  public static void syncGetUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      GetUserRequest request =
+          GetUserRequest.newBuilder().setName(UserName.of("[USER]").toString()).build();
+      User response = identityClient.getUser(request);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_getuser_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUserString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUserString.golden
new file mode 100644
index 0000000000..8ccf1245c0
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUserString.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_getuser_string_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncGetUserString {
+
+  public static void main(String[] args) throws Exception {
+    syncGetUserString();
+  }
+
+  public static void syncGetUserString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      String name = UserName.of("[USER]").toString();
+      User response = identityClient.getUser(name);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_getuser_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUserUsername.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUserUsername.golden
new file mode 100644
index 0000000000..5d7441c7bc
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncGetUserUsername.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_getuser_username_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.User;
+import com.google.showcase.v1beta1.UserName;
+
+public class SyncGetUserUsername {
+
+  public static void main(String[] args) throws Exception {
+    syncGetUserUsername();
+  }
+
+  public static void syncGetUserUsername() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      UserName name = UserName.of("[USER]");
+      User response = identityClient.getUser(name);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_getuser_username_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncListUsers.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncListUsers.golden
new file mode 100644
index 0000000000..e70025e5a2
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncListUsers.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_listusers_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.ListUsersRequest;
+import com.google.showcase.v1beta1.User;
+
+public class SyncListUsers {
+
+  public static void main(String[] args) throws Exception {
+    syncListUsers();
+  }
+
+  public static void syncListUsers() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      ListUsersRequest request =
+          ListUsersRequest.newBuilder()
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      for (User element : identityClient.listUsers(request).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_identityclient_listusers_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncListUsersPaged.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncListUsersPaged.golden
new file mode 100644
index 0000000000..354c02f986
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncListUsersPaged.golden
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_listusers_paged_sync]
+import com.google.common.base.Strings;
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.ListUsersRequest;
+import com.google.showcase.v1beta1.ListUsersResponse;
+import com.google.showcase.v1beta1.User;
+
+public class SyncListUsersPaged {
+
+  public static void main(String[] args) throws Exception {
+    syncListUsersPaged();
+  }
+
+  public static void syncListUsersPaged() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      ListUsersRequest request =
+          ListUsersRequest.newBuilder()
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      while (true) {
+        ListUsersResponse response = identityClient.listUsersCallable().call(request);
+        for (User element : response.getResponsesList()) {
+          // doThingsWith(element);
+        }
+        String nextPageToken = response.getNextPageToken();
+        if (!Strings.isNullOrEmpty(nextPageToken)) {
+          request = request.toBuilder().setPageToken(nextPageToken).build();
+        } else {
+          break;
+        }
+      }
+    }
+  }
+}
+// [END goldensample_generated_identityclient_listusers_paged_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncUpdateUser.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncUpdateUser.golden
new file mode 100644
index 0000000000..32b476711d
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/identityclient/SyncUpdateUser.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_identityclient_updateuser_sync]
+import com.google.showcase.v1beta1.IdentityClient;
+import com.google.showcase.v1beta1.UpdateUserRequest;
+import com.google.showcase.v1beta1.User;
+
+public class SyncUpdateUser {
+
+  public static void main(String[] args) throws Exception {
+    syncUpdateUser();
+  }
+
+  public static void syncUpdateUser() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (IdentityClient identityClient = IdentityClient.create()) {
+      UpdateUserRequest request =
+          UpdateUserRequest.newBuilder().setUser(User.newBuilder().build()).build();
+      User response = identityClient.updateUser(request);
+    }
+  }
+}
+// [END goldensample_generated_identityclient_updateuser_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncConnectStreamBidi.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncConnectStreamBidi.golden
new file mode 100644
index 0000000000..525c4736a7
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncConnectStreamBidi.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_connect_streambidi_async]
+import com.google.api.gax.rpc.BidiStream;
+import com.google.showcase.v1beta1.ConnectRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.StreamBlurbsResponse;
+
+public class AsyncConnectStreamBidi {
+
+  public static void main(String[] args) throws Exception {
+    asyncConnectStreamBidi();
+  }
+
+  public static void asyncConnectStreamBidi() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      BidiStream bidiStream =
+          messagingClient.connectCallable().call();
+      ConnectRequest request = ConnectRequest.newBuilder().build();
+      bidiStream.send(request);
+      for (StreamBlurbsResponse response : bidiStream) {
+        // Do something when a response is received.
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_connect_streambidi_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncCreateBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncCreateBlurb.golden
new file mode 100644
index 0000000000..f3029462c4
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncCreateBlurb.golden
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.CreateBlurbRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class AsyncCreateBlurb {
+
+  public static void main(String[] args) throws Exception {
+    asyncCreateBlurb();
+  }
+
+  public static void asyncCreateBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      CreateBlurbRequest request =
+          CreateBlurbRequest.newBuilder()
+              .setParent(ProfileName.of("[USER]").toString())
+              .setBlurb(Blurb.newBuilder().build())
+              .build();
+      ApiFuture future = messagingClient.createBlurbCallable().futureCall(request);
+      // Do something.
+      Blurb response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncCreateRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncCreateRoom.golden
new file mode 100644
index 0000000000..8d924fe7f8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncCreateRoom.golden
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createroom_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.CreateRoomRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+
+public class AsyncCreateRoom {
+
+  public static void main(String[] args) throws Exception {
+    asyncCreateRoom();
+  }
+
+  public static void asyncCreateRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      CreateRoomRequest request =
+          CreateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
+      ApiFuture future = messagingClient.createRoomCallable().futureCall(request);
+      // Do something.
+      Room response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createroom_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncDeleteBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncDeleteBlurb.golden
new file mode 100644
index 0000000000..21cd62ee46
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncDeleteBlurb.golden
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteblurb_async]
+import com.google.api.core.ApiFuture;
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.DeleteBlurbRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class AsyncDeleteBlurb {
+
+  public static void main(String[] args) throws Exception {
+    asyncDeleteBlurb();
+  }
+
+  public static void asyncDeleteBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      DeleteBlurbRequest request =
+          DeleteBlurbRequest.newBuilder()
+              .setName(
+                  BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]")
+                      .toString())
+              .build();
+      ApiFuture future = messagingClient.deleteBlurbCallable().futureCall(request);
+      // Do something.
+      future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteblurb_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncDeleteRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncDeleteRoom.golden
new file mode 100644
index 0000000000..1e23c521e8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncDeleteRoom.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteroom_async]
+import com.google.api.core.ApiFuture;
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.DeleteRoomRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.RoomName;
+
+public class AsyncDeleteRoom {
+
+  public static void main(String[] args) throws Exception {
+    asyncDeleteRoom();
+  }
+
+  public static void asyncDeleteRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      DeleteRoomRequest request =
+          DeleteRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
+      ApiFuture future = messagingClient.deleteRoomCallable().futureCall(request);
+      // Do something.
+      future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteroom_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncGetBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncGetBlurb.golden
new file mode 100644
index 0000000000..1a2a94c0fe
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncGetBlurb.golden
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getblurb_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.GetBlurbRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class AsyncGetBlurb {
+
+  public static void main(String[] args) throws Exception {
+    asyncGetBlurb();
+  }
+
+  public static void asyncGetBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      GetBlurbRequest request =
+          GetBlurbRequest.newBuilder()
+              .setName(
+                  BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]")
+                      .toString())
+              .build();
+      ApiFuture future = messagingClient.getBlurbCallable().futureCall(request);
+      // Do something.
+      Blurb response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getblurb_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncGetRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncGetRoom.golden
new file mode 100644
index 0000000000..a1a9b7fb06
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncGetRoom.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getroom_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.GetRoomRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+import com.google.showcase.v1beta1.RoomName;
+
+public class AsyncGetRoom {
+
+  public static void main(String[] args) throws Exception {
+    asyncGetRoom();
+  }
+
+  public static void asyncGetRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      GetRoomRequest request =
+          GetRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
+      ApiFuture future = messagingClient.getRoomCallable().futureCall(request);
+      // Do something.
+      Room response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getroom_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncListBlurbsPagedCallable.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncListBlurbsPagedCallable.golden
new file mode 100644
index 0000000000..2e0f9f14cc
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncListBlurbsPagedCallable.golden
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listblurbs_pagedcallable_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.ListBlurbsRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class AsyncListBlurbsPagedCallable {
+
+  public static void main(String[] args) throws Exception {
+    asyncListBlurbsPagedCallable();
+  }
+
+  public static void asyncListBlurbsPagedCallable() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ListBlurbsRequest request =
+          ListBlurbsRequest.newBuilder()
+              .setParent(ProfileName.of("[USER]").toString())
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      ApiFuture future = messagingClient.listBlurbsPagedCallable().futureCall(request);
+      // Do something.
+      for (Blurb element : future.get().iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listblurbs_pagedcallable_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncListRoomsPagedCallable.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncListRoomsPagedCallable.golden
new file mode 100644
index 0000000000..48125e4fc5
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncListRoomsPagedCallable.golden
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listrooms_pagedcallable_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.ListRoomsRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+
+public class AsyncListRoomsPagedCallable {
+
+  public static void main(String[] args) throws Exception {
+    asyncListRoomsPagedCallable();
+  }
+
+  public static void asyncListRoomsPagedCallable() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ListRoomsRequest request =
+          ListRoomsRequest.newBuilder()
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      ApiFuture future = messagingClient.listRoomsPagedCallable().futureCall(request);
+      // Do something.
+      for (Room element : future.get().iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listrooms_pagedcallable_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSearchBlurbs.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSearchBlurbs.golden
new file mode 100644
index 0000000000..55b6198dab
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSearchBlurbs.golden
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_searchblurbs_async]
+import com.google.api.core.ApiFuture;
+import com.google.longrunning.Operation;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+import com.google.showcase.v1beta1.SearchBlurbsRequest;
+
+public class AsyncSearchBlurbs {
+
+  public static void main(String[] args) throws Exception {
+    asyncSearchBlurbs();
+  }
+
+  public static void asyncSearchBlurbs() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      SearchBlurbsRequest request =
+          SearchBlurbsRequest.newBuilder()
+              .setQuery("query107944136")
+              .setParent(ProfileName.of("[USER]").toString())
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      ApiFuture future = messagingClient.searchBlurbsCallable().futureCall(request);
+      // Do something.
+      Operation response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_searchblurbs_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSearchBlurbsOperationCallable.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSearchBlurbsOperationCallable.golden
new file mode 100644
index 0000000000..a6d202c7fb
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSearchBlurbsOperationCallable.golden
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_searchblurbs_operationcallable_async]
+import com.google.api.gax.longrunning.OperationFuture;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+import com.google.showcase.v1beta1.SearchBlurbsMetadata;
+import com.google.showcase.v1beta1.SearchBlurbsRequest;
+import com.google.showcase.v1beta1.SearchBlurbsResponse;
+
+public class AsyncSearchBlurbsOperationCallable {
+
+  public static void main(String[] args) throws Exception {
+    asyncSearchBlurbsOperationCallable();
+  }
+
+  public static void asyncSearchBlurbsOperationCallable() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      SearchBlurbsRequest request =
+          SearchBlurbsRequest.newBuilder()
+              .setQuery("query107944136")
+              .setParent(ProfileName.of("[USER]").toString())
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      OperationFuture future =
+          messagingClient.searchBlurbsOperationCallable().futureCall(request);
+      // Do something.
+      SearchBlurbsResponse response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_searchblurbs_operationcallable_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSendBlurbsStreamClient.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSendBlurbsStreamClient.golden
new file mode 100644
index 0000000000..3b22bb119e
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncSendBlurbsStreamClient.golden
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_sendblurbs_streamclient_async]
+import com.google.api.gax.rpc.ApiStreamObserver;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.CreateBlurbRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+import com.google.showcase.v1beta1.SendBlurbsResponse;
+
+public class AsyncSendBlurbsStreamClient {
+
+  public static void main(String[] args) throws Exception {
+    asyncSendBlurbsStreamClient();
+  }
+
+  public static void asyncSendBlurbsStreamClient() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ApiStreamObserver responseObserver =
+          new ApiStreamObserver() {
+            @Override
+            public void onNext(SendBlurbsResponse response) {
+              // Do something when a response is received.
+            }
+
+            @Override
+            public void onError(Throwable t) {
+              // Add error-handling
+            }
+
+            @Override
+            public void onCompleted() {
+              // Do something when complete.
+            }
+          };
+      ApiStreamObserver requestObserver =
+          messagingClient.sendBlurbs().clientStreamingCall(responseObserver);
+      CreateBlurbRequest request =
+          CreateBlurbRequest.newBuilder()
+              .setParent(ProfileName.of("[USER]").toString())
+              .setBlurb(Blurb.newBuilder().build())
+              .build();
+      requestObserver.onNext(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_sendblurbs_streamclient_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncStreamBlurbsStreamServer.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncStreamBlurbsStreamServer.golden
new file mode 100644
index 0000000000..648fb7a8c8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncStreamBlurbsStreamServer.golden
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_streamblurbs_streamserver_async]
+import com.google.api.gax.rpc.ServerStream;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+import com.google.showcase.v1beta1.StreamBlurbsRequest;
+import com.google.showcase.v1beta1.StreamBlurbsResponse;
+
+public class AsyncStreamBlurbsStreamServer {
+
+  public static void main(String[] args) throws Exception {
+    asyncStreamBlurbsStreamServer();
+  }
+
+  public static void asyncStreamBlurbsStreamServer() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      StreamBlurbsRequest request =
+          StreamBlurbsRequest.newBuilder().setName(ProfileName.of("[USER]").toString()).build();
+      ServerStream stream =
+          messagingClient.streamBlurbsCallable().call(request);
+      for (StreamBlurbsResponse response : stream) {
+        // Do something when a response is received.
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_streamblurbs_streamserver_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncUpdateBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncUpdateBlurb.golden
new file mode 100644
index 0000000000..a3ce5f6f77
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncUpdateBlurb.golden
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_updateblurb_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.UpdateBlurbRequest;
+
+public class AsyncUpdateBlurb {
+
+  public static void main(String[] args) throws Exception {
+    asyncUpdateBlurb();
+  }
+
+  public static void asyncUpdateBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      UpdateBlurbRequest request =
+          UpdateBlurbRequest.newBuilder().setBlurb(Blurb.newBuilder().build()).build();
+      ApiFuture future = messagingClient.updateBlurbCallable().futureCall(request);
+      // Do something.
+      Blurb response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_updateblurb_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncUpdateRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncUpdateRoom.golden
new file mode 100644
index 0000000000..779495250c
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/AsyncUpdateRoom.golden
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_updateroom_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+import com.google.showcase.v1beta1.UpdateRoomRequest;
+
+public class AsyncUpdateRoom {
+
+  public static void main(String[] args) throws Exception {
+    asyncUpdateRoom();
+  }
+
+  public static void asyncUpdateRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      UpdateRoomRequest request =
+          UpdateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
+      ApiFuture future = messagingClient.updateRoomCallable().futureCall(request);
+      // Do something.
+      Room response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_updateroom_async]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurb.golden
new file mode 100644
index 0000000000..bddecdeb46
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurb.golden
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.CreateBlurbRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncCreateBlurb {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateBlurb();
+  }
+
+  public static void syncCreateBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      CreateBlurbRequest request =
+          CreateBlurbRequest.newBuilder()
+              .setParent(ProfileName.of("[USER]").toString())
+              .setBlurb(Blurb.newBuilder().build())
+              .build();
+      Blurb response = messagingClient.createBlurb(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbProfilenameBytestring.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbProfilenameBytestring.golden
new file mode 100644
index 0000000000..7e202c5c41
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbProfilenameBytestring.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_profilenamebytestring_sync]
+import com.google.protobuf.ByteString;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncCreateBlurbProfilenameBytestring {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateBlurbProfilenameBytestring();
+  }
+
+  public static void syncCreateBlurbProfilenameBytestring() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ProfileName parent = ProfileName.of("[USER]");
+      ByteString image = ByteString.EMPTY;
+      Blurb response = messagingClient.createBlurb(parent, image);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_profilenamebytestring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbProfilenameString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbProfilenameString.golden
new file mode 100644
index 0000000000..0dfe1f3abc
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbProfilenameString.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_profilenamestring_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncCreateBlurbProfilenameString {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateBlurbProfilenameString();
+  }
+
+  public static void syncCreateBlurbProfilenameString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ProfileName parent = ProfileName.of("[USER]");
+      String text = "text3556653";
+      Blurb response = messagingClient.createBlurb(parent, text);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_profilenamestring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbRoomnameBytestring.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbRoomnameBytestring.golden
new file mode 100644
index 0000000000..194ee34998
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbRoomnameBytestring.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_roomnamebytestring_sync]
+import com.google.protobuf.ByteString;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncCreateBlurbRoomnameBytestring {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateBlurbRoomnameBytestring();
+  }
+
+  public static void syncCreateBlurbRoomnameBytestring() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      RoomName parent = RoomName.of("[ROOM]");
+      ByteString image = ByteString.EMPTY;
+      Blurb response = messagingClient.createBlurb(parent, image);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_roomnamebytestring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbRoomnameString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbRoomnameString.golden
new file mode 100644
index 0000000000..994d16b1a3
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbRoomnameString.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_roomnamestring_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncCreateBlurbRoomnameString {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateBlurbRoomnameString();
+  }
+
+  public static void syncCreateBlurbRoomnameString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      RoomName parent = RoomName.of("[ROOM]");
+      String text = "text3556653";
+      Blurb response = messagingClient.createBlurb(parent, text);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_roomnamestring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbStringBytestring.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbStringBytestring.golden
new file mode 100644
index 0000000000..0c8f22dca3
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbStringBytestring.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_stringbytestring_sync]
+import com.google.protobuf.ByteString;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncCreateBlurbStringBytestring {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateBlurbStringBytestring();
+  }
+
+  public static void syncCreateBlurbStringBytestring() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String parent = ProfileName.of("[USER]").toString();
+      ByteString image = ByteString.EMPTY;
+      Blurb response = messagingClient.createBlurb(parent, image);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_stringbytestring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbStringString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbStringString.golden
new file mode 100644
index 0000000000..19e8b3e33f
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateBlurbStringString.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createblurb_stringstring_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncCreateBlurbStringString {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateBlurbStringString();
+  }
+
+  public static void syncCreateBlurbStringString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String parent = ProfileName.of("[USER]").toString();
+      String text = "text3556653";
+      Blurb response = messagingClient.createBlurb(parent, text);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createblurb_stringstring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateRoom.golden
new file mode 100644
index 0000000000..6dd645ee49
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateRoom.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createroom_sync]
+import com.google.showcase.v1beta1.CreateRoomRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+
+public class SyncCreateRoom {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateRoom();
+  }
+
+  public static void syncCreateRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      CreateRoomRequest request =
+          CreateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
+      Room response = messagingClient.createRoom(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createroom_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateRoomStringString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateRoomStringString.golden
new file mode 100644
index 0000000000..5d47cfb6e3
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateRoomStringString.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_createroom_stringstring_sync]
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+
+public class SyncCreateRoomStringString {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateRoomStringString();
+  }
+
+  public static void syncCreateRoomStringString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String displayName = "displayName1714148973";
+      String description = "description-1724546052";
+      Room response = messagingClient.createRoom(displayName, description);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_createroom_stringstring_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateSetCredentialsProvider.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateSetCredentialsProvider.golden
new file mode 100644
index 0000000000..4ac54cdfb9
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateSetCredentialsProvider.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_create_setcredentialsprovider_sync]
+import com.google.api.gax.core.FixedCredentialsProvider;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.MessagingSettings;
+import com.google.showcase.v1beta1.myCredentials;
+
+public class SyncCreateSetCredentialsProvider {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetCredentialsProvider();
+  }
+
+  public static void syncCreateSetCredentialsProvider() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    MessagingSettings messagingSettings =
+        MessagingSettings.newBuilder()
+            .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
+            .build();
+    MessagingClient messagingClient = MessagingClient.create(messagingSettings);
+  }
+}
+// [END goldensample_generated_messagingclient_create_setcredentialsprovider_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateSetEndpoint.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateSetEndpoint.golden
new file mode 100644
index 0000000000..45f567766d
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncCreateSetEndpoint.golden
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_create_setendpoint_sync]
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.MessagingSettings;
+import com.google.showcase.v1beta1.myEndpoint;
+
+public class SyncCreateSetEndpoint {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateSetEndpoint();
+  }
+
+  public static void syncCreateSetEndpoint() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    MessagingSettings messagingSettings =
+        MessagingSettings.newBuilder().setEndpoint(myEndpoint).build();
+    MessagingClient messagingClient = MessagingClient.create(messagingSettings);
+  }
+}
+// [END goldensample_generated_messagingclient_create_setendpoint_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurb.golden
new file mode 100644
index 0000000000..abedec6cc9
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurb.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteblurb_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.DeleteBlurbRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class SyncDeleteBlurb {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteBlurb();
+  }
+
+  public static void syncDeleteBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      DeleteBlurbRequest request =
+          DeleteBlurbRequest.newBuilder()
+              .setName(
+                  BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]")
+                      .toString())
+              .build();
+      messagingClient.deleteBlurb(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteblurb_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurbBlurbname.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurbBlurbname.golden
new file mode 100644
index 0000000000..fbab080ec4
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurbBlurbname.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteblurb_blurbname_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class SyncDeleteBlurbBlurbname {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteBlurbBlurbname();
+  }
+
+  public static void syncDeleteBlurbBlurbname() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      BlurbName name = BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]");
+      messagingClient.deleteBlurb(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteblurb_blurbname_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurbString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurbString.golden
new file mode 100644
index 0000000000..4d64e0889e
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteBlurbString.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteblurb_string_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class SyncDeleteBlurbString {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteBlurbString();
+  }
+
+  public static void syncDeleteBlurbString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String name =
+          BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]").toString();
+      messagingClient.deleteBlurb(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteblurb_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoom.golden
new file mode 100644
index 0000000000..76dcad4782
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoom.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteroom_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.DeleteRoomRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncDeleteRoom {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteRoom();
+  }
+
+  public static void syncDeleteRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      DeleteRoomRequest request =
+          DeleteRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
+      messagingClient.deleteRoom(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteroom_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoomRoomname.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoomRoomname.golden
new file mode 100644
index 0000000000..37658c32c6
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoomRoomname.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteroom_roomname_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncDeleteRoomRoomname {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteRoomRoomname();
+  }
+
+  public static void syncDeleteRoomRoomname() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      RoomName name = RoomName.of("[ROOM]");
+      messagingClient.deleteRoom(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteroom_roomname_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoomString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoomString.golden
new file mode 100644
index 0000000000..1e6ede1865
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncDeleteRoomString.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_deleteroom_string_sync]
+import com.google.protobuf.Empty;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncDeleteRoomString {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteRoomString();
+  }
+
+  public static void syncDeleteRoomString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String name = RoomName.of("[ROOM]").toString();
+      messagingClient.deleteRoom(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_deleteroom_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurb.golden
new file mode 100644
index 0000000000..cc1ae967ba
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurb.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getblurb_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.GetBlurbRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class SyncGetBlurb {
+
+  public static void main(String[] args) throws Exception {
+    syncGetBlurb();
+  }
+
+  public static void syncGetBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      GetBlurbRequest request =
+          GetBlurbRequest.newBuilder()
+              .setName(
+                  BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]")
+                      .toString())
+              .build();
+      Blurb response = messagingClient.getBlurb(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getblurb_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurbBlurbname.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurbBlurbname.golden
new file mode 100644
index 0000000000..4696adc0ca
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurbBlurbname.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getblurb_blurbname_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class SyncGetBlurbBlurbname {
+
+  public static void main(String[] args) throws Exception {
+    syncGetBlurbBlurbname();
+  }
+
+  public static void syncGetBlurbBlurbname() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      BlurbName name = BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]");
+      Blurb response = messagingClient.getBlurb(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getblurb_blurbname_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurbString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurbString.golden
new file mode 100644
index 0000000000..e7d8f4cfc3
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetBlurbString.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getblurb_string_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.BlurbName;
+import com.google.showcase.v1beta1.MessagingClient;
+
+public class SyncGetBlurbString {
+
+  public static void main(String[] args) throws Exception {
+    syncGetBlurbString();
+  }
+
+  public static void syncGetBlurbString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String name =
+          BlurbName.ofUserLegacyUserBlurbName("[USER]", "[LEGACY_USER]", "[BLURB]").toString();
+      Blurb response = messagingClient.getBlurb(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getblurb_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoom.golden
new file mode 100644
index 0000000000..41c0ca166f
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoom.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getroom_sync]
+import com.google.showcase.v1beta1.GetRoomRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncGetRoom {
+
+  public static void main(String[] args) throws Exception {
+    syncGetRoom();
+  }
+
+  public static void syncGetRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      GetRoomRequest request =
+          GetRoomRequest.newBuilder().setName(RoomName.of("[ROOM]").toString()).build();
+      Room response = messagingClient.getRoom(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getroom_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoomRoomname.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoomRoomname.golden
new file mode 100644
index 0000000000..f4485469ee
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoomRoomname.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getroom_roomname_sync]
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncGetRoomRoomname {
+
+  public static void main(String[] args) throws Exception {
+    syncGetRoomRoomname();
+  }
+
+  public static void syncGetRoomRoomname() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      RoomName name = RoomName.of("[ROOM]");
+      Room response = messagingClient.getRoom(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getroom_roomname_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoomString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoomString.golden
new file mode 100644
index 0000000000..469e674fcf
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncGetRoomString.golden
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_getroom_string_sync]
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncGetRoomString {
+
+  public static void main(String[] args) throws Exception {
+    syncGetRoomString();
+  }
+
+  public static void syncGetRoomString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String name = RoomName.of("[ROOM]").toString();
+      Room response = messagingClient.getRoom(name);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_getroom_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbs.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbs.golden
new file mode 100644
index 0000000000..be32bec612
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbs.golden
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listblurbs_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.ListBlurbsRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncListBlurbs {
+
+  public static void main(String[] args) throws Exception {
+    syncListBlurbs();
+  }
+
+  public static void syncListBlurbs() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ListBlurbsRequest request =
+          ListBlurbsRequest.newBuilder()
+              .setParent(ProfileName.of("[USER]").toString())
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      for (Blurb element : messagingClient.listBlurbs(request).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listblurbs_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsPaged.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsPaged.golden
new file mode 100644
index 0000000000..c24daf9bfc
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsPaged.golden
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listblurbs_paged_sync]
+import com.google.common.base.Strings;
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.ListBlurbsRequest;
+import com.google.showcase.v1beta1.ListBlurbsResponse;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncListBlurbsPaged {
+
+  public static void main(String[] args) throws Exception {
+    syncListBlurbsPaged();
+  }
+
+  public static void syncListBlurbsPaged() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ListBlurbsRequest request =
+          ListBlurbsRequest.newBuilder()
+              .setParent(ProfileName.of("[USER]").toString())
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      while (true) {
+        ListBlurbsResponse response = messagingClient.listBlurbsCallable().call(request);
+        for (Blurb element : response.getResponsesList()) {
+          // doThingsWith(element);
+        }
+        String nextPageToken = response.getNextPageToken();
+        if (!Strings.isNullOrEmpty(nextPageToken)) {
+          request = request.toBuilder().setPageToken(nextPageToken).build();
+        } else {
+          break;
+        }
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listblurbs_paged_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsProfilename.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsProfilename.golden
new file mode 100644
index 0000000000..9156c3e956
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsProfilename.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listblurbs_profilename_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncListBlurbsProfilename {
+
+  public static void main(String[] args) throws Exception {
+    syncListBlurbsProfilename();
+  }
+
+  public static void syncListBlurbsProfilename() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ProfileName parent = ProfileName.of("[USER]");
+      for (Blurb element : messagingClient.listBlurbs(parent).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listblurbs_profilename_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsRoomname.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsRoomname.golden
new file mode 100644
index 0000000000..1fed75fdfc
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsRoomname.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listblurbs_roomname_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.RoomName;
+
+public class SyncListBlurbsRoomname {
+
+  public static void main(String[] args) throws Exception {
+    syncListBlurbsRoomname();
+  }
+
+  public static void syncListBlurbsRoomname() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      RoomName parent = RoomName.of("[ROOM]");
+      for (Blurb element : messagingClient.listBlurbs(parent).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listblurbs_roomname_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsString.golden
new file mode 100644
index 0000000000..8fe9080264
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListBlurbsString.golden
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listblurbs_string_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+
+public class SyncListBlurbsString {
+
+  public static void main(String[] args) throws Exception {
+    syncListBlurbsString();
+  }
+
+  public static void syncListBlurbsString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String parent = ProfileName.of("[USER]").toString();
+      for (Blurb element : messagingClient.listBlurbs(parent).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listblurbs_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListRooms.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListRooms.golden
new file mode 100644
index 0000000000..f3a8abc711
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListRooms.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listrooms_sync]
+import com.google.showcase.v1beta1.ListRoomsRequest;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+
+public class SyncListRooms {
+
+  public static void main(String[] args) throws Exception {
+    syncListRooms();
+  }
+
+  public static void syncListRooms() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ListRoomsRequest request =
+          ListRoomsRequest.newBuilder()
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      for (Room element : messagingClient.listRooms(request).iterateAll()) {
+        // doThingsWith(element);
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listrooms_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListRoomsPaged.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListRoomsPaged.golden
new file mode 100644
index 0000000000..96bcc331bc
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncListRoomsPaged.golden
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_listrooms_paged_sync]
+import com.google.common.base.Strings;
+import com.google.showcase.v1beta1.ListRoomsRequest;
+import com.google.showcase.v1beta1.ListRoomsResponse;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+
+public class SyncListRoomsPaged {
+
+  public static void main(String[] args) throws Exception {
+    syncListRoomsPaged();
+  }
+
+  public static void syncListRoomsPaged() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      ListRoomsRequest request =
+          ListRoomsRequest.newBuilder()
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      while (true) {
+        ListRoomsResponse response = messagingClient.listRoomsCallable().call(request);
+        for (Room element : response.getResponsesList()) {
+          // doThingsWith(element);
+        }
+        String nextPageToken = response.getNextPageToken();
+        if (!Strings.isNullOrEmpty(nextPageToken)) {
+          request = request.toBuilder().setPageToken(nextPageToken).build();
+        } else {
+          break;
+        }
+      }
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_listrooms_paged_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncSearchBlurbs.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncSearchBlurbs.golden
new file mode 100644
index 0000000000..a52299a511
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncSearchBlurbs.golden
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_searchblurbs_sync]
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.ProfileName;
+import com.google.showcase.v1beta1.SearchBlurbsRequest;
+import com.google.showcase.v1beta1.SearchBlurbsResponse;
+
+public class SyncSearchBlurbs {
+
+  public static void main(String[] args) throws Exception {
+    syncSearchBlurbs();
+  }
+
+  public static void syncSearchBlurbs() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      SearchBlurbsRequest request =
+          SearchBlurbsRequest.newBuilder()
+              .setQuery("query107944136")
+              .setParent(ProfileName.of("[USER]").toString())
+              .setPageSize(883849137)
+              .setPageToken("pageToken873572522")
+              .build();
+      SearchBlurbsResponse response = messagingClient.searchBlurbsAsync(request).get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_searchblurbs_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncSearchBlurbsString.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncSearchBlurbsString.golden
new file mode 100644
index 0000000000..53366c2f0a
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncSearchBlurbsString.golden
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_searchblurbs_string_sync]
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.SearchBlurbsResponse;
+
+public class SyncSearchBlurbsString {
+
+  public static void main(String[] args) throws Exception {
+    syncSearchBlurbsString();
+  }
+
+  public static void syncSearchBlurbsString() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      String query = "query107944136";
+      SearchBlurbsResponse response = messagingClient.searchBlurbsAsync(query).get();
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_searchblurbs_string_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncUpdateBlurb.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncUpdateBlurb.golden
new file mode 100644
index 0000000000..c13e6d97a8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncUpdateBlurb.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_updateblurb_sync]
+import com.google.showcase.v1beta1.Blurb;
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.UpdateBlurbRequest;
+
+public class SyncUpdateBlurb {
+
+  public static void main(String[] args) throws Exception {
+    syncUpdateBlurb();
+  }
+
+  public static void syncUpdateBlurb() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      UpdateBlurbRequest request =
+          UpdateBlurbRequest.newBuilder().setBlurb(Blurb.newBuilder().build()).build();
+      Blurb response = messagingClient.updateBlurb(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_updateblurb_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncUpdateRoom.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncUpdateRoom.golden
new file mode 100644
index 0000000000..66fb9b7c41
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/messagingclient/SyncUpdateRoom.golden
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_messagingclient_updateroom_sync]
+import com.google.showcase.v1beta1.MessagingClient;
+import com.google.showcase.v1beta1.Room;
+import com.google.showcase.v1beta1.UpdateRoomRequest;
+
+public class SyncUpdateRoom {
+
+  public static void main(String[] args) throws Exception {
+    syncUpdateRoom();
+  }
+
+  public static void syncUpdateRoom() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    try (MessagingClient messagingClient = MessagingClient.create()) {
+      UpdateRoomRequest request =
+          UpdateRoomRequest.newBuilder().setRoom(Room.newBuilder().build()).build();
+      Room response = messagingClient.updateRoom(request);
+    }
+  }
+}
+// [END goldensample_generated_messagingclient_updateroom_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/SyncEcho.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/SyncEcho.golden
new file mode 100644
index 0000000000..4b4458d46c
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/SyncEcho.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_echosettings_echo_sync]
+import com.google.showcase.v1beta1.EchoSettings;
+import java.time.Duration;
+
+public class SyncEcho {
+
+  public static void main(String[] args) throws Exception {
+    syncEcho();
+  }
+
+  public static void syncEcho() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    EchoSettings.Builder echoSettingsBuilder = EchoSettings.newBuilder();
+    echoSettingsBuilder
+        .echoSettings()
+        .setRetrySettings(
+            echoSettingsBuilder
+                .echoSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setTotalTimeout(Duration.ofSeconds(30))
+                .build());
+    EchoSettings echoSettings = echoSettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_echosettings_echo_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/SyncFastFibonacci.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/SyncFastFibonacci.golden
new file mode 100644
index 0000000000..60745906df
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/SyncFastFibonacci.golden
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.samples;
+
+// [START goldensample_generated_deprecatedservicesettings_fastfibonacci_sync]
+import com.google.testdata.v1.DeprecatedServiceSettings;
+import java.time.Duration;
+
+public class SyncFastFibonacci {
+
+  public static void main(String[] args) throws Exception {
+    syncFastFibonacci();
+  }
+
+  public static void syncFastFibonacci() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    DeprecatedServiceSettings.Builder deprecatedServiceSettingsBuilder =
+        DeprecatedServiceSettings.newBuilder();
+    deprecatedServiceSettingsBuilder
+        .fastFibonacciSettings()
+        .setRetrySettings(
+            deprecatedServiceSettingsBuilder
+                .fastFibonacciSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setTotalTimeout(Duration.ofSeconds(30))
+                .build());
+    DeprecatedServiceSettings deprecatedServiceSettings = deprecatedServiceSettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_deprecatedservicesettings_fastfibonacci_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncCreateTopic.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncCreateTopic.golden
new file mode 100644
index 0000000000..750f0115f6
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncCreateTopic.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.pubsub.v1.stub.samples;
+
+// [START goldensample_generated_publisherstubsettings_createtopic_sync]
+import com.google.pubsub.v1.stub.PublisherStubSettings;
+import java.time.Duration;
+
+public class SyncCreateTopic {
+
+  public static void main(String[] args) throws Exception {
+    syncCreateTopic();
+  }
+
+  public static void syncCreateTopic() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    PublisherStubSettings.Builder publisherSettingsBuilder = PublisherStubSettings.newBuilder();
+    publisherSettingsBuilder
+        .createTopicSettings()
+        .setRetrySettings(
+            publisherSettingsBuilder
+                .createTopicSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setTotalTimeout(Duration.ofSeconds(30))
+                .build());
+    PublisherStubSettings publisherSettings = publisherSettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_publisherstubsettings_createtopic_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncDeleteLog.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncDeleteLog.golden
new file mode 100644
index 0000000000..b2bdd9b49d
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncDeleteLog.golden
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.logging.v2.stub.samples;
+
+// [START goldensample_generated_loggingservicev2stubsettings_deletelog_sync]
+import com.google.logging.v2.stub.LoggingServiceV2StubSettings;
+import java.time.Duration;
+
+public class SyncDeleteLog {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteLog();
+  }
+
+  public static void syncDeleteLog() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    LoggingServiceV2StubSettings.Builder loggingServiceV2SettingsBuilder =
+        LoggingServiceV2StubSettings.newBuilder();
+    loggingServiceV2SettingsBuilder
+        .deleteLogSettings()
+        .setRetrySettings(
+            loggingServiceV2SettingsBuilder
+                .deleteLogSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setTotalTimeout(Duration.ofSeconds(30))
+                .build());
+    LoggingServiceV2StubSettings loggingServiceV2Settings = loggingServiceV2SettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_loggingservicev2stubsettings_deletelog_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncEcho.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncEcho.golden
new file mode 100644
index 0000000000..fb15d47b6c
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncEcho.golden
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.stub.samples;
+
+// [START goldensample_generated_echostubsettings_echo_sync]
+import com.google.showcase.v1beta1.stub.EchoStubSettings;
+import java.time.Duration;
+
+public class SyncEcho {
+
+  public static void main(String[] args) throws Exception {
+    syncEcho();
+  }
+
+  public static void syncEcho() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    EchoStubSettings.Builder echoSettingsBuilder = EchoStubSettings.newBuilder();
+    echoSettingsBuilder
+        .echoSettings()
+        .setRetrySettings(
+            echoSettingsBuilder
+                .echoSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setTotalTimeout(Duration.ofSeconds(30))
+                .build());
+    EchoStubSettings echoSettings = echoSettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_echostubsettings_echo_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncFastFibonacci.golden b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncFastFibonacci.golden
new file mode 100644
index 0000000000..8a00e1431b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncFastFibonacci.golden
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.testdata.v1.stub.samples;
+
+// [START goldensample_generated_deprecatedservicestubsettings_fastfibonacci_sync]
+import com.google.testdata.v1.stub.DeprecatedServiceStubSettings;
+import java.time.Duration;
+
+public class SyncFastFibonacci {
+
+  public static void main(String[] args) throws Exception {
+    syncFastFibonacci();
+  }
+
+  public static void syncFastFibonacci() throws Exception {
+    // This snippet has been automatically generated for illustrative purposes only.
+    // It may require modifications to work in your environment.
+    DeprecatedServiceStubSettings.Builder deprecatedServiceSettingsBuilder =
+        DeprecatedServiceStubSettings.newBuilder();
+    deprecatedServiceSettingsBuilder
+        .fastFibonacciSettings()
+        .setRetrySettings(
+            deprecatedServiceSettingsBuilder
+                .fastFibonacciSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setTotalTimeout(Duration.ofSeconds(30))
+                .build());
+    DeprecatedServiceStubSettings deprecatedServiceSettings =
+        deprecatedServiceSettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_deprecatedservicestubsettings_fastfibonacci_sync]
diff --git a/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceSettings.golden
index 11af8d46ae..6660e07be5 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceSettings.golden
@@ -34,6 +34,8 @@ import javax.annotation.Generated;
  * 
For example, to set the total timeout of repeatDataBody to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * ComplianceSettings.Builder complianceSettingsBuilder = ComplianceSettings.newBuilder();
  * complianceSettingsBuilder
  *     .repeatDataBodySettings()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceStubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceStubSettings.golden
index fe74c48c98..7fd6d0bc34 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceStubSettings.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceStubSettings.golden
@@ -43,6 +43,8 @@ import javax.annotation.Generated;
  * 
For example, to set the total timeout of repeatDataBody to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * ComplianceStubSettings.Builder complianceSettingsBuilder = ComplianceStubSettings.newBuilder();
  * complianceSettingsBuilder
  *     .repeatDataBodySettings()
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeJavaFormatterTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleBodyJavaFormatterTest.java
similarity index 86%
rename from src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeJavaFormatterTest.java
rename to src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleBodyJavaFormatterTest.java
index 1606c0a440..3947bb5894 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeJavaFormatterTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleBodyJavaFormatterTest.java
@@ -17,16 +17,15 @@
 import static junit.framework.TestCase.assertEquals;
 import static org.junit.Assert.assertThrows;
 
-import com.google.api.generator.gapic.composer.samplecode.SampleCodeJavaFormatter.FormatException;
 import com.google.api.generator.testutils.LineFormatter;
 import org.junit.Test;
 
-public class SampleCodeJavaFormatterTest {
+public class SampleBodyJavaFormatterTest {
 
   @Test
   public void validFormatSampleCode_tryCatchStatement() {
     String samplecode = LineFormatter.lines("try(boolean condition = false){", "int x = 3;", "}");
-    String result = SampleCodeJavaFormatter.format(samplecode);
+    String result = SampleBodyJavaFormatter.format(samplecode);
     String expected =
         LineFormatter.lines("try (boolean condition = false) {\n", "  int x = 3;\n", "}");
     assertEquals(expected, result);
@@ -37,7 +36,7 @@ public void validFormatSampleCode_longLineStatement() {
     String sampleCode =
         "SubscriptionAdminSettings subscriptionAdminSettings = "
             + "SubscriptionAdminSettings.newBuilder().setEndpoint(myEndpoint).build();";
-    String result = SampleCodeJavaFormatter.format(sampleCode);
+    String result = SampleBodyJavaFormatter.format(sampleCode);
     String expected =
         LineFormatter.lines(
             "SubscriptionAdminSettings subscriptionAdminSettings =\n",
@@ -51,7 +50,7 @@ public void validFormatSampleCode_longChainMethod() {
         "echoSettingsBuilder.echoSettings().setRetrySettings("
             + "echoSettingsBuilder.echoSettings().getRetrySettings().toBuilder()"
             + ".setTotalTimeout(Duration.ofSeconds(30)).build());";
-    String result = SampleCodeJavaFormatter.format(sampleCode);
+    String result = SampleBodyJavaFormatter.format(sampleCode);
     String expected =
         LineFormatter.lines(
             "echoSettingsBuilder\n",
@@ -69,9 +68,9 @@ public void validFormatSampleCode_longChainMethod() {
   @Test
   public void invalidFormatSampleCode_nonStatement() {
     assertThrows(
-        FormatException.class,
+        SampleBodyJavaFormatter.FormatException.class,
         () -> {
-          SampleCodeJavaFormatter.format("abc");
+          SampleBodyJavaFormatter.format("abc");
         });
   }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriterTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriterTest.java
index d9456c7dcf..21012be3c5 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriterTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriterTest.java
@@ -14,10 +14,10 @@
 
 package com.google.api.generator.gapic.composer.samplecode;
 
-import static junit.framework.TestCase.assertEquals;
-
 import com.google.api.gax.rpc.ClientSettings;
 import com.google.api.generator.engine.ast.AssignmentExpr;
+import com.google.api.generator.engine.ast.BlockComment;
+import com.google.api.generator.engine.ast.CommentStatement;
 import com.google.api.generator.engine.ast.ConcreteReference;
 import com.google.api.generator.engine.ast.ExprStatement;
 import com.google.api.generator.engine.ast.MethodInvocationExpr;
@@ -28,12 +28,23 @@
 import com.google.api.generator.engine.ast.ValueExpr;
 import com.google.api.generator.engine.ast.Variable;
 import com.google.api.generator.engine.ast.VariableExpr;
+import com.google.api.generator.gapic.model.RegionTag;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.testutils.LineFormatter;
 import java.util.Arrays;
+import java.util.List;
+import org.junit.Assert;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 public class SampleCodeWriterTest {
-  @Test
-  public void writeSampleCode_statements() {
+  private static String packageName = "com.google.samples";
+  private static List testingSampleStatements;
+  private static Sample testingSample;
+  private static RegionTag regionTag;
+
+  @BeforeClass
+  public static void setUp() {
     TypeNode settingType =
         TypeNode.withReference(ConcreteReference.withClazz(ClientSettings.class));
     Variable aVar = Variable.builder().setName("clientSettings").setType(settingType).build();
@@ -53,23 +64,95 @@ public void writeSampleCode_statements() {
             .setVariableExpr(aVarExpr.toBuilder().setIsDecl(true).build())
             .setValueExpr(aValueExpr)
             .build();
-    Statement sampleStatement =
+    TryCatchStatement sampleStatement =
         TryCatchStatement.builder()
             .setTryResourceExpr(createAssignmentExpr("aBool", "false", TypeNode.BOOLEAN))
             .setTryBody(
                 Arrays.asList(ExprStatement.withExpr(createAssignmentExpr("x", "3", TypeNode.INT))))
             .setIsSampleCode(true)
             .build();
-    String result = SampleCodeWriter.write(ExprStatement.withExpr(assignmentExpr), sampleStatement);
+
+    testingSampleStatements =
+        Arrays.asList(ExprStatement.withExpr(assignmentExpr), sampleStatement);
+    regionTag =
+        RegionTag.builder()
+            .setApiShortName("testing")
+            .setApiVersion("v1")
+            .setServiceName("samples")
+            .setRpcName("write")
+            .build();
+    testingSample =
+        Sample.builder()
+            .setFileHeader(
+                Arrays.asList(
+                    CommentStatement.withComment(BlockComment.withComment("Apache License"))))
+            .setBody(testingSampleStatements)
+            .setRegionTag(regionTag)
+            .build();
+  }
+
+  @Test
+  public void writeSampleCodeStatements() {
+    String result = SampleCodeWriter.write(testingSampleStatements);
     String expected =
         "ClientSettings clientSettings = ClientSettings.newBuilder().build();\n"
             + "try (boolean aBool = false) {\n"
             + "  int x = 3;\n"
             + "}";
-    assertEquals(expected, result);
+    Assert.assertEquals(expected, result);
+  }
+
+  @Test
+  public void writeInlineSample() {
+    String result = SampleCodeWriter.writeInlineSample(testingSampleStatements);
+    String expected =
+        LineFormatter.lines(
+            "// This snippet has been automatically generated for illustrative purposes only.\n",
+            "// It may require modifications to work in your environment.\n",
+            "ClientSettings clientSettings = ClientSettings.newBuilder().build();\n",
+            "try (boolean aBool = false) {\n",
+            "  int x = 3;\n",
+            "}");
+    Assert.assertEquals(expected, result);
+  }
+
+  @Test
+  public void writeExecutableSample() {
+    Sample sample =
+        testingSample.withRegionTag(regionTag.withOverloadDisambiguation("ExecutableSample"));
+    String result = SampleCodeWriter.writeExecutableSample(sample, packageName);
+    String expected =
+        LineFormatter.lines(
+            "/*\n",
+            " * Apache License\n",
+            " */\n",
+            "\n",
+            "package com.google.samples;\n",
+            "\n",
+            "// [START testing_v1_generated_samples_write_executablesample_sync]\n",
+            "import com.google.api.gax.rpc.ClientSettings;\n",
+            "\n",
+            "public class SyncWriteExecutableSample {\n",
+            "\n",
+            "  public static void main(String[] args) throws Exception {\n",
+            "    syncWriteExecutableSample();\n",
+            "  }\n",
+            "\n",
+            "  public static void syncWriteExecutableSample() throws Exception {\n",
+            "    // This snippet has been automatically generated for illustrative purposes only.\n",
+            "    // It may require modifications to work in your environment.\n",
+            "    ClientSettings clientSettings = ClientSettings.newBuilder().build();\n",
+            "    try (boolean aBool = false) {\n",
+            "      int x = 3;\n",
+            "    }\n",
+            "  }\n",
+            "}\n",
+            "// [END testing_v1_generated_samples_write_executablesample_sync]\n");
+    Assert.assertEquals(expected, result);
   }
 
-  private AssignmentExpr createAssignmentExpr(String varName, String varValue, TypeNode type) {
+  private static AssignmentExpr createAssignmentExpr(
+      String varName, String varValue, TypeNode type) {
     Variable variable = Variable.builder().setName(varName).setType(type).build();
     VariableExpr variableExpr =
         VariableExpr.builder().setVariable(variable).setIsDecl(true).build();
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleComposerTest.java
new file mode 100644
index 0000000000..d5e895e115
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SampleComposerTest.java
@@ -0,0 +1,295 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import static org.junit.Assert.assertEquals;
+
+import com.google.api.generator.engine.ast.AssignmentExpr;
+import com.google.api.generator.engine.ast.ClassDefinition;
+import com.google.api.generator.engine.ast.Expr;
+import com.google.api.generator.engine.ast.ExprStatement;
+import com.google.api.generator.engine.ast.MethodInvocationExpr;
+import com.google.api.generator.engine.ast.NewObjectExpr;
+import com.google.api.generator.engine.ast.PrimitiveValue;
+import com.google.api.generator.engine.ast.Statement;
+import com.google.api.generator.engine.ast.StringObjectValue;
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.ValueExpr;
+import com.google.api.generator.engine.ast.VaporReference;
+import com.google.api.generator.engine.ast.Variable;
+import com.google.api.generator.engine.ast.VariableExpr;
+import com.google.api.generator.gapic.model.RegionTag;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.testutils.LineFormatter;
+import com.google.common.collect.ImmutableList;
+import java.util.Arrays;
+import java.util.List;
+import org.junit.Test;
+
+public class SampleComposerTest {
+  private final String packageName = "com.google.example";
+  private final RegionTag.Builder regionTag =
+      RegionTag.builder().setApiShortName("apiName").setServiceName("echo");
+
+  @Test
+  public void createInlineSample() {
+    List sampleBody = Arrays.asList(ExprStatement.withExpr(systemOutPrint("testing")));
+    String sampleResult = writeSample(SampleComposer.composeInlineSample(sampleBody));
+    String expected =
+        LineFormatter.lines(
+            "// This snippet has been automatically generated for illustrative purposes only.\n",
+            "// It may require modifications to work in your environment.\n",
+            "System.out.println(\"testing\");");
+
+    assertEquals(expected, sampleResult);
+  }
+
+  @Test
+  public void createExecutableSampleEmptyStatementSample() {
+    Sample sample =
+        Sample.builder()
+            .setRegionTag(
+                regionTag
+                    .setRpcName("createExecutableSample")
+                    .setOverloadDisambiguation("EmptyStatementSample")
+                    .build())
+            .build();
+
+    String sampleResult = writeSample(SampleComposer.composeExecutableSample(sample, packageName));
+    String expected =
+        LineFormatter.lines(
+            "package com.google.example;\n",
+            "\n",
+            "// [START apiname_generated_echo_createexecutablesample_emptystatementsample_sync]\n",
+            "public class SyncCreateExecutableSampleEmptyStatementSample {\n",
+            "\n",
+            "  public static void main(String[] args) throws Exception {\n",
+            "    syncCreateExecutableSampleEmptyStatementSample();\n",
+            "  }\n",
+            "\n",
+            "  public static void syncCreateExecutableSampleEmptyStatementSample() throws Exception {\n",
+            "    // This snippet has been automatically generated for illustrative purposes only.\n",
+            "    // It may require modifications to work in your environment.\n",
+            "  }\n",
+            "}\n",
+            "// [END apiname_generated_echo_createexecutablesample_emptystatementsample_sync]\n");
+
+    assertEquals(expected, sampleResult);
+  }
+
+  @Test
+  public void createExecutableSampleMethodArgsNoVar() {
+    Statement sampleBody =
+        ExprStatement.withExpr(systemOutPrint("Testing CreateExecutableSampleMethodArgsNoVar"));
+    Sample sample =
+        Sample.builder()
+            .setBody(ImmutableList.of(sampleBody))
+            .setRegionTag(
+                regionTag
+                    .setRpcName("createExecutableSample")
+                    .setOverloadDisambiguation("MethodArgsNoVar")
+                    .build())
+            .build();
+
+    String sampleResult = writeSample(SampleComposer.composeExecutableSample(sample, packageName));
+    String expected =
+        LineFormatter.lines(
+            "package com.google.example;\n",
+            "\n",
+            "// [START apiname_generated_echo_createexecutablesample_methodargsnovar_sync]\n",
+            "public class SyncCreateExecutableSampleMethodArgsNoVar {\n",
+            "\n",
+            "  public static void main(String[] args) throws Exception {\n",
+            "    syncCreateExecutableSampleMethodArgsNoVar();\n",
+            "  }\n",
+            "\n",
+            "  public static void syncCreateExecutableSampleMethodArgsNoVar() throws Exception {\n",
+            "    // This snippet has been automatically generated for illustrative purposes only.\n",
+            "    // It may require modifications to work in your environment.\n",
+            "    System.out.println(\"Testing CreateExecutableSampleMethodArgsNoVar\");\n",
+            "  }\n",
+            "}\n",
+            "// [END apiname_generated_echo_createexecutablesample_methodargsnovar_sync]\n");
+
+    assertEquals(expected, sampleResult);
+  }
+
+  @Test
+  public void createExecutableSampleMethod() {
+    VariableExpr variableExpr =
+        VariableExpr.builder()
+            .setVariable(Variable.builder().setType(TypeNode.STRING).setName("content").build())
+            .setIsDecl(true)
+            .build();
+    AssignmentExpr varAssignment =
+        AssignmentExpr.builder()
+            .setVariableExpr(variableExpr)
+            .setValueExpr(
+                ValueExpr.withValue(
+                    StringObjectValue.withValue("Testing CreateExecutableSampleMethod")))
+            .build();
+    Statement sampleBody = ExprStatement.withExpr(systemOutPrint(variableExpr));
+    Sample sample =
+        Sample.builder()
+            .setBody(ImmutableList.of(sampleBody))
+            .setVariableAssignments(ImmutableList.of(varAssignment))
+            .setRegionTag(regionTag.setRpcName("createExecutableSample").build())
+            .build();
+
+    String sampleResult = writeSample(SampleComposer.composeExecutableSample(sample, packageName));
+    String expected =
+        LineFormatter.lines(
+            "package com.google.example;\n",
+            "\n",
+            "// [START apiname_generated_echo_createexecutablesample_sync]\n",
+            "public class SyncCreateExecutableSample {\n",
+            "\n",
+            "  public static void main(String[] args) throws Exception {\n",
+            "    String content = \"Testing CreateExecutableSampleMethod\";\n",
+            "    syncCreateExecutableSample(content);\n",
+            "  }\n",
+            "\n",
+            "  public static void syncCreateExecutableSample(String content) throws Exception {\n",
+            "    // This snippet has been automatically generated for illustrative purposes only.\n",
+            "    // It may require modifications to work in your environment.\n",
+            "    System.out.println(content);\n",
+            "  }\n",
+            "}\n",
+            "// [END apiname_generated_echo_createexecutablesample_sync]\n");
+
+    assertEquals(expected, sampleResult);
+  }
+
+  @Test
+  public void createExecutableSampleMethodMultipleStatements() {
+    VariableExpr strVariableExpr =
+        VariableExpr.builder()
+            .setVariable(Variable.builder().setType(TypeNode.STRING).setName("content").build())
+            .setIsDecl(true)
+            .build();
+    VariableExpr intVariableExpr =
+        VariableExpr.builder()
+            .setVariable(Variable.builder().setType(TypeNode.INT).setName("num").build())
+            .setIsDecl(true)
+            .build();
+    VariableExpr objVariableExpr =
+        VariableExpr.builder()
+            .setVariable(Variable.builder().setType(TypeNode.OBJECT).setName("thing").build())
+            .setIsDecl(true)
+            .build();
+    AssignmentExpr strVarAssignment =
+        AssignmentExpr.builder()
+            .setVariableExpr(strVariableExpr)
+            .setValueExpr(
+                ValueExpr.withValue(
+                    StringObjectValue.withValue(
+                        "Testing CreateExecutableSampleMethodMultipleStatements")))
+            .build();
+    AssignmentExpr intVarAssignment =
+        AssignmentExpr.builder()
+            .setVariableExpr(intVariableExpr)
+            .setValueExpr(
+                ValueExpr.withValue(
+                    PrimitiveValue.builder().setType(TypeNode.INT).setValue("2").build()))
+            .build();
+    AssignmentExpr objVarAssignment =
+        AssignmentExpr.builder()
+            .setVariableExpr(objVariableExpr)
+            .setValueExpr(NewObjectExpr.builder().setType(TypeNode.OBJECT).build())
+            .build();
+
+    Statement strBodyStatement = ExprStatement.withExpr(systemOutPrint(strVariableExpr));
+    Statement intBodyStatement = ExprStatement.withExpr(systemOutPrint(intVariableExpr));
+    Statement objBodyStatement =
+        ExprStatement.withExpr(
+            systemOutPrint(
+                MethodInvocationExpr.builder()
+                    .setExprReferenceExpr(objVariableExpr.toBuilder().setIsDecl(false).build())
+                    .setMethodName("response")
+                    .build()));
+    Sample sample =
+        Sample.builder()
+            .setBody(ImmutableList.of(strBodyStatement, intBodyStatement, objBodyStatement))
+            .setVariableAssignments(
+                ImmutableList.of(strVarAssignment, intVarAssignment, objVarAssignment))
+            .setRegionTag(
+                regionTag
+                    .setRpcName("createExecutableSample")
+                    .setOverloadDisambiguation("MethodMultipleStatements")
+                    .build())
+            .build();
+
+    String sampleResult = writeSample(SampleComposer.composeExecutableSample(sample, packageName));
+    String expected =
+        LineFormatter.lines(
+            "package com.google.example;\n",
+            "\n",
+            "// [START apiname_generated_echo_createexecutablesample_methodmultiplestatements_sync]\n",
+            "public class SyncCreateExecutableSampleMethodMultipleStatements {\n",
+            "\n",
+            "  public static void main(String[] args) throws Exception {\n",
+            "    String content = \"Testing CreateExecutableSampleMethodMultipleStatements\";\n",
+            "    int num = 2;\n",
+            "    Object thing = new Object();\n",
+            "    syncCreateExecutableSampleMethodMultipleStatements(content, num, thing);\n",
+            "  }\n",
+            "\n",
+            "  public static void syncCreateExecutableSampleMethodMultipleStatements(\n",
+            "      String content, int num, Object thing) throws Exception {\n",
+            "    // This snippet has been automatically generated for illustrative purposes only.\n",
+            "    // It may require modifications to work in your environment.\n",
+            "    System.out.println(content);\n",
+            "    System.out.println(num);\n",
+            "    System.out.println(thing.response());\n",
+            "  }\n",
+            "}\n",
+            "// [END apiname_generated_echo_createexecutablesample_methodmultiplestatements_sync]\n");
+    assertEquals(expected, sampleResult);
+  }
+
+  private Expr systemOutPrint(MethodInvocationExpr response) {
+    return composeSystemOutPrint(response);
+  }
+
+  private static MethodInvocationExpr systemOutPrint(String content) {
+    return composeSystemOutPrint(ValueExpr.withValue(StringObjectValue.withValue(content)));
+  }
+
+  private static MethodInvocationExpr systemOutPrint(VariableExpr variableExpr) {
+    return composeSystemOutPrint(variableExpr.toBuilder().setIsDecl(false).build());
+  }
+
+  private static MethodInvocationExpr composeSystemOutPrint(Expr content) {
+    VaporReference out =
+        VaporReference.builder()
+            .setEnclosingClassNames("System")
+            .setName("out")
+            .setPakkage("java.lang")
+            .build();
+    return MethodInvocationExpr.builder()
+        .setStaticReferenceType(TypeNode.withReference(out))
+        .setMethodName("println")
+        .setArguments(content)
+        .build();
+  }
+
+  private static String writeSample(ClassDefinition sample) {
+    return SampleCodeWriter.write(sample);
+  }
+
+  private static String writeSample(List sample) {
+    return SampleCodeWriter.write(sample);
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientCallableMethodSampleComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientCallableMethodSampleComposerTest.java
new file mode 100644
index 0000000000..2199c2f49d
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientCallableMethodSampleComposerTest.java
@@ -0,0 +1,970 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.VaporReference;
+import com.google.api.generator.gapic.model.Field;
+import com.google.api.generator.gapic.model.LongrunningOperation;
+import com.google.api.generator.gapic.model.Message;
+import com.google.api.generator.gapic.model.Method;
+import com.google.api.generator.gapic.model.ResourceName;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.testutils.LineFormatter;
+import com.google.protobuf.Descriptors;
+import com.google.showcase.v1beta1.EchoOuterClass;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Map;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ServiceClientCallableMethodSampleComposerTest {
+  private static final String SHOWCASE_PACKAGE_NAME = "com.google.showcase.v1beta1";
+  private static final String LRO_PACKAGE_NAME = "com.google.longrunning";
+  private static final String PROTO_PACKAGE_NAME = "com.google.protobuf";
+  private static final String PAGINATED_FIELD_NAME = "page_size";
+
+  /*Testing composeLroCallableMethod*/
+  @Test
+  public void valid_composeLroCallableMethod_withReturnResponse() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeLroCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
+            "  OperationFuture future =\n",
+            "      echoClient.waitOperationCallable().futureCall(request);\n",
+            "  // Do something.\n",
+            "  WaitResponse response = future.get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeLroCallableMethod_withReturnVoid() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeLroCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
+            "  OperationFuture future =\n",
+            "      echoClient.waitOperationCallable().futureCall(request);\n",
+            "  // Do something.\n",
+            "  future.get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  /*Testing composePagedCallableMethod*/
+  @Test
+  public void valid_composePagedCallableMethod() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composePagedCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  PagedExpandRequest request =\n",
+            "      PagedExpandRequest.newBuilder()\n",
+            "          .setContent(\"content951530617\")\n",
+            "          .setPageSize(883849137)\n",
+            "          .setPageToken(\"pageToken873572522\")\n",
+            "          .build();\n",
+            "  ApiFuture future ="
+                + " echoClient.pagedExpandPagedCallable().futureCall(request);\n",
+            "  // Do something.\n",
+            "  for (EchoResponse element : future.get().iterateAll()) {\n",
+            "    // doThingsWith(element);\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void invalid_composePagedCallableMethod_inputTypeNotExistInMessage() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NotExistRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composePagedCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void invalid_composePagedCallableMethod_noExistMethodResponse() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NoExistResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composePagedCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void invalid_composePagedCallableMethod_noRepeatedResponse() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NoRepeatedResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Field responseField = Field.builder().setName("response").setType(TypeNode.STRING).build();
+    Message noRepeatedResponseMessage =
+        Message.builder()
+            .setName("NoRepeatedResponse")
+            .setFullProtoName("google.showcase.v1beta1.NoRepeatedResponse")
+            .setType(
+                TypeNode.withReference(
+                    VaporReference.builder()
+                        .setName("NoRepeatedResponse")
+                        .setPakkage(SHOWCASE_PACKAGE_NAME)
+                        .build()))
+            .setFields(Arrays.asList(responseField))
+            .build();
+    messageTypes.put("NoRepeatedResponse", noRepeatedResponseMessage);
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composePagedCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  /*Testing composeStreamCallableMethod*/
+  @Test
+  public void valid_composeStreamCallableMethod_serverStream() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("ExpandRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Expand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Method.Stream.SERVER)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  ExpandRequest request =\n",
+            "      ExpandRequest.newBuilder().setContent(\"content951530617\").setInfo(\"info3237038\").build();\n",
+            "  ServerStream stream = echoClient.expandCallable().call(request);\n",
+            "  for (EchoResponse response : stream) {\n",
+            "    // Do something when a response is received.\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void invalid_composeStreamCallableMethod_serverStreamNotExistRequest() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NotExistRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Expand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Method.Stream.SERVER)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void valid_composeStreamCallableMethod_bidiStream() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("chat")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Method.Stream.BIDI)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  BidiStream bidiStream ="
+                + " echoClient.chatCallable().call();\n",
+            "  EchoRequest request =\n",
+            "      EchoRequest.newBuilder()\n",
+            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setSeverity(Severity.forNumber(0))\n",
+            "          .setFoobar(Foobar.newBuilder().build())\n",
+            "          .build();\n",
+            "  bidiStream.send(request);\n",
+            "  for (EchoResponse response : bidiStream) {\n",
+            "    // Do something when a response is received.\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void invalid_composeStreamCallableMethod_bidiStreamNotExistRequest() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NotExistRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("chat")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Method.Stream.BIDI)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void valid_composeStreamCallableMethod_clientStream() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Collect")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Method.Stream.CLIENT)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  ApiStreamObserver responseObserver =\n",
+            "      new ApiStreamObserver() {\n",
+            "        {@literal @}Override\n",
+            "        public void onNext(EchoResponse response) {\n",
+            "          // Do something when a response is received.\n",
+            "        }\n",
+            "\n",
+            "        {@literal @}Override\n",
+            "        public void onError(Throwable t) {\n",
+            "          // Add error-handling\n",
+            "        }\n",
+            "\n",
+            "        {@literal @}Override\n",
+            "        public void onCompleted() {\n",
+            "          // Do something when complete.\n",
+            "        }\n",
+            "      };\n",
+            "  ApiStreamObserver requestObserver =\n",
+            "      echoClient.collect().clientStreamingCall(responseObserver);\n",
+            "  EchoRequest request =\n",
+            "      EchoRequest.newBuilder()\n",
+            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setSeverity(Severity.forNumber(0))\n",
+            "          .setFoobar(Foobar.newBuilder().build())\n",
+            "          .build();\n",
+            "  requestObserver.onNext(request);\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void invalid_composeStreamCallableMethod_clientStreamNotExistRequest() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NotExistRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Collect")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Method.Stream.CLIENT)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composeStreamCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  /*Testing composeRegularCallableMethod*/
+  @Test
+  public void valid_composeRegularCallableMethod_unaryRpc() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder().setName("Echo").setInputType(inputType).setOutputType(outputType).build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  EchoRequest request =\n",
+            "      EchoRequest.newBuilder()\n",
+            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setSeverity(Severity.forNumber(0))\n",
+            "          .setFoobar(Foobar.newBuilder().build())\n",
+            "          .build();\n",
+            "  ApiFuture future = echoClient.echoCallable().futureCall(request);\n",
+            "  // Do something.\n",
+            "  EchoResponse response = future.get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeRegularCallableMethod_lroRpc() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
+            "  ApiFuture future = echoClient.waitCallable().futureCall(request);\n",
+            "  // Do something.\n",
+            "  Operation response = future.get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeRegularCallableMethod_lroRpcWithReturnVoid() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
+            "  ApiFuture future = echoClient.waitCallable().futureCall(request);\n",
+            "  // Do something.\n",
+            "  future.get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeRegularCallableMethod_pageRpc() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  PagedExpandRequest request =\n",
+            "      PagedExpandRequest.newBuilder()\n",
+            "          .setContent(\"content951530617\")\n",
+            "          .setPageSize(883849137)\n",
+            "          .setPageToken(\"pageToken873572522\")\n",
+            "          .build();\n",
+            "  while (true) {\n",
+            "    PagedExpandResponse response = echoClient.pagedExpandCallable().call(request);\n",
+            "    for (EchoResponse element : response.getResponsesList()) {\n",
+            "      // doThingsWith(element);\n",
+            "    }\n",
+            "    String nextPageToken = response.getNextPageToken();\n",
+            "    if (!Strings.isNullOrEmpty(nextPageToken)) {\n",
+            "      request = request.toBuilder().setPageToken(nextPageToken).build();\n",
+            "    } else {\n",
+            "      break;\n",
+            "    }\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void invalid_composeRegularCallableMethod_noExistMethodRequest() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NoExistRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder().setName("Echo").setInputType(inputType).setOutputType(outputType).build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void invalid_composeRegularCallableMethod_noExistMethodResponsePagedRpc() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NoExistResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void invalid_composeRegularCallableMethod_noRepeatedResponsePagedRpc() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NoRepeatedResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Field responseField = Field.builder().setName("response").setType(TypeNode.STRING).build();
+    Message noRepeatedResponseMessage =
+        Message.builder()
+            .setName("NoRepeatedResponse")
+            .setFullProtoName("google.showcase.v1beta1.NoRepeatedResponse")
+            .setType(
+                TypeNode.withReference(
+                    VaporReference.builder()
+                        .setName("NoRepeatedResponse")
+                        .setPakkage(SHOWCASE_PACKAGE_NAME)
+                        .build()))
+            .setFields(Arrays.asList(responseField))
+            .build();
+    messageTypes.put("NoRepeatedResponse", noRepeatedResponseMessage);
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientCallableMethodSampleComposer.composeRegularCallableMethod(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  private String writeStatements(Sample sample) {
+    return SampleCodeWriter.write(sample.body());
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientHeaderSampleComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientHeaderSampleComposerTest.java
new file mode 100644
index 0000000000..32ab486356
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientHeaderSampleComposerTest.java
@@ -0,0 +1,813 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import com.google.api.generator.engine.ast.ConcreteReference;
+import com.google.api.generator.engine.ast.Reference;
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.VaporReference;
+import com.google.api.generator.gapic.model.Field;
+import com.google.api.generator.gapic.model.LongrunningOperation;
+import com.google.api.generator.gapic.model.Message;
+import com.google.api.generator.gapic.model.Method;
+import com.google.api.generator.gapic.model.MethodArgument;
+import com.google.api.generator.gapic.model.ResourceName;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.gapic.model.Service;
+import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.testutils.LineFormatter;
+import com.google.protobuf.Descriptors;
+import com.google.showcase.v1beta1.EchoOuterClass;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ServiceClientHeaderSampleComposerTest {
+  private static final String SHOWCASE_PACKAGE_NAME = "com.google.showcase.v1beta1";
+  private static final String LRO_PACKAGE_NAME = "com.google.longrunning";
+  private static final String PROTO_PACKAGE_NAME = "com.google.protobuf";
+  private static final String PAGINATED_FIELD_NAME = "page_size";
+
+  /*Testing composeClassHeaderSample*/
+  @Test
+  public void composeClassHeaderSample_unaryRpc() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    Set outputResourceNames = new HashSet<>();
+    List services =
+        Parser.parseService(
+            echoFileDescriptor, messageTypes, resourceNames, Optional.empty(), outputResourceNames);
+    Service echoProtoService = services.get(0);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Sample sample =
+        ServiceClientHeaderSampleComposer.composeClassHeaderSample(
+            echoProtoService, clientType, resourceNames, messageTypes);
+    String results = writeStatements(sample);
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  EchoResponse response = echoClient.echo();\n",
+            "}");
+    Assert.assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeClassHeaderSample_firstMethodIsNotUnaryRpc() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    TypeNode ttlTypeNode =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Duration").setPakkage(PROTO_PACKAGE_NAME).build());
+    MethodArgument ttl =
+        MethodArgument.builder()
+            .setName("ttl")
+            .setType(ttlTypeNode)
+            .setField(
+                Field.builder()
+                    .setName("ttl")
+                    .setType(ttlTypeNode)
+                    .setIsMessage(true)
+                    .setIsContainedInOneof(true)
+                    .build())
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .setMethodSignatures(Arrays.asList(Arrays.asList(ttl)))
+            .build();
+    Service service =
+        Service.builder()
+            .setName("Echo")
+            .setDefaultHost("localhost:7469")
+            .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
+            .setPakkage(SHOWCASE_PACKAGE_NAME)
+            .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
+            .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
+            .setOverriddenName("Echo")
+            .setMethods(Arrays.asList(method))
+            .build();
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeClassHeaderSample(
+                service, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  Duration ttl = Duration.newBuilder().build();\n",
+            "  WaitResponse response = echoClient.waitAsync(ttl).get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void composeClassHeaderSample_firstMethodHasNoSignatures() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Echo")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .build();
+    Service service =
+        Service.builder()
+            .setName("Echo")
+            .setDefaultHost("localhost:7469")
+            .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
+            .setPakkage(SHOWCASE_PACKAGE_NAME)
+            .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
+            .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
+            .setOverriddenName("Echo")
+            .setMethods(Arrays.asList(method))
+            .build();
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeClassHeaderSample(
+                service, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  EchoRequest request =\n",
+            "      EchoRequest.newBuilder()\n",
+            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setSeverity(Severity.forNumber(0))\n",
+            "          .setFoobar(Foobar.newBuilder().build())\n",
+            "          .build();\n",
+            "  EchoResponse response = echoClient.echo(request);\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void composeClassHeaderSample_firstMethodIsStream() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("ExpandRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Expand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Method.Stream.SERVER)
+            .build();
+    Service service =
+        Service.builder()
+            .setName("Echo")
+            .setDefaultHost("localhost:7469")
+            .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
+            .setPakkage(SHOWCASE_PACKAGE_NAME)
+            .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
+            .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
+            .setOverriddenName("Echo")
+            .setMethods(Arrays.asList(method))
+            .build();
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeClassHeaderSample(
+                service, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  ExpandRequest request =\n",
+            "      ExpandRequest.newBuilder().setContent(\"content951530617\").setInfo(\"info3237038\").build();\n",
+            "  ServerStream stream = echoClient.expandCallable().call(request);\n",
+            "  for (EchoResponse response : stream) {\n",
+            "    // Do something when a response is received.\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  /*Testing composeSetCredentialsSample*/
+  @Test
+  public void composeSetCredentialsSample() {
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode settingsType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoSettings")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeSetCredentialsSample(
+                clientType, settingsType));
+    String expected =
+        LineFormatter.lines(
+            "EchoSettings echoSettings =\n",
+            "    EchoSettings.newBuilder()\n",
+            "        .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))\n",
+            "        .build();\n",
+            "EchoClient echoClient = EchoClient.create(echoSettings);");
+    Assert.assertEquals(expected, results);
+  }
+
+  /*Testing composeSetEndpointSample*/
+  @Test
+  public void composeSetEndpointSample() {
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode settingsType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoSettings")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeSetEndpointSample(clientType, settingsType));
+    String expected =
+        LineFormatter.lines(
+            "EchoSettings echoSettings ="
+                + " EchoSettings.newBuilder().setEndpoint(myEndpoint).build();\n",
+            "EchoClient echoClient = EchoClient.create(echoSettings);");
+    Assert.assertEquals(expected, results);
+  }
+
+  /*Testing composeShowcaseMethodSample*/
+  @Test
+  public void valid_composeShowcaseMethodSample_pagedRpcWithMultipleMethodArguments() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("ListContentRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("ListContentResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode resourceNameType =
+        TypeNode.withReference(
+            ConcreteReference.builder()
+                .setClazz(List.class)
+                .setGenerics(ConcreteReference.withClazz(String.class))
+                .build());
+    List arguments =
+        Arrays.asList(
+            MethodArgument.builder()
+                .setName("resourceName")
+                .setType(resourceNameType)
+                .setField(
+                    Field.builder()
+                        .setName("resourceName")
+                        .setType(resourceNameType)
+                        .setIsRepeated(true)
+                        .build())
+                .build(),
+            MethodArgument.builder()
+                .setName("filter")
+                .setType(TypeNode.STRING)
+                .setField(Field.builder().setName("filter").setType(TypeNode.STRING).build())
+                .build());
+    Method method =
+        Method.builder()
+            .setName("ListContent")
+            .setMethodSignatures(Arrays.asList(arguments))
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Reference repeatedResponseReference =
+        VaporReference.builder().setName("Content").setPakkage(SHOWCASE_PACKAGE_NAME).build();
+    Field repeatedField =
+        Field.builder()
+            .setName("responses")
+            .setType(
+                TypeNode.withReference(
+                    ConcreteReference.builder()
+                        .setClazz(List.class)
+                        .setGenerics(repeatedResponseReference)
+                        .build()))
+            .setIsMessage(true)
+            .setIsRepeated(true)
+            .build();
+    Field nextPagedTokenField =
+        Field.builder().setName("next_page_token").setType(TypeNode.STRING).build();
+    Message listContentResponseMessage =
+        Message.builder()
+            .setName("ListContentResponse")
+            .setFullProtoName("google.showcase.v1beta1.ListContentResponse")
+            .setType(outputType)
+            .setFields(Arrays.asList(repeatedField, nextPagedTokenField))
+            .build();
+    messageTypes.put("com.google.showcase.v1beta1.ListContentResponse", listContentResponseMessage);
+
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeShowcaseMethodSample(
+                method, clientType, arguments, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  List resourceName = new ArrayList<>();\n",
+            "  String filter = \"filter-1274492040\";\n",
+            "  for (Content element : echoClient.listContent(resourceName, filter).iterateAll())"
+                + " {\n",
+            "    // doThingsWith(element);\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeShowcaseMethodSample_pagedRpcWithNoMethodArguments() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("ListContentRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("ListContentResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    List arguments = Collections.emptyList();
+    Method method =
+        Method.builder()
+            .setName("ListContent")
+            .setMethodSignatures(Arrays.asList(arguments))
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Reference repeatedResponseReference =
+        VaporReference.builder().setName("Content").setPakkage(SHOWCASE_PACKAGE_NAME).build();
+    Field repeatedField =
+        Field.builder()
+            .setName("responses")
+            .setType(
+                TypeNode.withReference(
+                    ConcreteReference.builder()
+                        .setClazz(List.class)
+                        .setGenerics(repeatedResponseReference)
+                        .build()))
+            .setIsMessage(true)
+            .setIsRepeated(true)
+            .build();
+    Field nextPagedTokenField =
+        Field.builder().setName("next_page_token").setType(TypeNode.STRING).build();
+    Message listContentResponseMessage =
+        Message.builder()
+            .setName("ListContentResponse")
+            .setFullProtoName("google.showcase.v1beta1.ListContentResponse")
+            .setType(outputType)
+            .setFields(Arrays.asList(repeatedField, nextPagedTokenField))
+            .build();
+    messageTypes.put("com.google.showcase.v1beta1.ListContentResponse", listContentResponseMessage);
+
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeShowcaseMethodSample(
+                method, clientType, arguments, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  for (Content element : echoClient.listContent().iterateAll()) {\n",
+            "    // doThingsWith(element);\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void invalid_composeShowcaseMethodSample_noMatchedRepeatedResponseTypeInPagedMethod() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    List methodArguments = Collections.emptyList();
+    Method method =
+        Method.builder()
+            .setName("simplePagedMethod")
+            .setMethodSignatures(Arrays.asList(methodArguments))
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientHeaderSampleComposer.composeShowcaseMethodSample(
+                method, clientType, methodArguments, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void invalid_composeShowcaseMethodSample_noRepeatedResponseTypeInPagedMethod() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    List methodArguments = Collections.emptyList();
+    Method method =
+        Method.builder()
+            .setName("simplePagedMethod")
+            .setMethodSignatures(Arrays.asList(methodArguments))
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Field responseField =
+        Field.builder()
+            .setName("response")
+            .setType(
+                TypeNode.withReference(
+                    ConcreteReference.builder()
+                        .setClazz(List.class)
+                        .setGenerics(ConcreteReference.withClazz(String.class))
+                        .build()))
+            .setIsMessage(true)
+            .setIsRepeated(false)
+            .build();
+    Field nextPageToken =
+        Field.builder().setName("next_page_token").setType(TypeNode.STRING).build();
+    Message noRepeatedFieldMessage =
+        Message.builder()
+            .setName("PagedResponse")
+            .setFullProtoName("google.showcase.v1beta1.PagedResponse")
+            .setType(outputType)
+            .setFields(Arrays.asList(responseField, nextPageToken))
+            .build();
+    messageTypes.put("PagedResponse", noRepeatedFieldMessage);
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientHeaderSampleComposer.composeShowcaseMethodSample(
+                method, clientType, methodArguments, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void valid_composeShowcaseMethodSample_lroUnaryRpcWithNoMethodArgument() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .setMethodSignatures(Collections.emptyList())
+            .build();
+
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeShowcaseMethodSample(
+                method, clientType, Collections.emptyList(), resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  WaitResponse response = echoClient.waitAsync().get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeShowcaseMethodSample_lroRpcWithReturnResponseType() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    TypeNode ttlTypeNode =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Duration").setPakkage(PROTO_PACKAGE_NAME).build());
+    MethodArgument ttl =
+        MethodArgument.builder()
+            .setName("ttl")
+            .setType(ttlTypeNode)
+            .setField(
+                Field.builder()
+                    .setName("ttl")
+                    .setType(ttlTypeNode)
+                    .setIsMessage(true)
+                    .setIsContainedInOneof(true)
+                    .build())
+            .build();
+    List arguments = Arrays.asList(ttl);
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .setMethodSignatures(Arrays.asList(arguments))
+            .build();
+
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeShowcaseMethodSample(
+                method, clientType, arguments, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  Duration ttl = Duration.newBuilder().build();\n",
+            "  WaitResponse response = echoClient.waitAsync(ttl).get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeShowcaseMethodSample_lroRpcWithReturnVoid() {
+    Descriptors.FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    TypeNode ttlTypeNode =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Duration").setPakkage(PROTO_PACKAGE_NAME).build());
+    MethodArgument ttl =
+        MethodArgument.builder()
+            .setName("ttl")
+            .setType(ttlTypeNode)
+            .setField(
+                Field.builder()
+                    .setName("ttl")
+                    .setType(ttlTypeNode)
+                    .setIsMessage(true)
+                    .setIsContainedInOneof(true)
+                    .build())
+            .build();
+    List arguments = Arrays.asList(ttl);
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .setMethodSignatures(Arrays.asList(arguments))
+            .build();
+
+    String results =
+        writeStatements(
+            ServiceClientHeaderSampleComposer.composeShowcaseMethodSample(
+                method, clientType, arguments, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  Duration ttl = Duration.newBuilder().build();\n",
+            "  echoClient.waitAsync(ttl).get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  private String writeStatements(Sample sample) {
+    return SampleCodeWriter.write(sample.body());
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientMethodSampleComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientMethodSampleComposerTest.java
new file mode 100644
index 0000000000..bd6366b11f
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientMethodSampleComposerTest.java
@@ -0,0 +1,343 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer.samplecode;
+
+import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.VaporReference;
+import com.google.api.generator.gapic.model.LongrunningOperation;
+import com.google.api.generator.gapic.model.Message;
+import com.google.api.generator.gapic.model.Method;
+import com.google.api.generator.gapic.model.ResourceName;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.testutils.LineFormatter;
+import com.google.protobuf.Descriptors.FileDescriptor;
+import com.google.showcase.v1beta1.EchoOuterClass;
+import java.util.Collections;
+import java.util.Map;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ServiceClientMethodSampleComposerTest {
+  private static final String SHOWCASE_PACKAGE_NAME = "com.google.showcase.v1beta1";
+  private static final String LRO_PACKAGE_NAME = "com.google.longrunning";
+  private static final String PROTO_PACKAGE_NAME = "com.google.protobuf";
+  private static final String PAGINATED_FIELD_NAME = "page_size";
+
+  @Test
+  public void valid_composeDefaultSample_isPagedMethod() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientMethodSampleComposer.composeCanonicalSample(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  PagedExpandRequest request =\n",
+            "      PagedExpandRequest.newBuilder()\n",
+            "          .setContent(\"content951530617\")\n",
+            "          .setPageSize(883849137)\n",
+            "          .setPageToken(\"pageToken873572522\")\n",
+            "          .build();\n",
+            "  for (EchoResponse element : echoClient.pagedExpand(request).iterateAll()) {\n",
+            "    // doThingsWith(element);\n",
+            "  }\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void invalid_composeDefaultSample_isPagedMethod() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("NotExistRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("PagedExpandResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("PagedExpand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
+            .build();
+    Assert.assertThrows(
+        NullPointerException.class,
+        () ->
+            ServiceClientMethodSampleComposer.composeCanonicalSample(
+                method, clientType, resourceNames, messageTypes));
+  }
+
+  @Test
+  public void valid_composeDefaultSample_hasLroMethodWithReturnResponse() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .setLro(lro)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientMethodSampleComposer.composeCanonicalSample(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
+            "  echoClient.waitAsync(request).get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeDefaultSample_hasLroMethodWithReturnVoid() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro =
+        LongrunningOperation.builder()
+            .setResponseType(responseType)
+            .setMetadataType(metadataType)
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .setLro(lro)
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientMethodSampleComposer.composeCanonicalSample(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
+            "  WaitResponse response = echoClient.waitAsync(request).get();\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeDefaultSample_pureUnaryReturnVoid() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
+    Method method =
+        Method.builder()
+            .setName("Echo")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientMethodSampleComposer.composeCanonicalSample(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  EchoRequest request =\n",
+            "      EchoRequest.newBuilder()\n",
+            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setSeverity(Severity.forNumber(0))\n",
+            "          .setFoobar(Foobar.newBuilder().build())\n",
+            "          .build();\n",
+            "  echoClient.echo(request);\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  @Test
+  public void valid_composeDefaultSample_pureUnaryReturnResponse() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Echo")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .build();
+    String results =
+        writeStatements(
+            ServiceClientMethodSampleComposer.composeCanonicalSample(
+                method, clientType, resourceNames, messageTypes));
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  EchoRequest request =\n",
+            "      EchoRequest.newBuilder()\n",
+            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
+                + " \"[FOOBAR]\").toString())\n",
+            "          .setSeverity(Severity.forNumber(0))\n",
+            "          .setFoobar(Foobar.newBuilder().build())\n",
+            "          .build();\n",
+            "  EchoResponse response = echoClient.echo(request);\n",
+            "}");
+    Assert.assertEquals(results, expected);
+  }
+
+  private String writeStatements(Sample sample) {
+    return SampleCodeWriter.write(sample.body());
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposerTest.java
deleted file mode 100644
index 397e0ec2c2..0000000000
--- a/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposerTest.java
+++ /dev/null
@@ -1,2640 +0,0 @@
-// Copyright 2020 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.api.generator.gapic.composer.samplecode;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThrows;
-
-import com.google.api.generator.engine.ast.ConcreteReference;
-import com.google.api.generator.engine.ast.Reference;
-import com.google.api.generator.engine.ast.TypeNode;
-import com.google.api.generator.engine.ast.VaporReference;
-import com.google.api.generator.gapic.model.Field;
-import com.google.api.generator.gapic.model.LongrunningOperation;
-import com.google.api.generator.gapic.model.Message;
-import com.google.api.generator.gapic.model.Method;
-import com.google.api.generator.gapic.model.Method.Stream;
-import com.google.api.generator.gapic.model.MethodArgument;
-import com.google.api.generator.gapic.model.ResourceName;
-import com.google.api.generator.gapic.model.Service;
-import com.google.api.generator.gapic.protoparser.Parser;
-import com.google.api.generator.testutils.LineFormatter;
-import com.google.protobuf.Descriptors.FileDescriptor;
-import com.google.showcase.v1beta1.EchoOuterClass;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.Set;
-import org.junit.Test;
-
-public class ServiceClientSampleCodeComposerTest {
-  private static final String SHOWCASE_PACKAGE_NAME = "com.google.showcase.v1beta1";
-  private static final String LRO_PACKAGE_NAME = "com.google.longrunning";
-  private static final String PROTO_PACKAGE_NAME = "com.google.protobuf";
-  private static final String PAGINATED_FIELD_NAME = "page_size";
-
-  // =============================== Class Header Sample Code ===============================//
-  @Test
-  public void composeClassHeaderMethodSampleCode_unaryRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    Set outputResourceNames = new HashSet<>();
-    List services =
-        Parser.parseService(
-            echoFileDescriptor, messageTypes, resourceNames, Optional.empty(), outputResourceNames);
-    Service echoProtoService = services.get(0);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    String results =
-        ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
-            echoProtoService, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  EchoResponse response = echoClient.echo();\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void composeClassHeaderMethodSampleCode_firstMethodIsNotUnaryRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    TypeNode ttlTypeNode =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Duration").setPakkage(PROTO_PACKAGE_NAME).build());
-    MethodArgument ttl =
-        MethodArgument.builder()
-            .setName("ttl")
-            .setType(ttlTypeNode)
-            .setField(
-                Field.builder()
-                    .setName("ttl")
-                    .setType(ttlTypeNode)
-                    .setIsMessage(true)
-                    .setIsContainedInOneof(true)
-                    .build())
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .setMethodSignatures(Arrays.asList(Arrays.asList(ttl)))
-            .build();
-    Service service =
-        Service.builder()
-            .setName("Echo")
-            .setDefaultHost("localhost:7469")
-            .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
-            .setPakkage(SHOWCASE_PACKAGE_NAME)
-            .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
-            .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
-            .setOverriddenName("Echo")
-            .setMethods(Arrays.asList(method))
-            .build();
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    String results =
-        ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
-            service, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  Duration ttl = Duration.newBuilder().build();\n",
-            "  WaitResponse response = echoClient.waitAsync(ttl).get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void composeClassHeaderMethodSampleCode_firstMethodHasNoSignatures() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("Echo")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .build();
-    Service service =
-        Service.builder()
-            .setName("Echo")
-            .setDefaultHost("localhost:7469")
-            .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
-            .setPakkage(SHOWCASE_PACKAGE_NAME)
-            .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
-            .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
-            .setOverriddenName("Echo")
-            .setMethods(Arrays.asList(method))
-            .build();
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    String results =
-        ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
-            service, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  EchoRequest request =\n",
-            "      EchoRequest.newBuilder()\n",
-            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setSeverity(Severity.forNumber(0))\n",
-            "          .setFoobar(Foobar.newBuilder().build())\n",
-            "          .build();\n",
-            "  EchoResponse response = echoClient.echo(request);\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void composeClassHeaderMethodSampleCode_firstMethodIsStream() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("ExpandRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("Expand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setStream(Stream.SERVER)
-            .build();
-    Service service =
-        Service.builder()
-            .setName("Echo")
-            .setDefaultHost("localhost:7469")
-            .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
-            .setPakkage(SHOWCASE_PACKAGE_NAME)
-            .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
-            .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
-            .setOverriddenName("Echo")
-            .setMethods(Arrays.asList(method))
-            .build();
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    String results =
-        ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
-            service, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  ExpandRequest request =\n",
-            "     "
-                + " ExpandRequest.newBuilder().setContent(\"content951530617\").setInfo(\"info3237038\").build();\n",
-            "  ServerStream stream = echoClient.expandCallable().call(request);\n",
-            "  for (EchoResponse response : stream) {\n",
-            "    // Do something when a response is received.\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void composeClassHeaderCredentialsSampleCode() {
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode settingsType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoSettings")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    String results =
-        ServiceClientSampleCodeComposer.composeClassHeaderCredentialsSampleCode(
-            clientType, settingsType);
-    String expected =
-        LineFormatter.lines(
-            "EchoSettings echoSettings =\n",
-            "    EchoSettings.newBuilder()\n",
-            "        .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))\n",
-            "        .build();\n",
-            "EchoClient echoClient = EchoClient.create(echoSettings);");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void composeClassHeaderEndpointSampleCode() {
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode settingsType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoSettings")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    String results =
-        ServiceClientSampleCodeComposer.composeClassHeaderEndpointSampleCode(
-            clientType, settingsType);
-    String expected =
-        LineFormatter.lines(
-            "EchoSettings echoSettings ="
-                + " EchoSettings.newBuilder().setEndpoint(myEndpoint).build();\n",
-            "EchoClient echoClient = EchoClient.create(echoSettings);");
-    assertEquals(expected, results);
-  }
-
-  // =======================================Unary RPC Method Sample Code=======================//
-  /*
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pureUnaryRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    List methodArguments = Collections.emptyList();
-    Method method =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(Arrays.asList(methodArguments))
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            method, clientType, methodArguments, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  EchoResponse response = echoClient.echo();\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithResourceNameMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode resourceNameType =
-        TypeNode.withReference(
-            ConcreteReference.withClazz(com.google.api.resourcenames.ResourceName.class));
-    MethodArgument arg =
-        MethodArgument.builder()
-            .setName("parent")
-            .setType(resourceNameType)
-            .setField(
-                Field.builder()
-                    .setName("parent")
-                    .setType(TypeNode.STRING)
-                    .setResourceReference(
-                        ResourceReference.withType("showcase.googleapis.com/AnythingGoes"))
-                    .build())
-            .setIsResourceNameHelper(true)
-            .build();
-    List> signatures = Arrays.asList(Arrays.asList(arg));
-    Method method =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            method, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  ResourceName parent = FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\");\n",
-            "  EchoResponse response = echoClient.echo(parent);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void
-      validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithSuperReferenceIsResourceNameMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode methodArgType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("FoobarName")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .setSupertypeReference(
-                    ConcreteReference.withClazz(com.google.api.resourcenames.ResourceName.class))
-                .build());
-    Field methodArgField =
-        Field.builder()
-            .setName("name")
-            .setType(TypeNode.STRING)
-            .setResourceReference(ResourceReference.withType("showcase.googleapis.com/Foobar"))
-            .build();
-    MethodArgument arg =
-        MethodArgument.builder()
-            .setName("name")
-            .setType(methodArgType)
-            .setField(methodArgField)
-            .setIsResourceNameHelper(true)
-            .build();
-    List> signatures = Arrays.asList(Arrays.asList(arg));
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  FoobarName name = FoobarName.ofProjectFoobarName(\"[PROJECT]\", \"[FOOBAR]\");\n",
-            "  EchoResponse response = echoClient.echo(name);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void
-      validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithStringWithResourceReferenceMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Field methodArgField =
-        Field.builder()
-            .setName("name")
-            .setType(TypeNode.STRING)
-            .setResourceReference(ResourceReference.withType("showcase.googleapis.com/Foobar"))
-            .build();
-    MethodArgument arg =
-        MethodArgument.builder()
-            .setName("name")
-            .setType(TypeNode.STRING)
-            .setField(methodArgField)
-            .build();
-    List> signatures = Arrays.asList(Arrays.asList(arg));
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  String name = FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString();\n",
-            "  EchoResponse response = echoClient.echo(name);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void
-      validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithStringWithParentResourceReferenceMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Field methodArgField =
-        Field.builder()
-            .setName("parent")
-            .setType(TypeNode.STRING)
-            .setResourceReference(
-                ResourceReference.withChildType("showcase.googleapis.com/AnythingGoes"))
-            .build();
-    MethodArgument arg =
-        MethodArgument.builder()
-            .setName("parent")
-            .setType(TypeNode.STRING)
-            .setField(methodArgField)
-            .build();
-    List> signatures = Arrays.asList(Arrays.asList(arg));
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  String parent = FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString();\n",
-            "  EchoResponse response = echoClient.echo(parent);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithIsMessageMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode methodArgType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Status").setPakkage("com.google.rpc").build());
-    Field methodArgField =
-        Field.builder()
-            .setName("error")
-            .setType(methodArgType)
-            .setIsMessage(true)
-            .setIsContainedInOneof(true)
-            .build();
-    MethodArgument arg =
-        MethodArgument.builder()
-            .setName("error")
-            .setType(methodArgType)
-            .setField(methodArgField)
-            .build();
-    List> signatures = Arrays.asList(Arrays.asList(arg));
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  Status error = Status.newBuilder().build();\n",
-            "  EchoResponse response = echoClient.echo(error);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void
-      validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithMultipleWordNameMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Field methodArgField =
-        Field.builder()
-            .setName("display_name")
-            .setType(TypeNode.STRING)
-            .setResourceReference(
-                ResourceReference.withChildType("showcase.googleapis.com/AnythingGoes"))
-            .build();
-    Reference userRef =
-        VaporReference.builder().setName("User").setPakkage(SHOWCASE_PACKAGE_NAME).build();
-    Field nestFiled =
-        Field.builder()
-            .setName("user")
-            .setType(TypeNode.withReference(userRef))
-            .setIsMessage(true)
-            .build();
-    MethodArgument argDisplayName =
-        MethodArgument.builder()
-            .setName("display_name")
-            .setType(TypeNode.STRING)
-            .setField(methodArgField)
-            .setNestedFields(Arrays.asList(nestFiled))
-            .build();
-    MethodArgument argOtherName =
-        MethodArgument.builder()
-            .setName("other_name")
-            .setType(TypeNode.STRING)
-            .setField(Field.builder().setName("other_name").setType(TypeNode.STRING).build())
-            .setNestedFields(Arrays.asList(nestFiled))
-            .build();
-    List> signatures =
-        Arrays.asList(Arrays.asList(argDisplayName, argOtherName));
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  String displayName = FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString();\n",
-            "  String otherName = \"otherName-1946065477\";\n",
-            "  EchoResponse response = echoClient.echo(displayName, otherName);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void
-      validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithStringIsContainedInOneOfMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Field methodArgField =
-        Field.builder()
-            .setName("content")
-            .setType(TypeNode.STRING)
-            .setIsContainedInOneof(true)
-            .build();
-    MethodArgument arg =
-        MethodArgument.builder()
-            .setName("content")
-            .setType(TypeNode.STRING)
-            .setField(methodArgField)
-            .build();
-    List> signatures = Arrays.asList(Arrays.asList(arg));
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  String content = \"content951530617\";\n",
-            "  EchoResponse response = echoClient.echo(content);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithMultipleMethodArguments() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    MethodArgument arg1 =
-        MethodArgument.builder()
-            .setName("content")
-            .setType(TypeNode.STRING)
-            .setField(Field.builder().setName("content").setType(TypeNode.STRING).build())
-            .build();
-    TypeNode severityType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Severity").setPakkage(SHOWCASE_PACKAGE_NAME).build());
-    MethodArgument arg2 =
-        MethodArgument.builder()
-            .setName("severity")
-            .setType(severityType)
-            .setField(
-                Field.builder().setName("severity").setType(severityType).setIsEnum(true).build())
-            .build();
-    List> signatures = Arrays.asList(Arrays.asList(arg1, arg2));
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  String content = \"content951530617\";\n",
-            "  Severity severity = Severity.forNumber(0);\n",
-            "  EchoResponse response = echoClient.echo(content, severity);\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithNoMethodArguments() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    List> signatures = Arrays.asList(Collections.emptyList());
-    Method unaryMethod =
-        Method.builder()
-            .setName("echo")
-            .setMethodSignatures(signatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, signatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  EchoResponse response = echoClient.echo();\n",
-            "}");
-    assertEquals(expected, results);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pureUnaryRpcWithMethodReturnVoid() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("DeleteUserRequest")
-                .setPakkage("com.google.showcase.v1beta1")
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
-    List> methodSignatures =
-        Arrays.asList(
-            Arrays.asList(
-                MethodArgument.builder()
-                    .setName("name")
-                    .setType(TypeNode.STRING)
-                    .setField(Field.builder().setName("name").setType(TypeNode.STRING).build())
-                    .build()));
-    Method unaryMethod =
-        Method.builder()
-            .setName("delete")
-            .setMethodSignatures(methodSignatures)
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            unaryMethod, clientType, methodSignatures.get(0), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  String name = \"name3373707\";\n",
-            "  echoClient.delete(name);\n",
-            "}");
-    assertEquals(results, expected);
-  }
-  */
-
-  // ===================================Unary Paged RPC Method Sample Code ======================//
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pagedRpcWithMultipleMethodArguments() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("ListContentRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("ListContentResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode resourceNameType =
-        TypeNode.withReference(
-            ConcreteReference.builder()
-                .setClazz(List.class)
-                .setGenerics(ConcreteReference.withClazz(String.class))
-                .build());
-    List arguments =
-        Arrays.asList(
-            MethodArgument.builder()
-                .setName("resourceName")
-                .setType(resourceNameType)
-                .setField(
-                    Field.builder()
-                        .setName("resourceName")
-                        .setType(resourceNameType)
-                        .setIsRepeated(true)
-                        .build())
-                .build(),
-            MethodArgument.builder()
-                .setName("filter")
-                .setType(TypeNode.STRING)
-                .setField(Field.builder().setName("filter").setType(TypeNode.STRING).build())
-                .build());
-    Method method =
-        Method.builder()
-            .setName("ListContent")
-            .setMethodSignatures(Arrays.asList(arguments))
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    Reference repeatedResponseReference =
-        VaporReference.builder().setName("Content").setPakkage(SHOWCASE_PACKAGE_NAME).build();
-    Field repeatedField =
-        Field.builder()
-            .setName("responses")
-            .setType(
-                TypeNode.withReference(
-                    ConcreteReference.builder()
-                        .setClazz(List.class)
-                        .setGenerics(repeatedResponseReference)
-                        .build()))
-            .setIsMessage(true)
-            .setIsRepeated(true)
-            .build();
-    Field nextPagedTokenField =
-        Field.builder().setName("next_page_token").setType(TypeNode.STRING).build();
-    Message listContentResponseMessage =
-        Message.builder()
-            .setName("ListContentResponse")
-            .setFullProtoName("google.showcase.v1beta1.ListContentResponse")
-            .setType(outputType)
-            .setFields(Arrays.asList(repeatedField, nextPagedTokenField))
-            .build();
-    messageTypes.put("com.google.showcase.v1beta1.ListContentResponse", listContentResponseMessage);
-
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            method, clientType, arguments, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  List resourceName = new ArrayList<>();\n",
-            "  String filter = \"filter-1274492040\";\n",
-            "  for (Content element : echoClient.listContent(resourceName, filter).iterateAll())"
-                + " {\n",
-            "    // doThingsWith(element);\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_pagedRpcWithNoMethodArguments() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("ListContentRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("ListContentResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    List arguments = Collections.emptyList();
-    Method method =
-        Method.builder()
-            .setName("ListContent")
-            .setMethodSignatures(Arrays.asList(arguments))
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    Reference repeatedResponseReference =
-        VaporReference.builder().setName("Content").setPakkage(SHOWCASE_PACKAGE_NAME).build();
-    Field repeatedField =
-        Field.builder()
-            .setName("responses")
-            .setType(
-                TypeNode.withReference(
-                    ConcreteReference.builder()
-                        .setClazz(List.class)
-                        .setGenerics(repeatedResponseReference)
-                        .build()))
-            .setIsMessage(true)
-            .setIsRepeated(true)
-            .build();
-    Field nextPagedTokenField =
-        Field.builder().setName("next_page_token").setType(TypeNode.STRING).build();
-    Message listContentResponseMessage =
-        Message.builder()
-            .setName("ListContentResponse")
-            .setFullProtoName("google.showcase.v1beta1.ListContentResponse")
-            .setType(outputType)
-            .setFields(Arrays.asList(repeatedField, nextPagedTokenField))
-            .build();
-    messageTypes.put("com.google.showcase.v1beta1.ListContentResponse", listContentResponseMessage);
-
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            method, clientType, arguments, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  for (Content element : echoClient.listContent().iterateAll()) {\n",
-            "    // doThingsWith(element);\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void invalidComposeRpcMethodHeaderSampleCode_noMatchedRepeatedResponseTypeInPagedMethod() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    List methodArguments = Collections.emptyList();
-    Method method =
-        Method.builder()
-            .setName("simplePagedMethod")
-            .setMethodSignatures(Arrays.asList(methodArguments))
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-                method, clientType, methodArguments, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void invalidComposeRpcMethodHeaderSampleCode_noRepeatedResponseTypeInPagedMethod() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    List methodArguments = Collections.emptyList();
-    Method method =
-        Method.builder()
-            .setName("simplePagedMethod")
-            .setMethodSignatures(Arrays.asList(methodArguments))
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    Field responseField =
-        Field.builder()
-            .setName("response")
-            .setType(
-                TypeNode.withReference(
-                    ConcreteReference.builder()
-                        .setClazz(List.class)
-                        .setGenerics(ConcreteReference.withClazz(String.class))
-                        .build()))
-            .setIsMessage(true)
-            .setIsRepeated(false)
-            .build();
-    Field nextPageToken =
-        Field.builder().setName("next_page_token").setType(TypeNode.STRING).build();
-    Message noRepeatedFieldMessage =
-        Message.builder()
-            .setName("PagedResponse")
-            .setFullProtoName("google.showcase.v1beta1.PagedResponse")
-            .setType(outputType)
-            .setFields(Arrays.asList(responseField, nextPageToken))
-            .build();
-    messageTypes.put("PagedResponse", noRepeatedFieldMessage);
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-                method, clientType, methodArguments, resourceNames, messageTypes));
-  }
-
-  // ===================================Unary LRO RPC Method Sample Code ======================//
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_lroUnaryRpcWithNoMethodArgument() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .setMethodSignatures(Collections.emptyList())
-            .build();
-
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            method, clientType, Collections.emptyList(), resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  WaitResponse response = echoClient.waitAsync().get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_lroRpcWithReturnResponseType() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    TypeNode ttlTypeNode =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Duration").setPakkage(PROTO_PACKAGE_NAME).build());
-    MethodArgument ttl =
-        MethodArgument.builder()
-            .setName("ttl")
-            .setType(ttlTypeNode)
-            .setField(
-                Field.builder()
-                    .setName("ttl")
-                    .setType(ttlTypeNode)
-                    .setIsMessage(true)
-                    .setIsContainedInOneof(true)
-                    .build())
-            .build();
-    List arguments = Arrays.asList(ttl);
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .setMethodSignatures(Arrays.asList(arguments))
-            .build();
-
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            method, clientType, arguments, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  Duration ttl = Duration.newBuilder().build();\n",
-            "  WaitResponse response = echoClient.waitAsync(ttl).get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRpcMethodHeaderSampleCode_lroRpcWithReturnVoid() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    TypeNode ttlTypeNode =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Duration").setPakkage(PROTO_PACKAGE_NAME).build());
-    MethodArgument ttl =
-        MethodArgument.builder()
-            .setName("ttl")
-            .setType(ttlTypeNode)
-            .setField(
-                Field.builder()
-                    .setName("ttl")
-                    .setType(ttlTypeNode)
-                    .setIsMessage(true)
-                    .setIsContainedInOneof(true)
-                    .build())
-            .build();
-    List arguments = Arrays.asList(ttl);
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .setMethodSignatures(Arrays.asList(arguments))
-            .build();
-
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
-            method, clientType, arguments, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  Duration ttl = Duration.newBuilder().build();\n",
-            "  echoClient.waitAsync(ttl).get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  // ================================Unary RPC Default Method Sample Code ====================//
-  @Test
-  public void validComposeRpcDefaultMethodHeaderSampleCode_isPagedMethod() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  PagedExpandRequest request =\n",
-            "      PagedExpandRequest.newBuilder()\n",
-            "          .setContent(\"content951530617\")\n",
-            "          .setPageSize(883849137)\n",
-            "          .setPageToken(\"pageToken873572522\")\n",
-            "          .build();\n",
-            "  for (EchoResponse element : echoClient.pagedExpand(request).iterateAll()) {\n",
-            "    // doThingsWith(element);\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void invalidComposeRpcDefaultMethodHeaderSampleCode_isPagedMethod() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NotExistRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void validComposeRpcDefaultMethodHeaderSampleCode_hasLroMethodWithReturnResponse() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .setLro(lro)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
-            "  echoClient.waitAsync(request).get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRpcDefaultMethodHeaderSampleCode_hasLroMethodWithReturnVoid() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .setLro(lro)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
-            "  WaitResponse response = echoClient.waitAsync(request).get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRpcDefaultMethodHeaderSampleCode_pureUnaryReturnVoid() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
-    Method method =
-        Method.builder()
-            .setName("Echo")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  EchoRequest request =\n",
-            "      EchoRequest.newBuilder()\n",
-            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setSeverity(Severity.forNumber(0))\n",
-            "          .setFoobar(Foobar.newBuilder().build())\n",
-            "          .build();\n",
-            "  echoClient.echo(request);\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRpcDefaultMethodHeaderSampleCode_pureUnaryReturnResponse() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("Echo")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  EchoRequest request =\n",
-            "      EchoRequest.newBuilder()\n",
-            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setSeverity(Severity.forNumber(0))\n",
-            "          .setFoobar(Foobar.newBuilder().build())\n",
-            "          .build();\n",
-            "  EchoResponse response = echoClient.echo(request);\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  // ================================LRO Callable Method Sample Code ====================//
-  @Test
-  public void validComposeLroCallableMethodHeaderSampleCode_withReturnResponse() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeLroCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
-            "  OperationFuture future =\n",
-            "      echoClient.waitOperationCallable().futureCall(request);\n",
-            "  // Do something.\n",
-            "  WaitResponse response = future.get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeLroCallableMethodHeaderSampleCode_withReturnVoid() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeLroCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
-            "  OperationFuture future =\n",
-            "      echoClient.waitOperationCallable().futureCall(request);\n",
-            "  // Do something.\n",
-            "  future.get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  // ================================Paged Callable Method Sample Code ====================//
-  @Test
-  public void validComposePagedCallableMethodHeaderSampleCode() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composePagedCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  PagedExpandRequest request =\n",
-            "      PagedExpandRequest.newBuilder()\n",
-            "          .setContent(\"content951530617\")\n",
-            "          .setPageSize(883849137)\n",
-            "          .setPageToken(\"pageToken873572522\")\n",
-            "          .build();\n",
-            "  ApiFuture future ="
-                + " echoClient.pagedExpandPagedCallable().futureCall(request);\n",
-            "  // Do something.\n",
-            "  for (EchoResponse element : future.get().iterateAll()) {\n",
-            "    // doThingsWith(element);\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void invalidComposePagedCallableMethodHeaderSampleCode_inputTypeNotExistInMessage() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NotExistRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composePagedCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void invalidComposePagedCallableMethodHeaderSampleCode_noExistMethodResponse() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NoExistResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composePagedCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void invalidComposePagedCallableMethodHeaderSampleCode_noRepeatedResponse() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NoRepeatedResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    Field responseField = Field.builder().setName("response").setType(TypeNode.STRING).build();
-    Message noRepeatedResponseMessage =
-        Message.builder()
-            .setName("NoRepeatedResponse")
-            .setFullProtoName("google.showcase.v1beta1.NoRepeatedResponse")
-            .setType(
-                TypeNode.withReference(
-                    VaporReference.builder()
-                        .setName("NoRepeatedResponse")
-                        .setPakkage(SHOWCASE_PACKAGE_NAME)
-                        .build()))
-            .setFields(Arrays.asList(responseField))
-            .build();
-    messageTypes.put("NoRepeatedResponse", noRepeatedResponseMessage);
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composePagedCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  // ==============================Stream Callable Method Sample Code ====================//
-  @Test
-  public void validComposeStreamCallableMethodHeaderSampleCode_serverStream() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("ExpandRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("Expand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setStream(Stream.SERVER)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  ExpandRequest request =\n",
-            "     "
-                + " ExpandRequest.newBuilder().setContent(\"content951530617\").setInfo(\"info3237038\").build();\n",
-            "  ServerStream stream = echoClient.expandCallable().call(request);\n",
-            "  for (EchoResponse response : stream) {\n",
-            "    // Do something when a response is received.\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void invalidComposeStreamCallableMethodHeaderSampleCode_serverStreamNotExistRequest() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NotExistRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("Expand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setStream(Stream.SERVER)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void validComposeStreamCallableMethodHeaderSampleCode_bidiStream() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("chat")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setStream(Stream.BIDI)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  BidiStream bidiStream ="
-                + " echoClient.chatCallable().call();\n",
-            "  EchoRequest request =\n",
-            "      EchoRequest.newBuilder()\n",
-            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setSeverity(Severity.forNumber(0))\n",
-            "          .setFoobar(Foobar.newBuilder().build())\n",
-            "          .build();\n",
-            "  bidiStream.send(request);\n",
-            "  for (EchoResponse response : bidiStream) {\n",
-            "    // Do something when a response is received.\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void invalidComposeStreamCallableMethodHeaderSampleCode_bidiStreamNotExistRequest() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NotExistRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("chat")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setStream(Stream.BIDI)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void validComposeStreamCallableMethodHeaderSampleCode_clientStream() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("Collect")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setStream(Stream.CLIENT)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  ApiStreamObserver responseObserver =\n",
-            "      new ApiStreamObserver() {\n",
-            "        {@literal @}Override\n",
-            "        public void onNext(EchoResponse response) {\n",
-            "          // Do something when a response is received.\n",
-            "        }\n",
-            "\n",
-            "        {@literal @}Override\n",
-            "        public void onError(Throwable t) {\n",
-            "          // Add error-handling\n",
-            "        }\n",
-            "\n",
-            "        {@literal @}Override\n",
-            "        public void onCompleted() {\n",
-            "          // Do something when complete.\n",
-            "        }\n",
-            "      };\n",
-            "  ApiStreamObserver requestObserver =\n",
-            "      echoClient.collect().clientStreamingCall(responseObserver);\n",
-            "  EchoRequest request =\n",
-            "      EchoRequest.newBuilder()\n",
-            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setSeverity(Severity.forNumber(0))\n",
-            "          .setFoobar(Foobar.newBuilder().build())\n",
-            "          .build();\n",
-            "  requestObserver.onNext(request);\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void invalidComposeStreamCallableMethodHeaderSampleCode_clientStreamNotExistRequest() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NotExistRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("Collect")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setStream(Stream.CLIENT)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  // ================================Regular Callable Method Sample Code ====================//
-  @Test
-  public void validComposeRegularCallableMethodHeaderSampleCode_unaryRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder().setName("Echo").setInputType(inputType).setOutputType(outputType).build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  EchoRequest request =\n",
-            "      EchoRequest.newBuilder()\n",
-            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\","
-                + " \"[FOOBAR]\").toString())\n",
-            "          .setSeverity(Severity.forNumber(0))\n",
-            "          .setFoobar(Foobar.newBuilder().build())\n",
-            "          .build();\n",
-            "  ApiFuture future = echoClient.echoCallable().futureCall(request);\n",
-            "  // Do something.\n",
-            "  EchoResponse response = future.get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRegularCallableMethodHeaderSampleCode_lroRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
-            "  ApiFuture future = echoClient.waitCallable().futureCall(request);\n",
-            "  // Do something.\n",
-            "  Operation response = future.get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRegularCallableMethodHeaderSampleCode_lroRpcWithReturnVoid() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
-    TypeNode responseType =
-        TypeNode.withReference(
-            VaporReference.builder().setName("Empty").setPakkage(PROTO_PACKAGE_NAME).build());
-    TypeNode metadataType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("WaitMetadata")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    LongrunningOperation lro =
-        LongrunningOperation.builder()
-            .setResponseType(responseType)
-            .setMetadataType(metadataType)
-            .build();
-    Method method =
-        Method.builder()
-            .setName("Wait")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setLro(lro)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  WaitRequest request = WaitRequest.newBuilder().build();\n",
-            "  ApiFuture future = echoClient.waitCallable().futureCall(request);\n",
-            "  // Do something.\n",
-            "  future.get();\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void validComposeRegularCallableMethodHeaderSampleCode_pageRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("PagedExpandResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setMethodSignatures(Collections.emptyList())
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    String results =
-        ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
-            method, clientType, resourceNames, messageTypes);
-    String expected =
-        LineFormatter.lines(
-            "try (EchoClient echoClient = EchoClient.create()) {\n",
-            "  PagedExpandRequest request =\n",
-            "      PagedExpandRequest.newBuilder()\n",
-            "          .setContent(\"content951530617\")\n",
-            "          .setPageSize(883849137)\n",
-            "          .setPageToken(\"pageToken873572522\")\n",
-            "          .build();\n",
-            "  while (true) {\n",
-            "    PagedExpandResponse response = echoClient.pagedExpandCallable().call(request);\n",
-            "    for (EchoResponse element : response.getResponsesList()) {\n",
-            "      // doThingsWith(element);\n",
-            "    }\n",
-            "    String nextPageToken = response.getNextPageToken();\n",
-            "    if (!Strings.isNullOrEmpty(nextPageToken)) {\n",
-            "      request = request.toBuilder().setPageToken(nextPageToken).build();\n",
-            "    } else {\n",
-            "      break;\n",
-            "    }\n",
-            "  }\n",
-            "}");
-    assertEquals(results, expected);
-  }
-
-  @Test
-  public void invalidComposeRegularCallableMethodHeaderSampleCode_noExistMethodRequest() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NoExistRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder().setName("Echo").setInputType(inputType).setOutputType(outputType).build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void invalidComposeRegularCallableMethodHeaderSampleCode_noExistMethodResponsePagedRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NoExistResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-
-  @Test
-  public void invalidComposeRegularCallableMethodHeaderSampleCode_noRepeatedResponsePagedRpc() {
-    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
-    Map resourceNames = Parser.parseResourceNames(echoFileDescriptor);
-    Map messageTypes = Parser.parseMessages(echoFileDescriptor);
-    TypeNode clientType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoClient")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode inputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("EchoRequest")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    TypeNode outputType =
-        TypeNode.withReference(
-            VaporReference.builder()
-                .setName("NoRepeatedResponse")
-                .setPakkage(SHOWCASE_PACKAGE_NAME)
-                .build());
-    Method method =
-        Method.builder()
-            .setName("PagedExpand")
-            .setInputType(inputType)
-            .setOutputType(outputType)
-            .setPageSizeFieldName(PAGINATED_FIELD_NAME)
-            .build();
-    Field responseField = Field.builder().setName("response").setType(TypeNode.STRING).build();
-    Message noRepeatedResponseMessage =
-        Message.builder()
-            .setName("NoRepeatedResponse")
-            .setFullProtoName("google.showcase.v1beta1.NoRepeatedResponse")
-            .setType(
-                TypeNode.withReference(
-                    VaporReference.builder()
-                        .setName("NoRepeatedResponse")
-                        .setPakkage(SHOWCASE_PACKAGE_NAME)
-                        .build()))
-            .setFields(Arrays.asList(responseField))
-            .build();
-    messageTypes.put("NoRepeatedResponse", noRepeatedResponseMessage);
-    assertThrows(
-        NullPointerException.class,
-        () ->
-            ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
-                method, clientType, resourceNames, messageTypes));
-  }
-}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleCodeComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleComposerTest.java
similarity index 77%
rename from src/test/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleCodeComposerTest.java
rename to src/test/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleComposerTest.java
index a62d57275c..33e428efeb 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleCodeComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/SettingsSampleComposerTest.java
@@ -18,13 +18,14 @@
 
 import com.google.api.generator.engine.ast.TypeNode;
 import com.google.api.generator.engine.ast.VaporReference;
+import com.google.api.generator.gapic.model.Sample;
 import com.google.api.generator.testutils.LineFormatter;
 import java.util.Optional;
 import org.junit.Test;
 
-public class SettingsSampleCodeComposerTest {
+public class SettingsSampleComposerTest {
   @Test
-  public void composeSettingsSampleCode_noMethods() {
+  public void composeSettingsSample_noMethods() {
     TypeNode classType =
         TypeNode.withReference(
             VaporReference.builder()
@@ -32,12 +33,14 @@ public void composeSettingsSampleCode_noMethods() {
                 .setPakkage("com.google.showcase.v1beta1")
                 .build());
     Optional results =
-        SettingsSampleCodeComposer.composeSampleCode(Optional.empty(), "EchoSettings", classType);
+        writeSample(
+            SettingsSampleComposer.composeSettingsSample(
+                Optional.empty(), "EchoSettings", classType));
     assertEquals(results, Optional.empty());
   }
 
   @Test
-  public void composeSettingsSampleCode_serviceSettingsClass() {
+  public void composeSettingsSample_serviceSettingsClass() {
     TypeNode classType =
         TypeNode.withReference(
             VaporReference.builder()
@@ -45,8 +48,9 @@ public void composeSettingsSampleCode_serviceSettingsClass() {
                 .setPakkage("com.google.showcase.v1beta1")
                 .build());
     Optional results =
-        SettingsSampleCodeComposer.composeSampleCode(
-            Optional.of("Echo"), "EchoSettings", classType);
+        writeSample(
+            SettingsSampleComposer.composeSettingsSample(
+                Optional.of("Echo"), "EchoSettings", classType));
     String expected =
         LineFormatter.lines(
             "EchoSettings.Builder echoSettingsBuilder = EchoSettings.newBuilder();\n",
@@ -64,7 +68,7 @@ public void composeSettingsSampleCode_serviceSettingsClass() {
   }
 
   @Test
-  public void composeSettingsSampleCode_serviceStubClass() {
+  public void composeSettingsSample_serviceStubClass() {
     TypeNode classType =
         TypeNode.withReference(
             VaporReference.builder()
@@ -72,8 +76,9 @@ public void composeSettingsSampleCode_serviceStubClass() {
                 .setPakkage("com.google.showcase.v1beta1")
                 .build());
     Optional results =
-        SettingsSampleCodeComposer.composeSampleCode(
-            Optional.of("Echo"), "EchoSettings", classType);
+        writeSample(
+            SettingsSampleComposer.composeSettingsSample(
+                Optional.of("Echo"), "EchoSettings", classType));
     String expected =
         LineFormatter.lines(
             "EchoStubSettings.Builder echoSettingsBuilder = EchoStubSettings.newBuilder();\n",
@@ -89,4 +94,11 @@ public void composeSettingsSampleCode_serviceStubClass() {
             "EchoStubSettings echoSettings = echoSettingsBuilder.build();");
     assertEquals(results.get(), expected);
   }
+
+  private Optional writeSample(Optional sample) {
+    if (sample.isPresent()) {
+      return Optional.of(SampleCodeWriter.write(sample.get().body()));
+    }
+    return Optional.empty();
+  }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/model/RegionTagTest.java b/src/test/java/com/google/api/generator/gapic/model/RegionTagTest.java
new file mode 100644
index 0000000000..a45d206de9
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/model/RegionTagTest.java
@@ -0,0 +1,150 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.model;
+
+import com.google.api.generator.gapic.composer.samplecode.SampleCodeWriter;
+import com.google.api.generator.testutils.LineFormatter;
+import java.util.Arrays;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class RegionTagTest {
+  private final String serviceName = "serviceName";
+  private final String apiVersion = "v1";
+  private final String apiShortName = "shortName";
+  private final String rpcName = "rpcName";
+  private final String disambiguation = "disambiguation";
+
+  @Test
+  public void regionTagNoRpcName() {
+    Assert.assertThrows(
+        IllegalStateException.class,
+        () ->
+            RegionTag.builder()
+                .setApiVersion(apiVersion)
+                .setApiShortName(apiShortName)
+                .setServiceName(serviceName)
+                .setOverloadDisambiguation(disambiguation)
+                .setIsAsynchronous(true)
+                .build());
+  }
+
+  @Test
+  public void regionTagNoServiceName() {
+    Assert.assertThrows(
+        IllegalStateException.class,
+        () ->
+            RegionTag.builder()
+                .setApiVersion(apiVersion)
+                .setApiShortName(apiShortName)
+                .setRpcName(rpcName)
+                .setOverloadDisambiguation(disambiguation)
+                .setIsAsynchronous(true)
+                .build());
+  }
+
+  @Test
+  public void regionTagValidMissingFields() {
+    RegionTag regionTag =
+        RegionTag.builder().setServiceName(serviceName).setRpcName(rpcName).build();
+
+    Assert.assertEquals("", regionTag.apiShortName());
+    Assert.assertEquals("", regionTag.apiVersion());
+    Assert.assertEquals("", regionTag.overloadDisambiguation());
+    Assert.assertEquals(false, regionTag.isAsynchronous());
+  }
+
+  @Test
+  public void regionTagSanitizeAttributes() {
+    String apiVersion = "1.4.0-";
+    String serviceName = "service_Na@m*.e!{}";
+    String rpcName = "rpc _Nam^#,e   [String]10";
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setApiVersion(apiVersion)
+            .setServiceName(serviceName)
+            .setRpcName(rpcName)
+            .build();
+
+    Assert.assertEquals("140Version", regionTag.apiVersion());
+    Assert.assertEquals("ServiceNameString", regionTag.serviceName());
+    Assert.assertEquals("RpcNameString10", regionTag.rpcName());
+  }
+
+  @Test
+  public void generateRegionTagsMissingRequiredFields() {
+    RegionTag rtMissingShortName =
+        RegionTag.builder()
+            .setApiVersion(apiVersion)
+            .setServiceName(serviceName)
+            .setRpcName(rpcName)
+            .build();
+    Assert.assertThrows(IllegalStateException.class, () -> rtMissingShortName.generate());
+  }
+
+  @Test
+  public void generateRegionTagsValidMissingFields() {
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setApiShortName(apiShortName)
+            .setServiceName(serviceName)
+            .setRpcName(rpcName)
+            .build();
+
+    String result = regionTag.generate();
+    String expected = "shortname_generated_servicename_rpcname_sync";
+    Assert.assertEquals(expected, result);
+  }
+
+  @Test
+  public void generateRegionTagsAllFields() {
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setApiShortName(apiShortName)
+            .setApiVersion(apiVersion)
+            .setServiceName(serviceName)
+            .setRpcName(rpcName)
+            .setOverloadDisambiguation(disambiguation)
+            .setIsAsynchronous(true)
+            .build();
+
+    String result = regionTag.generate();
+    String expected = "shortname_v1_generated_servicename_rpcname_disambiguation_async";
+    Assert.assertEquals(expected, result);
+  }
+
+  @Test
+  public void generateRegionTagTag() {
+    RegionTag regionTag =
+        RegionTag.builder()
+            .setApiShortName(apiShortName)
+            .setApiVersion(apiVersion)
+            .setServiceName(serviceName)
+            .setRpcName(rpcName)
+            .setOverloadDisambiguation(disambiguation)
+            .build();
+
+    String result =
+        SampleCodeWriter.write(
+            Arrays.asList(
+                regionTag.generateTag(RegionTag.RegionTagRegion.START, regionTag.generate()),
+                regionTag.generateTag(RegionTag.RegionTagRegion.END, regionTag.generate())));
+    String expected =
+        LineFormatter.lines(
+            "// [START shortname_v1_generated_servicename_rpcname_disambiguation_sync]\n",
+            "// [END shortname_v1_generated_servicename_rpcname_disambiguation_sync]");
+    Assert.assertEquals(expected, result);
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/model/SampleTest.java b/src/test/java/com/google/api/generator/gapic/model/SampleTest.java
new file mode 100644
index 0000000000..566c4f37d6
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/model/SampleTest.java
@@ -0,0 +1,73 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.model;
+
+import com.google.api.generator.engine.ast.BlockComment;
+import com.google.api.generator.engine.ast.CommentStatement;
+import com.google.api.generator.engine.ast.LineComment;
+import com.google.api.generator.engine.ast.Statement;
+import com.google.common.collect.ImmutableList;
+import java.util.Arrays;
+import java.util.List;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SampleTest {
+  private final RegionTag regionTag =
+      RegionTag.builder().setServiceName("serviceName").setRpcName("rpcName").build();
+  private final List sampleBody =
+      Arrays.asList(CommentStatement.withComment(LineComment.withComment("testing")));
+  private final List header =
+      Arrays.asList(CommentStatement.withComment(BlockComment.withComment("apache license")));
+
+  @Test
+  public void sampleNoRegionTag() {
+    Assert.assertThrows(
+        IllegalStateException.class,
+        () -> Sample.builder().setBody(sampleBody).setFileHeader(header).build());
+  }
+
+  @Test
+  public void sampleValidMissingFields() {
+    Sample sample = Sample.builder().setRegionTag(regionTag).build();
+
+    Assert.assertEquals(ImmutableList.of(), sample.fileHeader());
+    Assert.assertEquals(ImmutableList.of(), sample.body());
+    Assert.assertEquals(ImmutableList.of(), sample.variableAssignments());
+  }
+
+  @Test
+  public void sampleWithHeader() {
+    Sample sample = Sample.builder().setRegionTag(regionTag).setBody(sampleBody).build();
+    Assert.assertEquals(ImmutableList.of(), sample.fileHeader());
+
+    sample = sample.withHeader(header);
+    Assert.assertEquals(header, sample.fileHeader());
+  }
+
+  @Test
+  public void sampleNameWithRegionTag() {
+    Sample sample = Sample.builder().setRegionTag(regionTag).build();
+    Assert.assertEquals("SyncRpcName", sample.name());
+
+    RegionTag rt = regionTag.toBuilder().setOverloadDisambiguation("disambiguation").build();
+    sample = sample.withRegionTag(rt);
+    Assert.assertEquals("SyncRpcNameDisambiguation", sample.name());
+
+    rt = rt.toBuilder().setIsAsynchronous(true).build();
+    sample = sample.withRegionTag(rt);
+    Assert.assertEquals("AsyncRpcNameDisambiguation", sample.name());
+  }
+}
diff --git a/src/test/java/com/google/api/generator/test/framework/Assert.java b/src/test/java/com/google/api/generator/test/framework/Assert.java
index 4ed6a932fd..99a0adf1f6 100644
--- a/src/test/java/com/google/api/generator/test/framework/Assert.java
+++ b/src/test/java/com/google/api/generator/test/framework/Assert.java
@@ -14,8 +14,17 @@
 
 package com.google.api.generator.test.framework;
 
+import com.google.api.generator.engine.writer.JavaWriterVisitor;
+import com.google.api.generator.gapic.composer.comment.CommentComposer;
+import com.google.api.generator.gapic.composer.samplecode.SampleCodeWriter;
+import com.google.api.generator.gapic.model.GapicClass;
+import com.google.api.generator.gapic.model.Sample;
+import com.google.api.generator.gapic.utils.JavaStyle;
 import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
 import java.util.List;
+import java.util.stream.Collectors;
 import junit.framework.AssertionFailedError;
 
 public class Assert {
@@ -41,4 +50,38 @@ public static void assertCodeEquals(String expected, String codegen) {
       throw new AssertionFailedError("Differences found: \n" + String.join("\n", diffList));
     }
   }
+
+  public static void assertEmptySamples(List samples) {
+    if (!samples.isEmpty()) {
+      List diffList = samples.stream().map(Sample::name).collect(Collectors.toList());
+      throw new AssertionFailedError("Differences found: \n" + String.join("\n", diffList));
+    }
+  }
+
+  public static void assertGoldenClass(Class clazz, GapicClass gapicClass, String fileName) {
+    JavaWriterVisitor visitor = new JavaWriterVisitor();
+    gapicClass.classDefinition().accept(visitor);
+    Utils.saveCodegenToFile(clazz, fileName, visitor.write());
+    Path goldenFilePath = Paths.get(Utils.getGoldenDir(clazz), fileName);
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
+  }
+
+  public static void assertGoldenSamples(
+      Class clazz, String sampleDirName, String packkage, List samples) {
+    for (Sample sample : samples) {
+      String fileName = JavaStyle.toUpperCamelCase(sample.name()).concat(".golden");
+      String goldenSampleDir =
+          Utils.getGoldenDir(clazz) + "/samples/" + sampleDirName.toLowerCase() + "/";
+      Path goldenFilePath = Paths.get(goldenSampleDir, fileName);
+      sample =
+          sample
+              .withHeader(Arrays.asList(CommentComposer.APACHE_LICENSE_COMMENT))
+              .withRegionTag(sample.regionTag().withApiShortName("goldenSample"));
+
+      String sampleString = SampleCodeWriter.writeExecutableSample(sample, packkage + ".samples");
+
+      Utils.saveSampleCodegenToFile(clazz, sampleDirName, fileName, sampleString);
+      assertCodeEquals(goldenFilePath, sampleString);
+    }
+  }
 }
diff --git a/src/test/java/com/google/api/generator/test/framework/Differ.java b/src/test/java/com/google/api/generator/test/framework/Differ.java
index 74e5d76135..eea5c7b937 100644
--- a/src/test/java/com/google/api/generator/test/framework/Differ.java
+++ b/src/test/java/com/google/api/generator/test/framework/Differ.java
@@ -44,7 +44,7 @@ public static List diff(String expectedStr, String actualStr) {
     return diffTwoStringLists(original, revised);
   }
 
-  private static List diffTwoStringLists(List original, List revised) {
+  static List diffTwoStringLists(List original, List revised) {
     Patch diff = null;
     try {
       diff = DiffUtils.diff(original, revised);
diff --git a/src/test/java/com/google/api/generator/test/framework/Utils.java b/src/test/java/com/google/api/generator/test/framework/Utils.java
index 3d5a4359ab..cb423046fb 100644
--- a/src/test/java/com/google/api/generator/test/framework/Utils.java
+++ b/src/test/java/com/google/api/generator/test/framework/Utils.java
@@ -34,6 +34,16 @@ public class Utils {
    */
   public static void saveCodegenToFile(Class clazz, String fileName, String codegen) {
     String relativeGoldenDir = getTestoutGoldenDir(clazz);
+    saveCodeToFile(relativeGoldenDir, fileName, codegen);
+  }
+
+  public static void saveSampleCodegenToFile(
+      Class clazz, String sampleDir, String fileName, String codegen) {
+    String relativeGoldenDir = getTestoutGoldenDir(clazz) + "/samples/" + sampleDir;
+    saveCodeToFile(relativeGoldenDir, fileName, codegen);
+  }
+
+  private static void saveCodeToFile(String relativeGoldenDir, String fileName, String codegen) {
     Path testOutputDir = Paths.get("src", "test", "java", relativeGoldenDir);
 
     // Auto-detect project workspace when running `bazel run //:update_TargetTest`.
diff --git a/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceClient.java b/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceClient.java
index 872d51b763..501a2c124d 100644
--- a/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceClient.java
+++ b/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceClient.java
@@ -47,6 +47,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
  *   BatchGetAssetsHistoryRequest request =
  *       BatchGetAssetsHistoryRequest.newBuilder()
@@ -89,6 +91,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AssetServiceSettings assetServiceSettings =
  *     AssetServiceSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -99,6 +103,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AssetServiceSettings assetServiceSettings =
  *     AssetServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
  * AssetServiceClient assetServiceClient = AssetServiceClient.create(assetServiceSettings);
@@ -183,6 +189,8 @@ public final OperationsClient getOperationsClient() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ExportAssetsRequest request =
    *       ExportAssetsRequest.newBuilder()
@@ -219,6 +227,8 @@ public final OperationFuture exportAs
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ExportAssetsRequest request =
    *       ExportAssetsRequest.newBuilder()
@@ -255,6 +265,8 @@ public final OperationFuture exportAs
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ExportAssetsRequest request =
    *       ExportAssetsRequest.newBuilder()
@@ -282,6 +294,8 @@ public final UnaryCallable exportAssetsCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ResourceName parent = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]");
    *   for (Asset element : assetServiceClient.listAssets(parent).iterateAll()) {
@@ -309,6 +323,8 @@ public final ListAssetsPagedResponse listAssets(ResourceName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   String parent = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]").toString();
    *   for (Asset element : assetServiceClient.listAssets(parent).iterateAll()) {
@@ -335,6 +351,8 @@ public final ListAssetsPagedResponse listAssets(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ListAssetsRequest request =
    *       ListAssetsRequest.newBuilder()
@@ -366,6 +384,8 @@ public final ListAssetsPagedResponse listAssets(ListAssetsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ListAssetsRequest request =
    *       ListAssetsRequest.newBuilder()
@@ -396,6 +416,8 @@ public final UnaryCallable listAsset
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ListAssetsRequest request =
    *       ListAssetsRequest.newBuilder()
@@ -437,6 +459,8 @@ public final UnaryCallable listAssetsCall
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   BatchGetAssetsHistoryRequest request =
    *       BatchGetAssetsHistoryRequest.newBuilder()
@@ -469,6 +493,8 @@ public final BatchGetAssetsHistoryResponse batchGetAssetsHistory(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   BatchGetAssetsHistoryRequest request =
    *       BatchGetAssetsHistoryRequest.newBuilder()
@@ -497,6 +523,8 @@ public final BatchGetAssetsHistoryResponse batchGetAssetsHistory(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   String parent = "parent-995424086";
    *   Feed response = assetServiceClient.createFeed(parent);
@@ -521,6 +549,8 @@ public final Feed createFeed(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   CreateFeedRequest request =
    *       CreateFeedRequest.newBuilder()
@@ -546,6 +576,8 @@ public final Feed createFeed(CreateFeedRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   CreateFeedRequest request =
    *       CreateFeedRequest.newBuilder()
@@ -570,6 +602,8 @@ public final UnaryCallable createFeedCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   FeedName name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]");
    *   Feed response = assetServiceClient.getFeed(name);
@@ -594,6 +628,8 @@ public final Feed getFeed(FeedName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   String name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]").toString();
    *   Feed response = assetServiceClient.getFeed(name);
@@ -617,6 +653,8 @@ public final Feed getFeed(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   GetFeedRequest request =
    *       GetFeedRequest.newBuilder()
@@ -640,6 +678,8 @@ public final Feed getFeed(GetFeedRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   GetFeedRequest request =
    *       GetFeedRequest.newBuilder()
@@ -662,6 +702,8 @@ public final UnaryCallable getFeedCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   String parent = "parent-995424086";
    *   ListFeedsResponse response = assetServiceClient.listFeeds(parent);
@@ -685,6 +727,8 @@ public final ListFeedsResponse listFeeds(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ListFeedsRequest request =
    *       ListFeedsRequest.newBuilder().setParent("parent-995424086").build();
@@ -706,6 +750,8 @@ public final ListFeedsResponse listFeeds(ListFeedsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   ListFeedsRequest request =
    *       ListFeedsRequest.newBuilder().setParent("parent-995424086").build();
@@ -727,6 +773,8 @@ public final UnaryCallable listFeedsCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   Feed feed = Feed.newBuilder().build();
    *   Feed response = assetServiceClient.updateFeed(feed);
@@ -750,6 +798,8 @@ public final Feed updateFeed(Feed feed) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   UpdateFeedRequest request =
    *       UpdateFeedRequest.newBuilder()
@@ -774,6 +824,8 @@ public final Feed updateFeed(UpdateFeedRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   UpdateFeedRequest request =
    *       UpdateFeedRequest.newBuilder()
@@ -797,6 +849,8 @@ public final UnaryCallable updateFeedCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   FeedName name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]");
    *   assetServiceClient.deleteFeed(name);
@@ -821,6 +875,8 @@ public final void deleteFeed(FeedName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   String name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]").toString();
    *   assetServiceClient.deleteFeed(name);
@@ -844,6 +900,8 @@ public final void deleteFeed(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   DeleteFeedRequest request =
    *       DeleteFeedRequest.newBuilder()
@@ -867,6 +925,8 @@ public final void deleteFeed(DeleteFeedRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   DeleteFeedRequest request =
    *       DeleteFeedRequest.newBuilder()
@@ -891,6 +951,8 @@ public final UnaryCallable deleteFeedCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   String scope = "scope109264468";
    *   String query = "query107944136";
@@ -985,6 +1047,8 @@ public final SearchAllResourcesPagedResponse searchAllResources(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   SearchAllResourcesRequest request =
    *       SearchAllResourcesRequest.newBuilder()
@@ -1020,6 +1084,8 @@ public final SearchAllResourcesPagedResponse searchAllResources(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   SearchAllResourcesRequest request =
    *       SearchAllResourcesRequest.newBuilder()
@@ -1054,6 +1120,8 @@ public final SearchAllResourcesPagedResponse searchAllResources(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   SearchAllResourcesRequest request =
    *       SearchAllResourcesRequest.newBuilder()
@@ -1095,6 +1163,8 @@ public final SearchAllResourcesPagedResponse searchAllResources(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   String scope = "scope109264468";
    *   String query = "query107944136";
@@ -1171,6 +1241,8 @@ public final SearchAllIamPoliciesPagedResponse searchAllIamPolicies(String scope
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   SearchAllIamPoliciesRequest request =
    *       SearchAllIamPoliciesRequest.newBuilder()
@@ -1205,6 +1277,8 @@ public final SearchAllIamPoliciesPagedResponse searchAllIamPolicies(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   SearchAllIamPoliciesRequest request =
    *       SearchAllIamPoliciesRequest.newBuilder()
@@ -1238,6 +1312,8 @@ public final SearchAllIamPoliciesPagedResponse searchAllIamPolicies(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   SearchAllIamPoliciesRequest request =
    *       SearchAllIamPoliciesRequest.newBuilder()
@@ -1276,6 +1352,8 @@ public final SearchAllIamPoliciesPagedResponse searchAllIamPolicies(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   AnalyzeIamPolicyRequest request =
    *       AnalyzeIamPolicyRequest.newBuilder()
@@ -1300,6 +1378,8 @@ public final AnalyzeIamPolicyResponse analyzeIamPolicy(AnalyzeIamPolicyRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   AnalyzeIamPolicyRequest request =
    *       AnalyzeIamPolicyRequest.newBuilder()
@@ -1332,6 +1412,8 @@ public final AnalyzeIamPolicyResponse analyzeIamPolicy(AnalyzeIamPolicyRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   AnalyzeIamPolicyLongrunningRequest request =
    *       AnalyzeIamPolicyLongrunningRequest.newBuilder()
@@ -1366,6 +1448,8 @@ public final AnalyzeIamPolicyResponse analyzeIamPolicy(AnalyzeIamPolicyRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   AnalyzeIamPolicyLongrunningRequest request =
    *       AnalyzeIamPolicyLongrunningRequest.newBuilder()
@@ -1402,6 +1486,8 @@ public final AnalyzeIamPolicyResponse analyzeIamPolicy(AnalyzeIamPolicyRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   AnalyzeIamPolicyLongrunningRequest request =
    *       AnalyzeIamPolicyLongrunningRequest.newBuilder()
@@ -1430,6 +1516,8 @@ public final AnalyzeIamPolicyResponse analyzeIamPolicy(AnalyzeIamPolicyRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   AnalyzeMoveRequest request =
    *       AnalyzeMoveRequest.newBuilder()
@@ -1457,6 +1545,8 @@ public final AnalyzeMoveResponse analyzeMove(AnalyzeMoveRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
    *   AnalyzeMoveRequest request =
    *       AnalyzeMoveRequest.newBuilder()
diff --git a/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceSettings.java b/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceSettings.java
index 7fa69d5191..24fe05b9e5 100644
--- a/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceSettings.java
+++ b/test/integration/goldens/asset/com/google/cloud/asset/v1/AssetServiceSettings.java
@@ -58,6 +58,8 @@
  * 
For example, to set the total timeout of batchGetAssetsHistory to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AssetServiceSettings.Builder assetServiceSettingsBuilder = AssetServiceSettings.newBuilder();
  * assetServiceSettingsBuilder
  *     .batchGetAssetsHistorySettings()
diff --git a/test/integration/goldens/asset/com/google/cloud/asset/v1/package-info.java b/test/integration/goldens/asset/com/google/cloud/asset/v1/package-info.java
index cb0c5531a1..e98658c5b0 100644
--- a/test/integration/goldens/asset/com/google/cloud/asset/v1/package-info.java
+++ b/test/integration/goldens/asset/com/google/cloud/asset/v1/package-info.java
@@ -24,6 +24,8 @@
  * 
Sample for AssetServiceClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
  *   BatchGetAssetsHistoryRequest request =
  *       BatchGetAssetsHistoryRequest.newBuilder()
diff --git a/test/integration/goldens/asset/com/google/cloud/asset/v1/stub/AssetServiceStubSettings.java b/test/integration/goldens/asset/com/google/cloud/asset/v1/stub/AssetServiceStubSettings.java
index 4b5ca31957..842073522f 100644
--- a/test/integration/goldens/asset/com/google/cloud/asset/v1/stub/AssetServiceStubSettings.java
+++ b/test/integration/goldens/asset/com/google/cloud/asset/v1/stub/AssetServiceStubSettings.java
@@ -102,6 +102,8 @@
  * 
For example, to set the total timeout of batchGetAssetsHistory to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AssetServiceStubSettings.Builder assetServiceSettingsBuilder =
  *     AssetServiceStubSettings.newBuilder();
  * assetServiceSettingsBuilder
diff --git a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataClient.java b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataClient.java
index f7ab00af96..b1543dcdca 100644
--- a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataClient.java
+++ b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataClient.java
@@ -52,6 +52,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
  *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
  *   ByteString rowKey = ByteString.EMPTY;
@@ -90,6 +92,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * BaseBigtableDataSettings baseBigtableDataSettings =
  *     BaseBigtableDataSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -101,6 +105,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * BaseBigtableDataSettings baseBigtableDataSettings =
  *     BaseBigtableDataSettings.newBuilder().setEndpoint(myEndpoint).build();
  * BaseBigtableDataClient baseBigtableDataClient =
@@ -172,6 +178,8 @@ public BigtableStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   ReadRowsRequest request =
    *       ReadRowsRequest.newBuilder()
@@ -202,6 +210,8 @@ public final ServerStreamingCallable readRows
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   SampleRowKeysRequest request =
    *       SampleRowKeysRequest.newBuilder()
@@ -229,6 +239,8 @@ public final ServerStreamingCallable readRows
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
    *   ByteString rowKey = ByteString.EMPTY;
@@ -265,6 +277,8 @@ public final MutateRowResponse mutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   String tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]").toString();
    *   ByteString rowKey = ByteString.EMPTY;
@@ -301,6 +315,8 @@ public final MutateRowResponse mutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
    *   ByteString rowKey = ByteString.EMPTY;
@@ -342,6 +358,8 @@ public final MutateRowResponse mutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   String tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]").toString();
    *   ByteString rowKey = ByteString.EMPTY;
@@ -383,6 +401,8 @@ public final MutateRowResponse mutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   MutateRowRequest request =
    *       MutateRowRequest.newBuilder()
@@ -410,6 +430,8 @@ public final MutateRowResponse mutateRow(MutateRowRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   MutateRowRequest request =
    *       MutateRowRequest.newBuilder()
@@ -437,6 +459,8 @@ public final UnaryCallable mutateRowCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   MutateRowsRequest request =
    *       MutateRowsRequest.newBuilder()
@@ -463,6 +487,8 @@ public final ServerStreamingCallable muta
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
    *   ByteString rowKey = ByteString.EMPTY;
@@ -516,6 +542,8 @@ public final CheckAndMutateRowResponse checkAndMutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   String tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]").toString();
    *   ByteString rowKey = ByteString.EMPTY;
@@ -569,6 +597,8 @@ public final CheckAndMutateRowResponse checkAndMutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
    *   ByteString rowKey = ByteString.EMPTY;
@@ -627,6 +657,8 @@ public final CheckAndMutateRowResponse checkAndMutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   String tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]").toString();
    *   ByteString rowKey = ByteString.EMPTY;
@@ -685,6 +717,8 @@ public final CheckAndMutateRowResponse checkAndMutateRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   CheckAndMutateRowRequest request =
    *       CheckAndMutateRowRequest.newBuilder()
@@ -713,6 +747,8 @@ public final CheckAndMutateRowResponse checkAndMutateRow(CheckAndMutateRowReques
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   CheckAndMutateRowRequest request =
    *       CheckAndMutateRowRequest.newBuilder()
@@ -745,6 +781,8 @@ public final CheckAndMutateRowResponse checkAndMutateRow(CheckAndMutateRowReques
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
    *   ByteString rowKey = ByteString.EMPTY;
@@ -785,6 +823,8 @@ public final ReadModifyWriteRowResponse readModifyWriteRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   String tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]").toString();
    *   ByteString rowKey = ByteString.EMPTY;
@@ -825,6 +865,8 @@ public final ReadModifyWriteRowResponse readModifyWriteRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
    *   ByteString rowKey = ByteString.EMPTY;
@@ -872,6 +914,8 @@ public final ReadModifyWriteRowResponse readModifyWriteRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   String tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]").toString();
    *   ByteString rowKey = ByteString.EMPTY;
@@ -916,6 +960,8 @@ public final ReadModifyWriteRowResponse readModifyWriteRow(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   ReadModifyWriteRowRequest request =
    *       ReadModifyWriteRowRequest.newBuilder()
@@ -945,6 +991,8 @@ public final ReadModifyWriteRowResponse readModifyWriteRow(ReadModifyWriteRowReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
    *   ReadModifyWriteRowRequest request =
    *       ReadModifyWriteRowRequest.newBuilder()
diff --git a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataSettings.java b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataSettings.java
index b363e2367e..d98451c60b 100644
--- a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataSettings.java
+++ b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/BaseBigtableDataSettings.java
@@ -63,6 +63,8 @@
  * 
For example, to set the total timeout of mutateRow to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * BaseBigtableDataSettings.Builder baseBigtableDataSettingsBuilder =
  *     BaseBigtableDataSettings.newBuilder();
  * baseBigtableDataSettingsBuilder
diff --git a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/package-info.java b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/package-info.java
index 8053595e28..5796a99103 100644
--- a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/package-info.java
+++ b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/package-info.java
@@ -24,6 +24,8 @@
  * 
Sample for BaseBigtableDataClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (BaseBigtableDataClient baseBigtableDataClient = BaseBigtableDataClient.create()) {
  *   TableName tableName = TableName.of("[PROJECT]", "[INSTANCE]", "[TABLE]");
  *   ByteString rowKey = ByteString.EMPTY;
diff --git a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/stub/BigtableStubSettings.java b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/stub/BigtableStubSettings.java
index a901956a22..9489b80f91 100644
--- a/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/stub/BigtableStubSettings.java
+++ b/test/integration/goldens/bigtable/com/google/cloud/bigtable/data/v2/stub/BigtableStubSettings.java
@@ -71,6 +71,8 @@
  * 
For example, to set the total timeout of mutateRow to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * BigtableStubSettings.Builder baseBigtableDataSettingsBuilder =
  *     BigtableStubSettings.newBuilder();
  * baseBigtableDataSettingsBuilder
diff --git a/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesClient.java b/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesClient.java
index f1af094dab..579e8a9336 100644
--- a/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesClient.java
+++ b/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesClient.java
@@ -46,6 +46,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (AddressesClient addressesClient = AddressesClient.create()) {
  *   String project = "project-309310695";
  *   for (Map.Entry element :
@@ -84,6 +86,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AddressesSettings addressesSettings =
  *     AddressesSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -94,6 +98,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AddressesSettings addressesSettings =
  *     AddressesSettings.newBuilder().setEndpoint(myEndpoint).build();
  * AddressesClient addressesClient = AddressesClient.create(addressesSettings);
@@ -159,6 +165,8 @@ public AddressesStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   String project = "project-309310695";
    *   for (Map.Entry element :
@@ -184,6 +192,8 @@ public final AggregatedListPagedResponse aggregatedList(String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   AggregatedListAddressesRequest request =
    *       AggregatedListAddressesRequest.newBuilder()
@@ -215,6 +225,8 @@ public final AggregatedListPagedResponse aggregatedList(AggregatedListAddressesR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   AggregatedListAddressesRequest request =
    *       AggregatedListAddressesRequest.newBuilder()
@@ -246,6 +258,8 @@ public final AggregatedListPagedResponse aggregatedList(AggregatedListAddressesR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   AggregatedListAddressesRequest request =
    *       AggregatedListAddressesRequest.newBuilder()
@@ -283,6 +297,8 @@ public final AggregatedListPagedResponse aggregatedList(AggregatedListAddressesR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   String project = "project-309310695";
    *   String region = "region-934795532";
@@ -314,6 +330,8 @@ public final OperationFuture deleteAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   DeleteAddressRequest request =
    *       DeleteAddressRequest.newBuilder()
@@ -342,6 +360,8 @@ public final OperationFuture deleteAsync(DeleteAddressRequ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   DeleteAddressRequest request =
    *       DeleteAddressRequest.newBuilder()
@@ -369,6 +389,8 @@ public final OperationFuture deleteAsync(DeleteAddressRequ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   DeleteAddressRequest request =
    *       DeleteAddressRequest.newBuilder()
@@ -394,6 +416,8 @@ public final UnaryCallable deleteCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   String project = "project-309310695";
    *   String region = "region-934795532";
@@ -425,6 +449,8 @@ public final OperationFuture insertAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   InsertAddressRequest request =
    *       InsertAddressRequest.newBuilder()
@@ -453,6 +479,8 @@ public final OperationFuture insertAsync(InsertAddressRequ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   InsertAddressRequest request =
    *       InsertAddressRequest.newBuilder()
@@ -480,6 +508,8 @@ public final OperationFuture insertAsync(InsertAddressRequ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   InsertAddressRequest request =
    *       InsertAddressRequest.newBuilder()
@@ -505,6 +535,8 @@ public final UnaryCallable insertCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   String project = "project-309310695";
    *   String region = "region-934795532";
@@ -543,6 +575,8 @@ public final ListPagedResponse list(String project, String region, String orderB
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   ListAddressesRequest request =
    *       ListAddressesRequest.newBuilder()
@@ -573,6 +607,8 @@ public final ListPagedResponse list(ListAddressesRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   ListAddressesRequest request =
    *       ListAddressesRequest.newBuilder()
@@ -602,6 +638,8 @@ public final UnaryCallable listPagedCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (AddressesClient addressesClient = AddressesClient.create()) {
    *   ListAddressesRequest request =
    *       ListAddressesRequest.newBuilder()
diff --git a/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesSettings.java b/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesSettings.java
index 7023bdafb8..d5c799453b 100644
--- a/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesSettings.java
+++ b/test/integration/goldens/compute/com/google/cloud/compute/v1small/AddressesSettings.java
@@ -55,6 +55,8 @@
  * 
For example, to set the total timeout of aggregatedList to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AddressesSettings.Builder addressesSettingsBuilder = AddressesSettings.newBuilder();
  * addressesSettingsBuilder
  *     .aggregatedListSettings()
diff --git a/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsClient.java b/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsClient.java
index b5b07641ad..dcec18f5b3 100644
--- a/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsClient.java
+++ b/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsClient.java
@@ -33,6 +33,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
  *   String project = "project-309310695";
  *   String region = "region-934795532";
@@ -71,6 +73,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * RegionOperationsSettings regionOperationsSettings =
  *     RegionOperationsSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -82,6 +86,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * RegionOperationsSettings regionOperationsSettings =
  *     RegionOperationsSettings.newBuilder().setEndpoint(myEndpoint).build();
  * RegionOperationsClient regionOperationsClient =
@@ -150,6 +156,8 @@ public RegionOperationsStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
    *   String project = "project-309310695";
    *   String region = "region-934795532";
@@ -180,6 +188,8 @@ public final Operation get(String project, String region, String operation) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
    *   GetRegionOperationRequest request =
    *       GetRegionOperationRequest.newBuilder()
@@ -205,6 +215,8 @@ public final Operation get(GetRegionOperationRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
    *   GetRegionOperationRequest request =
    *       GetRegionOperationRequest.newBuilder()
@@ -238,6 +250,8 @@ public final UnaryCallable getCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
    *   String project = "project-309310695";
    *   String region = "region-934795532";
@@ -277,6 +291,8 @@ public final Operation wait(String project, String region, String operation) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
    *   WaitRegionOperationRequest request =
    *       WaitRegionOperationRequest.newBuilder()
@@ -311,6 +327,8 @@ public final Operation wait(WaitRegionOperationRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
    *   WaitRegionOperationRequest request =
    *       WaitRegionOperationRequest.newBuilder()
diff --git a/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsSettings.java b/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsSettings.java
index 6972d21b7a..7481512b16 100644
--- a/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsSettings.java
+++ b/test/integration/goldens/compute/com/google/cloud/compute/v1small/RegionOperationsSettings.java
@@ -50,6 +50,8 @@
  * 
For example, to set the total timeout of get to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * RegionOperationsSettings.Builder regionOperationsSettingsBuilder =
  *     RegionOperationsSettings.newBuilder();
  * regionOperationsSettingsBuilder
diff --git a/test/integration/goldens/compute/com/google/cloud/compute/v1small/package-info.java b/test/integration/goldens/compute/com/google/cloud/compute/v1small/package-info.java
index a50a95d460..7f945ac078 100644
--- a/test/integration/goldens/compute/com/google/cloud/compute/v1small/package-info.java
+++ b/test/integration/goldens/compute/com/google/cloud/compute/v1small/package-info.java
@@ -26,6 +26,8 @@
  * 
Sample for AddressesClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (AddressesClient addressesClient = AddressesClient.create()) {
  *   String project = "project-309310695";
  *   for (Map.Entry element :
@@ -42,6 +44,8 @@
  * 
Sample for RegionOperationsClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (RegionOperationsClient regionOperationsClient = RegionOperationsClient.create()) {
  *   String project = "project-309310695";
  *   String region = "region-934795532";
diff --git a/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/AddressesStubSettings.java b/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/AddressesStubSettings.java
index 29a32cc6b1..d870e63477 100644
--- a/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/AddressesStubSettings.java
+++ b/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/AddressesStubSettings.java
@@ -83,6 +83,8 @@
  * 
For example, to set the total timeout of aggregatedList to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * AddressesStubSettings.Builder addressesSettingsBuilder = AddressesStubSettings.newBuilder();
  * addressesSettingsBuilder
  *     .aggregatedListSettings()
diff --git a/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/RegionOperationsStubSettings.java b/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/RegionOperationsStubSettings.java
index 8e64114336..83ba9319e1 100644
--- a/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/RegionOperationsStubSettings.java
+++ b/test/integration/goldens/compute/com/google/cloud/compute/v1small/stub/RegionOperationsStubSettings.java
@@ -61,6 +61,8 @@
  * 
For example, to set the total timeout of get to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * RegionOperationsStubSettings.Builder regionOperationsSettingsBuilder =
  *     RegionOperationsStubSettings.newBuilder();
  * regionOperationsSettingsBuilder
diff --git a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsClient.java b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsClient.java
index ccb4b7cc2f..5c1dd677c3 100644
--- a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsClient.java
+++ b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsClient.java
@@ -43,6 +43,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
  *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
  *   List delegates = new ArrayList<>();
@@ -82,6 +84,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IamCredentialsSettings iamCredentialsSettings =
  *     IamCredentialsSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -92,6 +96,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IamCredentialsSettings iamCredentialsSettings =
  *     IamCredentialsSettings.newBuilder().setEndpoint(myEndpoint).build();
  * IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create(iamCredentialsSettings);
@@ -159,6 +165,8 @@ public IamCredentialsStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
    *   List delegates = new ArrayList<>();
@@ -208,6 +216,8 @@ public final GenerateAccessTokenResponse generateAccessToken(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   String name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]").toString();
    *   List delegates = new ArrayList<>();
@@ -257,6 +267,8 @@ public final GenerateAccessTokenResponse generateAccessToken(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   GenerateAccessTokenRequest request =
    *       GenerateAccessTokenRequest.newBuilder()
@@ -283,6 +295,8 @@ public final GenerateAccessTokenResponse generateAccessToken(GenerateAccessToken
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   GenerateAccessTokenRequest request =
    *       GenerateAccessTokenRequest.newBuilder()
@@ -310,6 +324,8 @@ public final GenerateAccessTokenResponse generateAccessToken(GenerateAccessToken
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
    *   List delegates = new ArrayList<>();
@@ -357,6 +373,8 @@ public final GenerateIdTokenResponse generateIdToken(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   String name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]").toString();
    *   List delegates = new ArrayList<>();
@@ -404,6 +422,8 @@ public final GenerateIdTokenResponse generateIdToken(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   GenerateIdTokenRequest request =
    *       GenerateIdTokenRequest.newBuilder()
@@ -430,6 +450,8 @@ public final GenerateIdTokenResponse generateIdToken(GenerateIdTokenRequest requ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   GenerateIdTokenRequest request =
    *       GenerateIdTokenRequest.newBuilder()
@@ -457,6 +479,8 @@ public final GenerateIdTokenResponse generateIdToken(GenerateIdTokenRequest requ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
    *   List delegates = new ArrayList<>();
@@ -498,6 +522,8 @@ public final SignBlobResponse signBlob(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   String name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]").toString();
    *   List delegates = new ArrayList<>();
@@ -538,6 +564,8 @@ public final SignBlobResponse signBlob(String name, List delegates, Byte
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   SignBlobRequest request =
    *       SignBlobRequest.newBuilder()
@@ -563,6 +591,8 @@ public final SignBlobResponse signBlob(SignBlobRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   SignBlobRequest request =
    *       SignBlobRequest.newBuilder()
@@ -588,6 +618,8 @@ public final UnaryCallable signBlobCallable()
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
    *   List delegates = new ArrayList<>();
@@ -629,6 +661,8 @@ public final SignJwtResponse signJwt(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   String name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]").toString();
    *   List delegates = new ArrayList<>();
@@ -669,6 +703,8 @@ public final SignJwtResponse signJwt(String name, List delegates, String
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   SignJwtRequest request =
    *       SignJwtRequest.newBuilder()
@@ -694,6 +730,8 @@ public final SignJwtResponse signJwt(SignJwtRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
    *   SignJwtRequest request =
    *       SignJwtRequest.newBuilder()
diff --git a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsSettings.java b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsSettings.java
index 57f32e2dc4..dd2dd1fdef 100644
--- a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsSettings.java
+++ b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/IamCredentialsSettings.java
@@ -51,6 +51,8 @@
  * 
For example, to set the total timeout of generateAccessToken to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IamCredentialsSettings.Builder iamCredentialsSettingsBuilder =
  *     IamCredentialsSettings.newBuilder();
  * iamCredentialsSettingsBuilder
diff --git a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/package-info.java b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/package-info.java
index c88c831eba..da4fef9f25 100644
--- a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/package-info.java
+++ b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/package-info.java
@@ -31,6 +31,8 @@
  * 
Sample for IamCredentialsClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
  *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
  *   List delegates = new ArrayList<>();
diff --git a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/stub/IamCredentialsStubSettings.java b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/stub/IamCredentialsStubSettings.java
index 68f633d7d1..c5a188f4fc 100644
--- a/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/stub/IamCredentialsStubSettings.java
+++ b/test/integration/goldens/credentials/com/google/cloud/iam/credentials/v1/stub/IamCredentialsStubSettings.java
@@ -67,6 +67,8 @@
  * 
For example, to set the total timeout of generateAccessToken to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IamCredentialsStubSettings.Builder iamCredentialsSettingsBuilder =
  *     IamCredentialsStubSettings.newBuilder();
  * iamCredentialsSettingsBuilder
diff --git a/test/integration/goldens/iam/com/google/iam/v1/IAMPolicyClient.java b/test/integration/goldens/iam/com/google/iam/v1/IAMPolicyClient.java
index c8ed891b8f..64444f651d 100644
--- a/test/integration/goldens/iam/com/google/iam/v1/IAMPolicyClient.java
+++ b/test/integration/goldens/iam/com/google/iam/v1/IAMPolicyClient.java
@@ -54,6 +54,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
  *   SetIamPolicyRequest request =
  *       SetIamPolicyRequest.newBuilder()
@@ -93,6 +95,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IAMPolicySettings iAMPolicySettings =
  *     IAMPolicySettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -103,6 +107,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IAMPolicySettings iAMPolicySettings =
  *     IAMPolicySettings.newBuilder().setEndpoint(myEndpoint).build();
  * IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create(iAMPolicySettings);
@@ -168,6 +174,8 @@ public IAMPolicyStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -192,6 +200,8 @@ public final Policy setIamPolicy(SetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -216,6 +226,8 @@ public final UnaryCallable setIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -241,6 +253,8 @@ public final Policy getIamPolicy(GetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -269,6 +283,8 @@ public final UnaryCallable getIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
@@ -298,6 +314,8 @@ public final TestIamPermissionsResponse testIamPermissions(TestIamPermissionsReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
diff --git a/test/integration/goldens/iam/com/google/iam/v1/IAMPolicySettings.java b/test/integration/goldens/iam/com/google/iam/v1/IAMPolicySettings.java
index 04b5f1d8b5..342de64f79 100644
--- a/test/integration/goldens/iam/com/google/iam/v1/IAMPolicySettings.java
+++ b/test/integration/goldens/iam/com/google/iam/v1/IAMPolicySettings.java
@@ -50,6 +50,8 @@
  * 
For example, to set the total timeout of setIamPolicy to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IAMPolicySettings.Builder iAMPolicySettingsBuilder = IAMPolicySettings.newBuilder();
  * iAMPolicySettingsBuilder
  *     .setIamPolicySettings()
diff --git a/test/integration/goldens/iam/com/google/iam/v1/package-info.java b/test/integration/goldens/iam/com/google/iam/v1/package-info.java
index 92ccf1f602..9765ae91e3 100644
--- a/test/integration/goldens/iam/com/google/iam/v1/package-info.java
+++ b/test/integration/goldens/iam/com/google/iam/v1/package-info.java
@@ -45,6 +45,8 @@
  * 
Sample for IAMPolicyClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (IAMPolicyClient iAMPolicyClient = IAMPolicyClient.create()) {
  *   SetIamPolicyRequest request =
  *       SetIamPolicyRequest.newBuilder()
diff --git a/test/integration/goldens/iam/com/google/iam/v1/stub/IAMPolicyStubSettings.java b/test/integration/goldens/iam/com/google/iam/v1/stub/IAMPolicyStubSettings.java
index ebeea7772d..063e2c605d 100644
--- a/test/integration/goldens/iam/com/google/iam/v1/stub/IAMPolicyStubSettings.java
+++ b/test/integration/goldens/iam/com/google/iam/v1/stub/IAMPolicyStubSettings.java
@@ -63,6 +63,8 @@
  * 
For example, to set the total timeout of setIamPolicy to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * IAMPolicyStubSettings.Builder iAMPolicySettingsBuilder = IAMPolicyStubSettings.newBuilder();
  * iAMPolicySettingsBuilder
  *     .setIamPolicySettings()
diff --git a/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceClient.java b/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceClient.java
index 6dfc6544ea..7edd77bdc4 100644
--- a/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceClient.java
+++ b/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceClient.java
@@ -65,6 +65,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (KeyManagementServiceClient keyManagementServiceClient =
  *     KeyManagementServiceClient.create()) {
  *   KeyRingName name = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]");
@@ -102,6 +104,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * KeyManagementServiceSettings keyManagementServiceSettings =
  *     KeyManagementServiceSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -113,6 +117,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * KeyManagementServiceSettings keyManagementServiceSettings =
  *     KeyManagementServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
  * KeyManagementServiceClient keyManagementServiceClient =
@@ -181,6 +187,8 @@ public KeyManagementServiceStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
@@ -209,6 +217,8 @@ public final ListKeyRingsPagedResponse listKeyRings(LocationName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent = LocationName.of("[PROJECT]", "[LOCATION]").toString();
@@ -234,6 +244,8 @@ public final ListKeyRingsPagedResponse listKeyRings(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListKeyRingsRequest request =
@@ -264,6 +276,8 @@ public final ListKeyRingsPagedResponse listKeyRings(ListKeyRingsRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListKeyRingsRequest request =
@@ -295,6 +309,8 @@ public final ListKeyRingsPagedResponse listKeyRings(ListKeyRingsRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListKeyRingsRequest request =
@@ -332,6 +348,8 @@ public final UnaryCallable listKeyRin
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   KeyRingName parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]");
@@ -360,6 +378,8 @@ public final ListCryptoKeysPagedResponse listCryptoKeys(KeyRingName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]").toString();
@@ -385,6 +405,8 @@ public final ListCryptoKeysPagedResponse listCryptoKeys(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListCryptoKeysRequest request =
@@ -415,6 +437,8 @@ public final ListCryptoKeysPagedResponse listCryptoKeys(ListCryptoKeysRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListCryptoKeysRequest request =
@@ -446,6 +470,8 @@ public final ListCryptoKeysPagedResponse listCryptoKeys(ListCryptoKeysRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListCryptoKeysRequest request =
@@ -484,6 +510,8 @@ public final ListCryptoKeysPagedResponse listCryptoKeys(ListCryptoKeysRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyName parent =
@@ -514,6 +542,8 @@ public final ListCryptoKeyVersionsPagedResponse listCryptoKeyVersions(CryptoKeyN
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent =
@@ -542,6 +572,8 @@ public final ListCryptoKeyVersionsPagedResponse listCryptoKeyVersions(String par
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListCryptoKeyVersionsRequest request =
@@ -576,6 +608,8 @@ public final ListCryptoKeyVersionsPagedResponse listCryptoKeyVersions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListCryptoKeyVersionsRequest request =
@@ -609,6 +643,8 @@ public final ListCryptoKeyVersionsPagedResponse listCryptoKeyVersions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListCryptoKeyVersionsRequest request =
@@ -649,6 +685,8 @@ public final ListCryptoKeyVersionsPagedResponse listCryptoKeyVersions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   KeyRingName parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]");
@@ -677,6 +715,8 @@ public final ListImportJobsPagedResponse listImportJobs(KeyRingName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]").toString();
@@ -702,6 +742,8 @@ public final ListImportJobsPagedResponse listImportJobs(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListImportJobsRequest request =
@@ -732,6 +774,8 @@ public final ListImportJobsPagedResponse listImportJobs(ListImportJobsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListImportJobsRequest request =
@@ -763,6 +807,8 @@ public final ListImportJobsPagedResponse listImportJobs(ListImportJobsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListImportJobsRequest request =
@@ -801,6 +847,8 @@ public final ListImportJobsPagedResponse listImportJobs(ListImportJobsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   KeyRingName name = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]");
@@ -825,6 +873,8 @@ public final KeyRing getKeyRing(KeyRingName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]").toString();
@@ -848,6 +898,8 @@ public final KeyRing getKeyRing(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetKeyRingRequest request =
@@ -872,6 +924,8 @@ public final KeyRing getKeyRing(GetKeyRingRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetKeyRingRequest request =
@@ -898,6 +952,8 @@ public final UnaryCallable getKeyRingCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyName name =
@@ -925,6 +981,8 @@ public final CryptoKey getCryptoKey(CryptoKeyName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -951,6 +1009,8 @@ public final CryptoKey getCryptoKey(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetCryptoKeyRequest request =
@@ -979,6 +1039,8 @@ public final CryptoKey getCryptoKey(GetCryptoKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetCryptoKeyRequest request =
@@ -1005,6 +1067,8 @@ public final UnaryCallable getCryptoKeyCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyVersionName name =
@@ -1033,6 +1097,8 @@ public final CryptoKeyVersion getCryptoKeyVersion(CryptoKeyVersionName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -1060,6 +1126,8 @@ public final CryptoKeyVersion getCryptoKeyVersion(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetCryptoKeyVersionRequest request =
@@ -1091,6 +1159,8 @@ public final CryptoKeyVersion getCryptoKeyVersion(GetCryptoKeyVersionRequest req
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetCryptoKeyVersionRequest request =
@@ -1126,6 +1196,8 @@ public final CryptoKeyVersion getCryptoKeyVersion(GetCryptoKeyVersionRequest req
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyVersionName name =
@@ -1155,6 +1227,8 @@ public final PublicKey getPublicKey(CryptoKeyVersionName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -1184,6 +1258,8 @@ public final PublicKey getPublicKey(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetPublicKeyRequest request =
@@ -1218,6 +1294,8 @@ public final PublicKey getPublicKey(GetPublicKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetPublicKeyRequest request =
@@ -1249,6 +1327,8 @@ public final UnaryCallable getPublicKeyCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ImportJobName name =
@@ -1274,6 +1354,8 @@ public final ImportJob getImportJob(ImportJobName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -1298,6 +1380,8 @@ public final ImportJob getImportJob(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetImportJobRequest request =
@@ -1324,6 +1408,8 @@ public final ImportJob getImportJob(GetImportJobRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetImportJobRequest request =
@@ -1350,6 +1436,8 @@ public final UnaryCallable getImportJobCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
@@ -1383,6 +1471,8 @@ public final KeyRing createKeyRing(LocationName parent, String keyRingId, KeyRin
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent = LocationName.of("[PROJECT]", "[LOCATION]").toString();
@@ -1416,6 +1506,8 @@ public final KeyRing createKeyRing(String parent, String keyRingId, KeyRing keyR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateKeyRingRequest request =
@@ -1442,6 +1534,8 @@ public final KeyRing createKeyRing(CreateKeyRingRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateKeyRingRequest request =
@@ -1473,6 +1567,8 @@ public final UnaryCallable createKeyRingCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   KeyRingName parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]");
@@ -1514,6 +1610,8 @@ public final CryptoKey createCryptoKey(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]").toString();
@@ -1554,6 +1652,8 @@ public final CryptoKey createCryptoKey(String parent, String cryptoKeyId, Crypto
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateCryptoKeyRequest request =
@@ -1586,6 +1686,8 @@ public final CryptoKey createCryptoKey(CreateCryptoKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateCryptoKeyRequest request =
@@ -1618,6 +1720,8 @@ public final UnaryCallable createCryptoKeyCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyName parent =
@@ -1657,6 +1761,8 @@ public final CryptoKeyVersion createCryptoKeyVersion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent =
@@ -1696,6 +1802,8 @@ public final CryptoKeyVersion createCryptoKeyVersion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateCryptoKeyVersionRequest request =
@@ -1728,6 +1836,8 @@ public final CryptoKeyVersion createCryptoKeyVersion(CreateCryptoKeyVersionReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateCryptoKeyVersionRequest request =
@@ -1761,6 +1871,8 @@ public final CryptoKeyVersion createCryptoKeyVersion(CreateCryptoKeyVersionReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ImportCryptoKeyVersionRequest request =
@@ -1793,6 +1905,8 @@ public final CryptoKeyVersion importCryptoKeyVersion(ImportCryptoKeyVersionReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ImportCryptoKeyVersionRequest request =
@@ -1824,6 +1938,8 @@ public final CryptoKeyVersion importCryptoKeyVersion(ImportCryptoKeyVersionReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   KeyRingName parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]");
@@ -1864,6 +1980,8 @@ public final ImportJob createImportJob(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String parent = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]").toString();
@@ -1903,6 +2021,8 @@ public final ImportJob createImportJob(String parent, String importJobId, Import
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateImportJobRequest request =
@@ -1932,6 +2052,8 @@ public final ImportJob createImportJob(CreateImportJobRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CreateImportJobRequest request =
@@ -1958,6 +2080,8 @@ public final UnaryCallable createImportJobCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKey cryptoKey = CryptoKey.newBuilder().build();
@@ -1986,6 +2110,8 @@ public final CryptoKey updateCryptoKey(CryptoKey cryptoKey, FieldMask updateMask
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   UpdateCryptoKeyRequest request =
@@ -2011,6 +2137,8 @@ public final CryptoKey updateCryptoKey(UpdateCryptoKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   UpdateCryptoKeyRequest request =
@@ -2044,6 +2172,8 @@ public final UnaryCallable updateCryptoKeyCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyVersion cryptoKeyVersion = CryptoKeyVersion.newBuilder().build();
@@ -2083,6 +2213,8 @@ public final CryptoKeyVersion updateCryptoKeyVersion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   UpdateCryptoKeyVersionRequest request =
@@ -2116,6 +2248,8 @@ public final CryptoKeyVersion updateCryptoKeyVersion(UpdateCryptoKeyVersionReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   UpdateCryptoKeyVersionRequest request =
@@ -2145,6 +2279,8 @@ public final CryptoKeyVersion updateCryptoKeyVersion(UpdateCryptoKeyVersionReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ResourceName name = CryptoKeyName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]", "[CRYPTO_KEY]");
@@ -2185,6 +2321,8 @@ public final EncryptResponse encrypt(ResourceName name, ByteString plaintext) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -2223,6 +2361,8 @@ public final EncryptResponse encrypt(String name, ByteString plaintext) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   EncryptRequest request =
@@ -2256,6 +2396,8 @@ public final EncryptResponse encrypt(EncryptRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   EncryptRequest request =
@@ -2289,6 +2431,8 @@ public final UnaryCallable encryptCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyName name =
@@ -2323,6 +2467,8 @@ public final DecryptResponse decrypt(CryptoKeyName name, ByteString ciphertext)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -2354,6 +2500,8 @@ public final DecryptResponse decrypt(String name, ByteString ciphertext) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   DecryptRequest request =
@@ -2387,6 +2535,8 @@ public final DecryptResponse decrypt(DecryptRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   DecryptRequest request =
@@ -2420,6 +2570,8 @@ public final UnaryCallable decryptCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyVersionName name =
@@ -2456,6 +2608,8 @@ public final AsymmetricSignResponse asymmetricSign(CryptoKeyVersionName name, Di
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -2490,6 +2644,8 @@ public final AsymmetricSignResponse asymmetricSign(String name, Digest digest) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   AsymmetricSignRequest request =
@@ -2526,6 +2682,8 @@ public final AsymmetricSignResponse asymmetricSign(AsymmetricSignRequest request
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   AsymmetricSignRequest request =
@@ -2563,6 +2721,8 @@ public final AsymmetricSignResponse asymmetricSign(AsymmetricSignRequest request
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyVersionName name =
@@ -2600,6 +2760,8 @@ public final AsymmetricDecryptResponse asymmetricDecrypt(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -2634,6 +2796,8 @@ public final AsymmetricDecryptResponse asymmetricDecrypt(String name, ByteString
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   AsymmetricDecryptRequest request =
@@ -2670,6 +2834,8 @@ public final AsymmetricDecryptResponse asymmetricDecrypt(AsymmetricDecryptReques
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   AsymmetricDecryptRequest request =
@@ -2707,6 +2873,8 @@ public final AsymmetricDecryptResponse asymmetricDecrypt(AsymmetricDecryptReques
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyName name =
@@ -2743,6 +2911,8 @@ public final CryptoKey updateCryptoKeyPrimaryVersion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -2778,6 +2948,8 @@ public final CryptoKey updateCryptoKeyPrimaryVersion(String name, String cryptoK
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   UpdateCryptoKeyPrimaryVersionRequest request =
@@ -2809,6 +2981,8 @@ public final CryptoKey updateCryptoKeyPrimaryVersion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   UpdateCryptoKeyPrimaryVersionRequest request =
@@ -2850,6 +3024,8 @@ public final CryptoKey updateCryptoKeyPrimaryVersion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyVersionName name =
@@ -2891,6 +3067,8 @@ public final CryptoKeyVersion destroyCryptoKeyVersion(CryptoKeyVersionName name)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -2931,6 +3109,8 @@ public final CryptoKeyVersion destroyCryptoKeyVersion(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   DestroyCryptoKeyVersionRequest request =
@@ -2975,6 +3155,8 @@ public final CryptoKeyVersion destroyCryptoKeyVersion(DestroyCryptoKeyVersionReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   DestroyCryptoKeyVersionRequest request =
@@ -3014,6 +3196,8 @@ public final CryptoKeyVersion destroyCryptoKeyVersion(DestroyCryptoKeyVersionReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   CryptoKeyVersionName name =
@@ -3049,6 +3233,8 @@ public final CryptoKeyVersion restoreCryptoKeyVersion(CryptoKeyVersionName name)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   String name =
@@ -3083,6 +3269,8 @@ public final CryptoKeyVersion restoreCryptoKeyVersion(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   RestoreCryptoKeyVersionRequest request =
@@ -3121,6 +3309,8 @@ public final CryptoKeyVersion restoreCryptoKeyVersion(RestoreCryptoKeyVersionReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   RestoreCryptoKeyVersionRequest request =
@@ -3154,6 +3344,8 @@ public final CryptoKeyVersion restoreCryptoKeyVersion(RestoreCryptoKeyVersionReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetIamPolicyRequest request =
@@ -3182,6 +3374,8 @@ public final Policy getIamPolicy(GetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetIamPolicyRequest request =
@@ -3209,6 +3403,8 @@ public final UnaryCallable getIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListLocationsRequest request =
@@ -3238,6 +3434,8 @@ public final ListLocationsPagedResponse listLocations(ListLocationsRequest reque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListLocationsRequest request =
@@ -3268,6 +3466,8 @@ public final ListLocationsPagedResponse listLocations(ListLocationsRequest reque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   ListLocationsRequest request =
@@ -3304,6 +3504,8 @@ public final UnaryCallable listLoca
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetLocationRequest request = GetLocationRequest.newBuilder().setName("name3373707").build();
@@ -3325,6 +3527,8 @@ public final Location getLocation(GetLocationRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   GetLocationRequest request = GetLocationRequest.newBuilder().setName("name3373707").build();
@@ -3347,6 +3551,8 @@ public final UnaryCallable getLocationCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   TestIamPermissionsRequest request =
@@ -3375,6 +3581,8 @@ public final TestIamPermissionsResponse testIamPermissions(TestIamPermissionsReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (KeyManagementServiceClient keyManagementServiceClient =
    *     KeyManagementServiceClient.create()) {
    *   TestIamPermissionsRequest request =
diff --git a/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceSettings.java b/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceSettings.java
index 3d141418d1..2b750af8a7 100644
--- a/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceSettings.java
+++ b/test/integration/goldens/kms/com/google/cloud/kms/v1/KeyManagementServiceSettings.java
@@ -65,6 +65,8 @@
  * 
For example, to set the total timeout of getKeyRing to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * KeyManagementServiceSettings.Builder keyManagementServiceSettingsBuilder =
  *     KeyManagementServiceSettings.newBuilder();
  * keyManagementServiceSettingsBuilder
diff --git a/test/integration/goldens/kms/com/google/cloud/kms/v1/package-info.java b/test/integration/goldens/kms/com/google/cloud/kms/v1/package-info.java
index 879e6a2d3a..fc9d5ed30f 100644
--- a/test/integration/goldens/kms/com/google/cloud/kms/v1/package-info.java
+++ b/test/integration/goldens/kms/com/google/cloud/kms/v1/package-info.java
@@ -39,6 +39,8 @@
  * 
Sample for KeyManagementServiceClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (KeyManagementServiceClient keyManagementServiceClient =
  *     KeyManagementServiceClient.create()) {
  *   KeyRingName name = KeyRingName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]");
diff --git a/test/integration/goldens/kms/com/google/cloud/kms/v1/stub/KeyManagementServiceStubSettings.java b/test/integration/goldens/kms/com/google/cloud/kms/v1/stub/KeyManagementServiceStubSettings.java
index a403a36e42..5c5f66fd26 100644
--- a/test/integration/goldens/kms/com/google/cloud/kms/v1/stub/KeyManagementServiceStubSettings.java
+++ b/test/integration/goldens/kms/com/google/cloud/kms/v1/stub/KeyManagementServiceStubSettings.java
@@ -115,6 +115,8 @@
  * 
For example, to set the total timeout of getKeyRing to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * KeyManagementServiceStubSettings.Builder keyManagementServiceSettingsBuilder =
  *     KeyManagementServiceStubSettings.newBuilder();
  * keyManagementServiceSettingsBuilder
diff --git a/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceClient.java b/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceClient.java
index 5efedbb486..ca7865e600 100644
--- a/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceClient.java
+++ b/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceClient.java
@@ -67,6 +67,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
  *   Shelf shelf = Shelf.newBuilder().build();
  *   Shelf response = libraryServiceClient.createShelf(shelf);
@@ -102,6 +104,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LibraryServiceSettings libraryServiceSettings =
  *     LibraryServiceSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -112,6 +116,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LibraryServiceSettings libraryServiceSettings =
  *     LibraryServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
  * LibraryServiceClient libraryServiceClient = LibraryServiceClient.create(libraryServiceSettings);
@@ -179,6 +185,8 @@ public LibraryServiceStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   Shelf shelf = Shelf.newBuilder().build();
    *   Shelf response = libraryServiceClient.createShelf(shelf);
@@ -200,6 +208,8 @@ public final Shelf createShelf(Shelf shelf) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   CreateShelfRequest request =
    *       CreateShelfRequest.newBuilder().setShelf(Shelf.newBuilder().build()).build();
@@ -221,6 +231,8 @@ public final Shelf createShelf(CreateShelfRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   CreateShelfRequest request =
    *       CreateShelfRequest.newBuilder().setShelf(Shelf.newBuilder().build()).build();
@@ -241,6 +253,8 @@ public final UnaryCallable createShelfCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ShelfName name = ShelfName.of("[SHELF_ID]");
    *   Shelf response = libraryServiceClient.getShelf(name);
@@ -263,6 +277,8 @@ public final Shelf getShelf(ShelfName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = ShelfName.of("[SHELF_ID]").toString();
    *   Shelf response = libraryServiceClient.getShelf(name);
@@ -284,6 +300,8 @@ public final Shelf getShelf(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   GetShelfRequest request =
    *       GetShelfRequest.newBuilder().setName(ShelfName.of("[SHELF_ID]").toString()).build();
@@ -305,6 +323,8 @@ public final Shelf getShelf(GetShelfRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   GetShelfRequest request =
    *       GetShelfRequest.newBuilder().setName(ShelfName.of("[SHELF_ID]").toString()).build();
@@ -326,6 +346,8 @@ public final UnaryCallable getShelfCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ListShelvesRequest request =
    *       ListShelvesRequest.newBuilder()
@@ -353,6 +375,8 @@ public final ListShelvesPagedResponse listShelves(ListShelvesRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ListShelvesRequest request =
    *       ListShelvesRequest.newBuilder()
@@ -380,6 +404,8 @@ public final ListShelvesPagedResponse listShelves(ListShelvesRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ListShelvesRequest request =
    *       ListShelvesRequest.newBuilder()
@@ -412,6 +438,8 @@ public final UnaryCallable listShelvesC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ShelfName name = ShelfName.of("[SHELF_ID]");
    *   libraryServiceClient.deleteShelf(name);
@@ -434,6 +462,8 @@ public final void deleteShelf(ShelfName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = ShelfName.of("[SHELF_ID]").toString();
    *   libraryServiceClient.deleteShelf(name);
@@ -455,6 +485,8 @@ public final void deleteShelf(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   DeleteShelfRequest request =
    *       DeleteShelfRequest.newBuilder().setName(ShelfName.of("[SHELF_ID]").toString()).build();
@@ -476,6 +508,8 @@ public final void deleteShelf(DeleteShelfRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   DeleteShelfRequest request =
    *       DeleteShelfRequest.newBuilder().setName(ShelfName.of("[SHELF_ID]").toString()).build();
@@ -501,6 +535,8 @@ public final UnaryCallable deleteShelfCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ShelfName name = ShelfName.of("[SHELF_ID]");
    *   ShelfName otherShelf = ShelfName.of("[SHELF_ID]");
@@ -533,6 +569,8 @@ public final Shelf mergeShelves(ShelfName name, ShelfName otherShelf) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ShelfName name = ShelfName.of("[SHELF_ID]");
    *   String otherShelf = ShelfName.of("[SHELF_ID]").toString();
@@ -565,6 +603,8 @@ public final Shelf mergeShelves(ShelfName name, String otherShelf) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = ShelfName.of("[SHELF_ID]").toString();
    *   ShelfName otherShelf = ShelfName.of("[SHELF_ID]");
@@ -597,6 +637,8 @@ public final Shelf mergeShelves(String name, ShelfName otherShelf) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = ShelfName.of("[SHELF_ID]").toString();
    *   String otherShelf = ShelfName.of("[SHELF_ID]").toString();
@@ -626,6 +668,8 @@ public final Shelf mergeShelves(String name, String otherShelf) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   MergeShelvesRequest request =
    *       MergeShelvesRequest.newBuilder()
@@ -655,6 +699,8 @@ public final Shelf mergeShelves(MergeShelvesRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   MergeShelvesRequest request =
    *       MergeShelvesRequest.newBuilder()
@@ -678,6 +724,8 @@ public final UnaryCallable mergeShelvesCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ShelfName parent = ShelfName.of("[SHELF_ID]");
    *   Book book = Book.newBuilder().build();
@@ -705,6 +753,8 @@ public final Book createBook(ShelfName parent, Book book) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String parent = ShelfName.of("[SHELF_ID]").toString();
    *   Book book = Book.newBuilder().build();
@@ -729,6 +779,8 @@ public final Book createBook(String parent, Book book) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   CreateBookRequest request =
    *       CreateBookRequest.newBuilder()
@@ -753,6 +805,8 @@ public final Book createBook(CreateBookRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   CreateBookRequest request =
    *       CreateBookRequest.newBuilder()
@@ -776,6 +830,8 @@ public final UnaryCallable createBookCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   BookName name = BookName.of("[SHELF]", "[BOOK]");
    *   Book response = libraryServiceClient.getBook(name);
@@ -798,6 +854,8 @@ public final Book getBook(BookName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = BookName.of("[SHELF]", "[BOOK]").toString();
    *   Book response = libraryServiceClient.getBook(name);
@@ -819,6 +877,8 @@ public final Book getBook(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   GetBookRequest request =
    *       GetBookRequest.newBuilder().setName(BookName.of("[SHELF]", "[BOOK]").toString()).build();
@@ -840,6 +900,8 @@ public final Book getBook(GetBookRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   GetBookRequest request =
    *       GetBookRequest.newBuilder().setName(BookName.of("[SHELF]", "[BOOK]").toString()).build();
@@ -862,6 +924,8 @@ public final UnaryCallable getBookCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ShelfName parent = ShelfName.of("[SHELF_ID]");
    *   for (Book element : libraryServiceClient.listBooks(parent).iterateAll()) {
@@ -888,6 +952,8 @@ public final ListBooksPagedResponse listBooks(ShelfName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String parent = ShelfName.of("[SHELF_ID]").toString();
    *   for (Book element : libraryServiceClient.listBooks(parent).iterateAll()) {
@@ -913,6 +979,8 @@ public final ListBooksPagedResponse listBooks(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ListBooksRequest request =
    *       ListBooksRequest.newBuilder()
@@ -942,6 +1010,8 @@ public final ListBooksPagedResponse listBooks(ListBooksRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ListBooksRequest request =
    *       ListBooksRequest.newBuilder()
@@ -970,6 +1040,8 @@ public final UnaryCallable listBooksPa
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   ListBooksRequest request =
    *       ListBooksRequest.newBuilder()
@@ -1003,6 +1075,8 @@ public final UnaryCallable listBooksCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   BookName name = BookName.of("[SHELF]", "[BOOK]");
    *   libraryServiceClient.deleteBook(name);
@@ -1025,6 +1099,8 @@ public final void deleteBook(BookName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = BookName.of("[SHELF]", "[BOOK]").toString();
    *   libraryServiceClient.deleteBook(name);
@@ -1046,6 +1122,8 @@ public final void deleteBook(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   DeleteBookRequest request =
    *       DeleteBookRequest.newBuilder()
@@ -1069,6 +1147,8 @@ public final void deleteBook(DeleteBookRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   DeleteBookRequest request =
    *       DeleteBookRequest.newBuilder()
@@ -1092,6 +1172,8 @@ public final UnaryCallable deleteBookCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   Book book = Book.newBuilder().build();
    *   FieldMask updateMask = FieldMask.newBuilder().build();
@@ -1117,6 +1199,8 @@ public final Book updateBook(Book book, FieldMask updateMask) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   UpdateBookRequest request =
    *       UpdateBookRequest.newBuilder()
@@ -1142,6 +1226,8 @@ public final Book updateBook(UpdateBookRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   UpdateBookRequest request =
    *       UpdateBookRequest.newBuilder()
@@ -1166,6 +1252,8 @@ public final UnaryCallable updateBookCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   BookName name = BookName.of("[SHELF]", "[BOOK]");
    *   ShelfName otherShelfName = ShelfName.of("[SHELF_ID]");
@@ -1194,6 +1282,8 @@ public final Book moveBook(BookName name, ShelfName otherShelfName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   BookName name = BookName.of("[SHELF]", "[BOOK]");
    *   String otherShelfName = ShelfName.of("[SHELF_ID]").toString();
@@ -1222,6 +1312,8 @@ public final Book moveBook(BookName name, String otherShelfName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = BookName.of("[SHELF]", "[BOOK]").toString();
    *   ShelfName otherShelfName = ShelfName.of("[SHELF_ID]");
@@ -1250,6 +1342,8 @@ public final Book moveBook(String name, ShelfName otherShelfName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   String name = BookName.of("[SHELF]", "[BOOK]").toString();
    *   String otherShelfName = ShelfName.of("[SHELF_ID]").toString();
@@ -1275,6 +1369,8 @@ public final Book moveBook(String name, String otherShelfName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   MoveBookRequest request =
    *       MoveBookRequest.newBuilder()
@@ -1300,6 +1396,8 @@ public final Book moveBook(MoveBookRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
    *   MoveBookRequest request =
    *       MoveBookRequest.newBuilder()
diff --git a/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceSettings.java b/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceSettings.java
index 990cf2ad5d..7e09a81049 100644
--- a/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceSettings.java
+++ b/test/integration/goldens/library/com/google/cloud/example/library/v1/LibraryServiceSettings.java
@@ -71,6 +71,8 @@
  * 
For example, to set the total timeout of createShelf to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LibraryServiceSettings.Builder libraryServiceSettingsBuilder =
  *     LibraryServiceSettings.newBuilder();
  * libraryServiceSettingsBuilder
diff --git a/test/integration/goldens/library/com/google/cloud/example/library/v1/package-info.java b/test/integration/goldens/library/com/google/cloud/example/library/v1/package-info.java
index f211c32606..91c711a30b 100644
--- a/test/integration/goldens/library/com/google/cloud/example/library/v1/package-info.java
+++ b/test/integration/goldens/library/com/google/cloud/example/library/v1/package-info.java
@@ -31,6 +31,8 @@
  * 
Sample for LibraryServiceClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
  *   Shelf shelf = Shelf.newBuilder().build();
  *   Shelf response = libraryServiceClient.createShelf(shelf);
diff --git a/test/integration/goldens/library/com/google/cloud/example/library/v1/stub/LibraryServiceStubSettings.java b/test/integration/goldens/library/com/google/cloud/example/library/v1/stub/LibraryServiceStubSettings.java
index 1016c03496..c12c6876f7 100644
--- a/test/integration/goldens/library/com/google/cloud/example/library/v1/stub/LibraryServiceStubSettings.java
+++ b/test/integration/goldens/library/com/google/cloud/example/library/v1/stub/LibraryServiceStubSettings.java
@@ -85,6 +85,8 @@
  * 
For example, to set the total timeout of createShelf to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LibraryServiceStubSettings.Builder libraryServiceSettingsBuilder =
  *     LibraryServiceStubSettings.newBuilder();
  * libraryServiceSettingsBuilder
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigClient.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigClient.java
index dd94562e23..f4e4fd0932 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigClient.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigClient.java
@@ -85,6 +85,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (ConfigClient configClient = ConfigClient.create()) {
  *   GetBucketRequest request =
  *       GetBucketRequest.newBuilder()
@@ -125,6 +127,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * ConfigSettings configSettings =
  *     ConfigSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -135,6 +139,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * ConfigSettings configSettings = ConfigSettings.newBuilder().setEndpoint(myEndpoint).build();
  * ConfigClient configClient = ConfigClient.create(configSettings);
  * }

@@ -199,6 +205,8 @@ public ConfigServiceV2Stub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   BillingAccountLocationName parent =
    *       BillingAccountLocationName.of("[BILLING_ACCOUNT]", "[LOCATION]");
@@ -232,6 +240,8 @@ public final ListBucketsPagedResponse listBuckets(BillingAccountLocationName par
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   FolderLocationName parent = FolderLocationName.of("[FOLDER]", "[LOCATION]");
    *   for (LogBucket element : configClient.listBuckets(parent).iterateAll()) {
@@ -264,6 +274,8 @@ public final ListBucketsPagedResponse listBuckets(FolderLocationName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
    *   for (LogBucket element : configClient.listBuckets(parent).iterateAll()) {
@@ -296,6 +308,8 @@ public final ListBucketsPagedResponse listBuckets(LocationName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   OrganizationLocationName parent = OrganizationLocationName.of("[ORGANIZATION]", "[LOCATION]");
    *   for (LogBucket element : configClient.listBuckets(parent).iterateAll()) {
@@ -328,6 +342,8 @@ public final ListBucketsPagedResponse listBuckets(OrganizationLocationName paren
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String parent = LocationName.of("[PROJECT]", "[LOCATION]").toString();
    *   for (LogBucket element : configClient.listBuckets(parent).iterateAll()) {
@@ -357,6 +373,8 @@ public final ListBucketsPagedResponse listBuckets(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListBucketsRequest request =
    *       ListBucketsRequest.newBuilder()
@@ -384,6 +402,8 @@ public final ListBucketsPagedResponse listBuckets(ListBucketsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListBucketsRequest request =
    *       ListBucketsRequest.newBuilder()
@@ -411,6 +431,8 @@ public final ListBucketsPagedResponse listBuckets(ListBucketsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListBucketsRequest request =
    *       ListBucketsRequest.newBuilder()
@@ -444,6 +466,8 @@ public final UnaryCallable listBucketsC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetBucketRequest request =
    *       GetBucketRequest.newBuilder()
@@ -469,6 +493,8 @@ public final LogBucket getBucket(GetBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetBucketRequest request =
    *       GetBucketRequest.newBuilder()
@@ -494,6 +520,8 @@ public final UnaryCallable getBucketCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateBucketRequest request =
    *       CreateBucketRequest.newBuilder()
@@ -520,6 +548,8 @@ public final LogBucket createBucket(CreateBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateBucketRequest request =
    *       CreateBucketRequest.newBuilder()
@@ -553,6 +583,8 @@ public final UnaryCallable createBucketCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateBucketRequest request =
    *       UpdateBucketRequest.newBuilder()
@@ -589,6 +621,8 @@ public final LogBucket updateBucket(UpdateBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateBucketRequest request =
    *       UpdateBucketRequest.newBuilder()
@@ -616,6 +650,8 @@ public final UnaryCallable updateBucketCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteBucketRequest request =
    *       DeleteBucketRequest.newBuilder()
@@ -642,6 +678,8 @@ public final void deleteBucket(DeleteBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteBucketRequest request =
    *       DeleteBucketRequest.newBuilder()
@@ -667,6 +705,8 @@ public final UnaryCallable deleteBucketCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UndeleteBucketRequest request =
    *       UndeleteBucketRequest.newBuilder()
@@ -693,6 +733,8 @@ public final void undeleteBucket(UndeleteBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UndeleteBucketRequest request =
    *       UndeleteBucketRequest.newBuilder()
@@ -717,6 +759,8 @@ public final UnaryCallable undeleteBucketCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String parent = "parent-995424086";
    *   for (LogView element : configClient.listViews(parent).iterateAll()) {
@@ -741,6 +785,8 @@ public final ListViewsPagedResponse listViews(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListViewsRequest request =
    *       ListViewsRequest.newBuilder()
@@ -768,6 +814,8 @@ public final ListViewsPagedResponse listViews(ListViewsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListViewsRequest request =
    *       ListViewsRequest.newBuilder()
@@ -794,6 +842,8 @@ public final UnaryCallable listViewsPa
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListViewsRequest request =
    *       ListViewsRequest.newBuilder()
@@ -827,6 +877,8 @@ public final UnaryCallable listViewsCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetViewRequest request =
    *       GetViewRequest.newBuilder()
@@ -853,6 +905,8 @@ public final LogView getView(GetViewRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetViewRequest request =
    *       GetViewRequest.newBuilder()
@@ -878,6 +932,8 @@ public final UnaryCallable getViewCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateViewRequest request =
    *       CreateViewRequest.newBuilder()
@@ -903,6 +959,8 @@ public final LogView createView(CreateViewRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateViewRequest request =
    *       CreateViewRequest.newBuilder()
@@ -928,6 +986,8 @@ public final UnaryCallable createViewCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateViewRequest request =
    *       UpdateViewRequest.newBuilder()
@@ -954,6 +1014,8 @@ public final LogView updateView(UpdateViewRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateViewRequest request =
    *       UpdateViewRequest.newBuilder()
@@ -978,6 +1040,8 @@ public final UnaryCallable updateViewCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteViewRequest request =
    *       DeleteViewRequest.newBuilder()
@@ -1004,6 +1068,8 @@ public final void deleteView(DeleteViewRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteViewRequest request =
    *       DeleteViewRequest.newBuilder()
@@ -1029,6 +1095,8 @@ public final UnaryCallable deleteViewCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
    *   for (LogSink element : configClient.listSinks(parent).iterateAll()) {
@@ -1055,6 +1123,8 @@ public final ListSinksPagedResponse listSinks(BillingAccountName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   FolderName parent = FolderName.of("[FOLDER]");
    *   for (LogSink element : configClient.listSinks(parent).iterateAll()) {
@@ -1081,6 +1151,8 @@ public final ListSinksPagedResponse listSinks(FolderName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   OrganizationName parent = OrganizationName.of("[ORGANIZATION]");
    *   for (LogSink element : configClient.listSinks(parent).iterateAll()) {
@@ -1107,6 +1179,8 @@ public final ListSinksPagedResponse listSinks(OrganizationName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (LogSink element : configClient.listSinks(parent).iterateAll()) {
@@ -1133,6 +1207,8 @@ public final ListSinksPagedResponse listSinks(ProjectName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (LogSink element : configClient.listSinks(parent).iterateAll()) {
@@ -1158,6 +1234,8 @@ public final ListSinksPagedResponse listSinks(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListSinksRequest request =
    *       ListSinksRequest.newBuilder()
@@ -1185,6 +1263,8 @@ public final ListSinksPagedResponse listSinks(ListSinksRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListSinksRequest request =
    *       ListSinksRequest.newBuilder()
@@ -1211,6 +1291,8 @@ public final UnaryCallable listSinksPa
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListSinksRequest request =
    *       ListSinksRequest.newBuilder()
@@ -1244,6 +1326,8 @@ public final UnaryCallable listSinksCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
    *   LogSink response = configClient.getSink(sinkName);
@@ -1273,6 +1357,8 @@ public final LogSink getSink(LogSinkName sinkName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]").toString();
    *   LogSink response = configClient.getSink(sinkName);
@@ -1299,6 +1385,8 @@ public final LogSink getSink(String sinkName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetSinkRequest request =
    *       GetSinkRequest.newBuilder()
@@ -1322,6 +1410,8 @@ public final LogSink getSink(GetSinkRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetSinkRequest request =
    *       GetSinkRequest.newBuilder()
@@ -1347,6 +1437,8 @@ public final UnaryCallable getSinkCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1381,6 +1473,8 @@ public final LogSink createSink(BillingAccountName parent, LogSink sink) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   FolderName parent = FolderName.of("[FOLDER]");
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1415,6 +1509,8 @@ public final LogSink createSink(FolderName parent, LogSink sink) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   OrganizationName parent = OrganizationName.of("[ORGANIZATION]");
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1449,6 +1545,8 @@ public final LogSink createSink(OrganizationName parent, LogSink sink) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1483,6 +1581,8 @@ public final LogSink createSink(ProjectName parent, LogSink sink) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1514,6 +1614,8 @@ public final LogSink createSink(String parent, LogSink sink) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateSinkRequest request =
    *       CreateSinkRequest.newBuilder()
@@ -1542,6 +1644,8 @@ public final LogSink createSink(CreateSinkRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateSinkRequest request =
    *       CreateSinkRequest.newBuilder()
@@ -1570,6 +1674,8 @@ public final UnaryCallable createSinkCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1608,6 +1714,8 @@ public final LogSink updateSink(LogSinkName sinkName, LogSink sink) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]").toString();
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1643,6 +1751,8 @@ public final LogSink updateSink(String sinkName, LogSink sink) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1692,6 +1802,8 @@ public final LogSink updateSink(LogSinkName sinkName, LogSink sink, FieldMask up
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]").toString();
    *   LogSink sink = LogSink.newBuilder().build();
@@ -1741,6 +1853,8 @@ public final LogSink updateSink(String sinkName, LogSink sink, FieldMask updateM
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateSinkRequest request =
    *       UpdateSinkRequest.newBuilder()
@@ -1771,6 +1885,8 @@ public final LogSink updateSink(UpdateSinkRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateSinkRequest request =
    *       UpdateSinkRequest.newBuilder()
@@ -1797,6 +1913,8 @@ public final UnaryCallable updateSinkCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
    *   configClient.deleteSink(sinkName);
@@ -1828,6 +1946,8 @@ public final void deleteSink(LogSinkName sinkName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]").toString();
    *   configClient.deleteSink(sinkName);
@@ -1856,6 +1976,8 @@ public final void deleteSink(String sinkName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteSinkRequest request =
    *       DeleteSinkRequest.newBuilder()
@@ -1880,6 +2002,8 @@ public final void deleteSink(DeleteSinkRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteSinkRequest request =
    *       DeleteSinkRequest.newBuilder()
@@ -1902,6 +2026,8 @@ public final UnaryCallable deleteSinkCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
    *   for (LogExclusion element : configClient.listExclusions(parent).iterateAll()) {
@@ -1930,6 +2056,8 @@ public final ListExclusionsPagedResponse listExclusions(BillingAccountName paren
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   FolderName parent = FolderName.of("[FOLDER]");
    *   for (LogExclusion element : configClient.listExclusions(parent).iterateAll()) {
@@ -1958,6 +2086,8 @@ public final ListExclusionsPagedResponse listExclusions(FolderName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   OrganizationName parent = OrganizationName.of("[ORGANIZATION]");
    *   for (LogExclusion element : configClient.listExclusions(parent).iterateAll()) {
@@ -1986,6 +2116,8 @@ public final ListExclusionsPagedResponse listExclusions(OrganizationName parent)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (LogExclusion element : configClient.listExclusions(parent).iterateAll()) {
@@ -2014,6 +2146,8 @@ public final ListExclusionsPagedResponse listExclusions(ProjectName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (LogExclusion element : configClient.listExclusions(parent).iterateAll()) {
@@ -2039,6 +2173,8 @@ public final ListExclusionsPagedResponse listExclusions(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListExclusionsRequest request =
    *       ListExclusionsRequest.newBuilder()
@@ -2066,6 +2202,8 @@ public final ListExclusionsPagedResponse listExclusions(ListExclusionsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListExclusionsRequest request =
    *       ListExclusionsRequest.newBuilder()
@@ -2094,6 +2232,8 @@ public final ListExclusionsPagedResponse listExclusions(ListExclusionsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ListExclusionsRequest request =
    *       ListExclusionsRequest.newBuilder()
@@ -2128,6 +2268,8 @@ public final ListExclusionsPagedResponse listExclusions(ListExclusionsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
    *   LogExclusion response = configClient.getExclusion(name);
@@ -2155,6 +2297,8 @@ public final LogExclusion getExclusion(LogExclusionName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]").toString();
    *   LogExclusion response = configClient.getExclusion(name);
@@ -2181,6 +2325,8 @@ public final LogExclusion getExclusion(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetExclusionRequest request =
    *       GetExclusionRequest.newBuilder()
@@ -2205,6 +2351,8 @@ public final LogExclusion getExclusion(GetExclusionRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetExclusionRequest request =
    *       GetExclusionRequest.newBuilder()
@@ -2229,6 +2377,8 @@ public final UnaryCallable getExclusionCallab
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
    *   LogExclusion exclusion = LogExclusion.newBuilder().build();
@@ -2261,6 +2411,8 @@ public final LogExclusion createExclusion(BillingAccountName parent, LogExclusio
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   FolderName parent = FolderName.of("[FOLDER]");
    *   LogExclusion exclusion = LogExclusion.newBuilder().build();
@@ -2293,6 +2445,8 @@ public final LogExclusion createExclusion(FolderName parent, LogExclusion exclus
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   OrganizationName parent = OrganizationName.of("[ORGANIZATION]");
    *   LogExclusion exclusion = LogExclusion.newBuilder().build();
@@ -2325,6 +2479,8 @@ public final LogExclusion createExclusion(OrganizationName parent, LogExclusion
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   LogExclusion exclusion = LogExclusion.newBuilder().build();
@@ -2357,6 +2513,8 @@ public final LogExclusion createExclusion(ProjectName parent, LogExclusion exclu
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   LogExclusion exclusion = LogExclusion.newBuilder().build();
@@ -2386,6 +2544,8 @@ public final LogExclusion createExclusion(String parent, LogExclusion exclusion)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateExclusionRequest request =
    *       CreateExclusionRequest.newBuilder()
@@ -2411,6 +2571,8 @@ public final LogExclusion createExclusion(CreateExclusionRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   CreateExclusionRequest request =
    *       CreateExclusionRequest.newBuilder()
@@ -2434,6 +2596,8 @@ public final UnaryCallable createExclusion
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
    *   LogExclusion exclusion = LogExclusion.newBuilder().build();
@@ -2476,6 +2640,8 @@ public final LogExclusion updateExclusion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]").toString();
    *   LogExclusion exclusion = LogExclusion.newBuilder().build();
@@ -2518,6 +2684,8 @@ public final LogExclusion updateExclusion(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateExclusionRequest request =
    *       UpdateExclusionRequest.newBuilder()
@@ -2544,6 +2712,8 @@ public final LogExclusion updateExclusion(UpdateExclusionRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateExclusionRequest request =
    *       UpdateExclusionRequest.newBuilder()
@@ -2569,6 +2739,8 @@ public final UnaryCallable updateExclusion
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
    *   configClient.deleteExclusion(name);
@@ -2596,6 +2768,8 @@ public final void deleteExclusion(LogExclusionName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   String name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]").toString();
    *   configClient.deleteExclusion(name);
@@ -2622,6 +2796,8 @@ public final void deleteExclusion(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteExclusionRequest request =
    *       DeleteExclusionRequest.newBuilder()
@@ -2646,6 +2822,8 @@ public final void deleteExclusion(DeleteExclusionRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   DeleteExclusionRequest request =
    *       DeleteExclusionRequest.newBuilder()
@@ -2675,6 +2853,8 @@ public final UnaryCallable deleteExclusionCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetCmekSettingsRequest request =
    *       GetCmekSettingsRequest.newBuilder()
@@ -2704,6 +2884,8 @@ public final CmekSettings getCmekSettings(GetCmekSettingsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   GetCmekSettingsRequest request =
    *       GetCmekSettingsRequest.newBuilder()
@@ -2737,6 +2919,8 @@ public final UnaryCallable getCmekSettings
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateCmekSettingsRequest request =
    *       UpdateCmekSettingsRequest.newBuilder()
@@ -2773,6 +2957,8 @@ public final CmekSettings updateCmekSettings(UpdateCmekSettingsRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (ConfigClient configClient = ConfigClient.create()) {
    *   UpdateCmekSettingsRequest request =
    *       UpdateCmekSettingsRequest.newBuilder()
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigSettings.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigSettings.java
index 4f7620cd37..3ad7561d48 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigSettings.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/ConfigSettings.java
@@ -89,6 +89,8 @@
  * 
For example, to set the total timeout of getBucket to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * ConfigSettings.Builder configSettingsBuilder = ConfigSettings.newBuilder();
  * configSettingsBuilder
  *     .getBucketSettings()
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingClient.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingClient.java
index cc55e72ca2..e15a4f0960 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingClient.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingClient.java
@@ -63,6 +63,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (LoggingClient loggingClient = LoggingClient.create()) {
  *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
  *   loggingClient.deleteLog(logName);
@@ -98,6 +100,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LoggingSettings loggingSettings =
  *     LoggingSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -108,6 +112,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LoggingSettings loggingSettings = LoggingSettings.newBuilder().setEndpoint(myEndpoint).build();
  * LoggingClient loggingClient = LoggingClient.create(loggingSettings);
  * }

@@ -174,6 +180,8 @@ public LoggingServiceV2Stub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
    *   loggingClient.deleteLog(logName);
@@ -205,6 +213,8 @@ public final void deleteLog(LogName logName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   String logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]").toString();
    *   loggingClient.deleteLog(logName);
@@ -233,6 +243,8 @@ public final void deleteLog(String logName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   DeleteLogRequest request =
    *       DeleteLogRequest.newBuilder()
@@ -258,6 +270,8 @@ public final void deleteLog(DeleteLogRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   DeleteLogRequest request =
    *       DeleteLogRequest.newBuilder()
@@ -283,6 +297,8 @@ public final UnaryCallable deleteLogCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
    *   MonitoredResource resource = MonitoredResource.newBuilder().build();
@@ -358,6 +374,8 @@ public final WriteLogEntriesResponse writeLogEntries(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   String logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]").toString();
    *   MonitoredResource resource = MonitoredResource.newBuilder().build();
@@ -433,6 +451,8 @@ public final WriteLogEntriesResponse writeLogEntries(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   WriteLogEntriesRequest request =
    *       WriteLogEntriesRequest.newBuilder()
@@ -464,6 +484,8 @@ public final WriteLogEntriesResponse writeLogEntries(WriteLogEntriesRequest requ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   WriteLogEntriesRequest request =
    *       WriteLogEntriesRequest.newBuilder()
@@ -495,6 +517,8 @@ public final WriteLogEntriesResponse writeLogEntries(WriteLogEntriesRequest requ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   List resourceNames = new ArrayList<>();
    *   String filter = "filter-1274492040";
@@ -549,6 +573,8 @@ public final ListLogEntriesPagedResponse listLogEntries(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListLogEntriesRequest request =
    *       ListLogEntriesRequest.newBuilder()
@@ -580,6 +606,8 @@ public final ListLogEntriesPagedResponse listLogEntries(ListLogEntriesRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListLogEntriesRequest request =
    *       ListLogEntriesRequest.newBuilder()
@@ -611,6 +639,8 @@ public final ListLogEntriesPagedResponse listLogEntries(ListLogEntriesRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListLogEntriesRequest request =
    *       ListLogEntriesRequest.newBuilder()
@@ -647,6 +677,8 @@ public final ListLogEntriesPagedResponse listLogEntries(ListLogEntriesRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListMonitoredResourceDescriptorsRequest request =
    *       ListMonitoredResourceDescriptorsRequest.newBuilder()
@@ -675,6 +707,8 @@ public final ListMonitoredResourceDescriptorsPagedResponse listMonitoredResource
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListMonitoredResourceDescriptorsRequest request =
    *       ListMonitoredResourceDescriptorsRequest.newBuilder()
@@ -703,6 +737,8 @@ public final ListMonitoredResourceDescriptorsPagedResponse listMonitoredResource
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListMonitoredResourceDescriptorsRequest request =
    *       ListMonitoredResourceDescriptorsRequest.newBuilder()
@@ -739,6 +775,8 @@ public final ListMonitoredResourceDescriptorsPagedResponse listMonitoredResource
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
    *   for (String element : loggingClient.listLogs(parent).iterateAll()) {
@@ -766,6 +804,8 @@ public final ListLogsPagedResponse listLogs(BillingAccountName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   FolderName parent = FolderName.of("[FOLDER]");
    *   for (String element : loggingClient.listLogs(parent).iterateAll()) {
@@ -793,6 +833,8 @@ public final ListLogsPagedResponse listLogs(FolderName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   OrganizationName parent = OrganizationName.of("[ORGANIZATION]");
    *   for (String element : loggingClient.listLogs(parent).iterateAll()) {
@@ -820,6 +862,8 @@ public final ListLogsPagedResponse listLogs(OrganizationName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (String element : loggingClient.listLogs(parent).iterateAll()) {
@@ -847,6 +891,8 @@ public final ListLogsPagedResponse listLogs(ProjectName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (String element : loggingClient.listLogs(parent).iterateAll()) {
@@ -873,6 +919,8 @@ public final ListLogsPagedResponse listLogs(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListLogsRequest request =
    *       ListLogsRequest.newBuilder()
@@ -902,6 +950,8 @@ public final ListLogsPagedResponse listLogs(ListLogsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListLogsRequest request =
    *       ListLogsRequest.newBuilder()
@@ -930,6 +980,8 @@ public final UnaryCallable listLogsPaged
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   ListLogsRequest request =
    *       ListLogsRequest.newBuilder()
@@ -965,6 +1017,8 @@ public final UnaryCallable listLogsCallable()
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (LoggingClient loggingClient = LoggingClient.create()) {
    *   BidiStream bidiStream =
    *       loggingClient.tailLogEntriesCallable().call();
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingSettings.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingSettings.java
index 8643ce5d28..a128b6498e 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingSettings.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/LoggingSettings.java
@@ -69,6 +69,8 @@
  * 
For example, to set the total timeout of deleteLog to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LoggingSettings.Builder loggingSettingsBuilder = LoggingSettings.newBuilder();
  * loggingSettingsBuilder
  *     .deleteLogSettings()
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsClient.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsClient.java
index bd686dac22..c74e0a912c 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsClient.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsClient.java
@@ -51,6 +51,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (MetricsClient metricsClient = MetricsClient.create()) {
  *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
  *   LogMetric response = metricsClient.getLogMetric(metricName);
@@ -86,6 +88,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * MetricsSettings metricsSettings =
  *     MetricsSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -96,6 +100,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * MetricsSettings metricsSettings = MetricsSettings.newBuilder().setEndpoint(myEndpoint).build();
  * MetricsClient metricsClient = MetricsClient.create(metricsSettings);
  * }

@@ -160,6 +166,8 @@ public MetricsServiceV2Stub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (LogMetric element : metricsClient.listLogMetrics(parent).iterateAll()) {
@@ -187,6 +195,8 @@ public final ListLogMetricsPagedResponse listLogMetrics(ProjectName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (LogMetric element : metricsClient.listLogMetrics(parent).iterateAll()) {
@@ -211,6 +221,8 @@ public final ListLogMetricsPagedResponse listLogMetrics(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   ListLogMetricsRequest request =
    *       ListLogMetricsRequest.newBuilder()
@@ -238,6 +250,8 @@ public final ListLogMetricsPagedResponse listLogMetrics(ListLogMetricsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   ListLogMetricsRequest request =
    *       ListLogMetricsRequest.newBuilder()
@@ -265,6 +279,8 @@ public final ListLogMetricsPagedResponse listLogMetrics(ListLogMetricsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   ListLogMetricsRequest request =
    *       ListLogMetricsRequest.newBuilder()
@@ -299,6 +315,8 @@ public final ListLogMetricsPagedResponse listLogMetrics(ListLogMetricsRequest re
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
    *   LogMetric response = metricsClient.getLogMetric(metricName);
@@ -324,6 +342,8 @@ public final LogMetric getLogMetric(LogMetricName metricName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   String metricName = LogMetricName.of("[PROJECT]", "[METRIC]").toString();
    *   LogMetric response = metricsClient.getLogMetric(metricName);
@@ -347,6 +367,8 @@ public final LogMetric getLogMetric(String metricName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   GetLogMetricRequest request =
    *       GetLogMetricRequest.newBuilder()
@@ -370,6 +392,8 @@ public final LogMetric getLogMetric(GetLogMetricRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   GetLogMetricRequest request =
    *       GetLogMetricRequest.newBuilder()
@@ -392,6 +416,8 @@ public final UnaryCallable getLogMetricCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   LogMetric metric = LogMetric.newBuilder().build();
@@ -422,6 +448,8 @@ public final LogMetric createLogMetric(ProjectName parent, LogMetric metric) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   LogMetric metric = LogMetric.newBuilder().build();
@@ -449,6 +477,8 @@ public final LogMetric createLogMetric(String parent, LogMetric metric) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   CreateLogMetricRequest request =
    *       CreateLogMetricRequest.newBuilder()
@@ -473,6 +503,8 @@ public final LogMetric createLogMetric(CreateLogMetricRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   CreateLogMetricRequest request =
    *       CreateLogMetricRequest.newBuilder()
@@ -496,6 +528,8 @@ public final UnaryCallable createLogMetricCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
    *   LogMetric metric = LogMetric.newBuilder().build();
@@ -527,6 +561,8 @@ public final LogMetric updateLogMetric(LogMetricName metricName, LogMetric metri
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   String metricName = LogMetricName.of("[PROJECT]", "[METRIC]").toString();
    *   LogMetric metric = LogMetric.newBuilder().build();
@@ -555,6 +591,8 @@ public final LogMetric updateLogMetric(String metricName, LogMetric metric) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   UpdateLogMetricRequest request =
    *       UpdateLogMetricRequest.newBuilder()
@@ -579,6 +617,8 @@ public final LogMetric updateLogMetric(UpdateLogMetricRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   UpdateLogMetricRequest request =
    *       UpdateLogMetricRequest.newBuilder()
@@ -602,6 +642,8 @@ public final UnaryCallable updateLogMetricCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
    *   metricsClient.deleteLogMetric(metricName);
@@ -627,6 +669,8 @@ public final void deleteLogMetric(LogMetricName metricName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   String metricName = LogMetricName.of("[PROJECT]", "[METRIC]").toString();
    *   metricsClient.deleteLogMetric(metricName);
@@ -650,6 +694,8 @@ public final void deleteLogMetric(String metricName) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   DeleteLogMetricRequest request =
    *       DeleteLogMetricRequest.newBuilder()
@@ -673,6 +719,8 @@ public final void deleteLogMetric(DeleteLogMetricRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (MetricsClient metricsClient = MetricsClient.create()) {
    *   DeleteLogMetricRequest request =
    *       DeleteLogMetricRequest.newBuilder()
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsSettings.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsSettings.java
index 1cd15a6aa0..d795fcdd39 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsSettings.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/MetricsSettings.java
@@ -61,6 +61,8 @@
  * 
For example, to set the total timeout of getLogMetric to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * MetricsSettings.Builder metricsSettingsBuilder = MetricsSettings.newBuilder();
  * metricsSettingsBuilder
  *     .getLogMetricSettings()
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/package-info.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/package-info.java
index 6de1226da7..291dcca51b 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/package-info.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/package-info.java
@@ -24,6 +24,8 @@
  * 
Sample for LoggingClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (LoggingClient loggingClient = LoggingClient.create()) {
  *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
  *   loggingClient.deleteLog(logName);
@@ -37,6 +39,8 @@
  * 
Sample for ConfigClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (ConfigClient configClient = ConfigClient.create()) {
  *   GetBucketRequest request =
  *       GetBucketRequest.newBuilder()
@@ -55,6 +59,8 @@
  * 
Sample for MetricsClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (MetricsClient metricsClient = MetricsClient.create()) {
  *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
  *   LogMetric response = metricsClient.getLogMetric(metricName);
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/ConfigServiceV2StubSettings.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/ConfigServiceV2StubSettings.java
index 26115a15fd..456dd597f4 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/ConfigServiceV2StubSettings.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/ConfigServiceV2StubSettings.java
@@ -103,6 +103,8 @@
  * 
For example, to set the total timeout of getBucket to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * ConfigServiceV2StubSettings.Builder configSettingsBuilder =
  *     ConfigServiceV2StubSettings.newBuilder();
  * configSettingsBuilder
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/LoggingServiceV2StubSettings.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/LoggingServiceV2StubSettings.java
index 79ba51699e..180ef48c6b 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/LoggingServiceV2StubSettings.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/LoggingServiceV2StubSettings.java
@@ -93,6 +93,8 @@
  * 
For example, to set the total timeout of deleteLog to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * LoggingServiceV2StubSettings.Builder loggingSettingsBuilder =
  *     LoggingServiceV2StubSettings.newBuilder();
  * loggingSettingsBuilder
diff --git a/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/MetricsServiceV2StubSettings.java b/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/MetricsServiceV2StubSettings.java
index 7c0505427f..5716cdceae 100644
--- a/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/MetricsServiceV2StubSettings.java
+++ b/test/integration/goldens/logging/com/google/cloud/logging/v2/stub/MetricsServiceV2StubSettings.java
@@ -75,6 +75,8 @@
  * 
For example, to set the total timeout of getLogMetric to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * MetricsServiceV2StubSettings.Builder metricsSettingsBuilder =
  *     MetricsServiceV2StubSettings.newBuilder();
  * metricsSettingsBuilder
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceClient.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceClient.java
index 27f64bbed8..0efce32a29 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceClient.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceClient.java
@@ -59,6 +59,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
  *   ProjectName parent = ProjectName.of("[PROJECT]");
  *   Schema schema = Schema.newBuilder().build();
@@ -96,6 +98,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SchemaServiceSettings schemaServiceSettings =
  *     SchemaServiceSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -106,6 +110,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SchemaServiceSettings schemaServiceSettings =
  *     SchemaServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
  * SchemaServiceClient schemaServiceClient = SchemaServiceClient.create(schemaServiceSettings);
@@ -173,6 +179,8 @@ public SchemaServiceStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   Schema schema = Schema.newBuilder().build();
@@ -209,6 +217,8 @@ public final Schema createSchema(ProjectName parent, Schema schema, String schem
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   Schema schema = Schema.newBuilder().build();
@@ -245,6 +255,8 @@ public final Schema createSchema(String parent, Schema schema, String schemaId)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   CreateSchemaRequest request =
    *       CreateSchemaRequest.newBuilder()
@@ -270,6 +282,8 @@ public final Schema createSchema(CreateSchemaRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   CreateSchemaRequest request =
    *       CreateSchemaRequest.newBuilder()
@@ -294,6 +308,8 @@ public final UnaryCallable createSchemaCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   SchemaName name = SchemaName.of("[PROJECT]", "[SCHEMA]");
    *   Schema response = schemaServiceClient.getSchema(name);
@@ -317,6 +333,8 @@ public final Schema getSchema(SchemaName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   String name = SchemaName.of("[PROJECT]", "[SCHEMA]").toString();
    *   Schema response = schemaServiceClient.getSchema(name);
@@ -339,6 +357,8 @@ public final Schema getSchema(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   GetSchemaRequest request =
    *       GetSchemaRequest.newBuilder()
@@ -363,6 +383,8 @@ public final Schema getSchema(GetSchemaRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   GetSchemaRequest request =
    *       GetSchemaRequest.newBuilder()
@@ -386,6 +408,8 @@ public final UnaryCallable getSchemaCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (Schema element : schemaServiceClient.listSchemas(parent).iterateAll()) {
@@ -413,6 +437,8 @@ public final ListSchemasPagedResponse listSchemas(ProjectName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (Schema element : schemaServiceClient.listSchemas(parent).iterateAll()) {
@@ -437,6 +463,8 @@ public final ListSchemasPagedResponse listSchemas(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ListSchemasRequest request =
    *       ListSchemasRequest.newBuilder()
@@ -465,6 +493,8 @@ public final ListSchemasPagedResponse listSchemas(ListSchemasRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ListSchemasRequest request =
    *       ListSchemasRequest.newBuilder()
@@ -493,6 +523,8 @@ public final ListSchemasPagedResponse listSchemas(ListSchemasRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ListSchemasRequest request =
    *       ListSchemasRequest.newBuilder()
@@ -527,6 +559,8 @@ public final UnaryCallable listSchemasC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   SchemaName name = SchemaName.of("[PROJECT]", "[SCHEMA]");
    *   schemaServiceClient.deleteSchema(name);
@@ -550,6 +584,8 @@ public final void deleteSchema(SchemaName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   String name = SchemaName.of("[PROJECT]", "[SCHEMA]").toString();
    *   schemaServiceClient.deleteSchema(name);
@@ -572,6 +608,8 @@ public final void deleteSchema(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   DeleteSchemaRequest request =
    *       DeleteSchemaRequest.newBuilder()
@@ -595,6 +633,8 @@ public final void deleteSchema(DeleteSchemaRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   DeleteSchemaRequest request =
    *       DeleteSchemaRequest.newBuilder()
@@ -617,6 +657,8 @@ public final UnaryCallable deleteSchemaCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   Schema schema = Schema.newBuilder().build();
@@ -645,6 +687,8 @@ public final ValidateSchemaResponse validateSchema(ProjectName parent, Schema sc
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   Schema schema = Schema.newBuilder().build();
@@ -670,6 +714,8 @@ public final ValidateSchemaResponse validateSchema(String parent, Schema schema)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ValidateSchemaRequest request =
    *       ValidateSchemaRequest.newBuilder()
@@ -694,6 +740,8 @@ public final ValidateSchemaResponse validateSchema(ValidateSchemaRequest request
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ValidateSchemaRequest request =
    *       ValidateSchemaRequest.newBuilder()
@@ -719,6 +767,8 @@ public final ValidateSchemaResponse validateSchema(ValidateSchemaRequest request
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ValidateMessageRequest request =
    *       ValidateMessageRequest.newBuilder()
@@ -744,6 +794,8 @@ public final ValidateMessageResponse validateMessage(ValidateMessageRequest requ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   ValidateMessageRequest request =
    *       ValidateMessageRequest.newBuilder()
@@ -772,6 +824,8 @@ public final ValidateMessageResponse validateMessage(ValidateMessageRequest requ
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -798,6 +852,8 @@ public final Policy setIamPolicy(SetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -822,6 +878,8 @@ public final UnaryCallable setIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -847,6 +905,8 @@ public final Policy getIamPolicy(GetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -875,6 +935,8 @@ public final UnaryCallable getIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
@@ -904,6 +966,8 @@ public final TestIamPermissionsResponse testIamPermissions(TestIamPermissionsReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceSettings.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceSettings.java
index 7fa08f222a..7633464d05 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceSettings.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SchemaServiceSettings.java
@@ -69,6 +69,8 @@
  * 
For example, to set the total timeout of createSchema to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SchemaServiceSettings.Builder schemaServiceSettingsBuilder = SchemaServiceSettings.newBuilder();
  * schemaServiceSettingsBuilder
  *     .createSchemaSettings()
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminClient.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminClient.java
index 17f81341f6..9b31bed522 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminClient.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminClient.java
@@ -77,6 +77,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
  *   SubscriptionName name = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
  *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
@@ -117,6 +119,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SubscriptionAdminSettings subscriptionAdminSettings =
  *     SubscriptionAdminSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -128,6 +132,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SubscriptionAdminSettings subscriptionAdminSettings =
  *     SubscriptionAdminSettings.newBuilder().setEndpoint(myEndpoint).build();
  * SubscriptionAdminClient subscriptionAdminClient =
@@ -205,6 +211,8 @@ public SubscriberStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName name = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
@@ -271,6 +279,8 @@ public final Subscription createSubscription(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName name = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   String topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
@@ -337,6 +347,8 @@ public final Subscription createSubscription(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String name = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
@@ -403,6 +415,8 @@ public final Subscription createSubscription(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String name = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   String topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
@@ -469,6 +483,8 @@ public final Subscription createSubscription(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   Subscription request =
    *       Subscription.newBuilder()
@@ -515,6 +531,8 @@ public final Subscription createSubscription(Subscription request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   Subscription request =
    *       Subscription.newBuilder()
@@ -552,6 +570,8 @@ public final UnaryCallable createSubscriptionCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   Subscription response = subscriptionAdminClient.getSubscription(subscription);
@@ -577,6 +597,8 @@ public final Subscription getSubscription(SubscriptionName subscription) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   Subscription response = subscriptionAdminClient.getSubscription(subscription);
@@ -600,6 +622,8 @@ public final Subscription getSubscription(String subscription) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   GetSubscriptionRequest request =
    *       GetSubscriptionRequest.newBuilder()
@@ -623,6 +647,8 @@ public final Subscription getSubscription(GetSubscriptionRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   GetSubscriptionRequest request =
    *       GetSubscriptionRequest.newBuilder()
@@ -647,6 +673,8 @@ public final UnaryCallable getSubscription
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   UpdateSubscriptionRequest request =
    *       UpdateSubscriptionRequest.newBuilder()
@@ -672,6 +700,8 @@ public final Subscription updateSubscription(UpdateSubscriptionRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   UpdateSubscriptionRequest request =
    *       UpdateSubscriptionRequest.newBuilder()
@@ -696,6 +726,8 @@ public final UnaryCallable updateSubscr
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ProjectName project = ProjectName.of("[PROJECT]");
    *   for (Subscription element : subscriptionAdminClient.listSubscriptions(project).iterateAll()) {
@@ -723,6 +755,8 @@ public final ListSubscriptionsPagedResponse listSubscriptions(ProjectName projec
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String project = ProjectName.of("[PROJECT]").toString();
    *   for (Subscription element : subscriptionAdminClient.listSubscriptions(project).iterateAll()) {
@@ -748,6 +782,8 @@ public final ListSubscriptionsPagedResponse listSubscriptions(String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ListSubscriptionsRequest request =
    *       ListSubscriptionsRequest.newBuilder()
@@ -775,6 +811,8 @@ public final ListSubscriptionsPagedResponse listSubscriptions(ListSubscriptionsR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ListSubscriptionsRequest request =
    *       ListSubscriptionsRequest.newBuilder()
@@ -803,6 +841,8 @@ public final ListSubscriptionsPagedResponse listSubscriptions(ListSubscriptionsR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ListSubscriptionsRequest request =
    *       ListSubscriptionsRequest.newBuilder()
@@ -841,6 +881,8 @@ public final ListSubscriptionsPagedResponse listSubscriptions(ListSubscriptionsR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   subscriptionAdminClient.deleteSubscription(subscription);
@@ -869,6 +911,8 @@ public final void deleteSubscription(SubscriptionName subscription) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   subscriptionAdminClient.deleteSubscription(subscription);
@@ -895,6 +939,8 @@ public final void deleteSubscription(String subscription) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   DeleteSubscriptionRequest request =
    *       DeleteSubscriptionRequest.newBuilder()
@@ -921,6 +967,8 @@ public final void deleteSubscription(DeleteSubscriptionRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   DeleteSubscriptionRequest request =
    *       DeleteSubscriptionRequest.newBuilder()
@@ -947,6 +995,8 @@ public final UnaryCallable deleteSubscriptionC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   List ackIds = new ArrayList<>();
@@ -988,6 +1038,8 @@ public final void modifyAckDeadline(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   List ackIds = new ArrayList<>();
@@ -1029,6 +1081,8 @@ public final void modifyAckDeadline(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ModifyAckDeadlineRequest request =
    *       ModifyAckDeadlineRequest.newBuilder()
@@ -1057,6 +1111,8 @@ public final void modifyAckDeadline(ModifyAckDeadlineRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ModifyAckDeadlineRequest request =
    *       ModifyAckDeadlineRequest.newBuilder()
@@ -1086,6 +1142,8 @@ public final UnaryCallable modifyAckDeadlineCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   List ackIds = new ArrayList<>();
@@ -1119,6 +1177,8 @@ public final void acknowledge(SubscriptionName subscription, List ackIds
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   List ackIds = new ArrayList<>();
@@ -1149,6 +1209,8 @@ public final void acknowledge(String subscription, List ackIds) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   AcknowledgeRequest request =
    *       AcknowledgeRequest.newBuilder()
@@ -1177,6 +1239,8 @@ public final void acknowledge(AcknowledgeRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   AcknowledgeRequest request =
    *       AcknowledgeRequest.newBuilder()
@@ -1201,6 +1265,8 @@ public final UnaryCallable acknowledgeCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   int maxMessages = 496131527;
@@ -1231,6 +1297,8 @@ public final PullResponse pull(SubscriptionName subscription, int maxMessages) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   int maxMessages = 496131527;
@@ -1258,6 +1326,8 @@ public final PullResponse pull(String subscription, int maxMessages) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   boolean returnImmediately = true;
@@ -1298,6 +1368,8 @@ public final PullResponse pull(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   boolean returnImmediately = true;
@@ -1337,6 +1409,8 @@ public final PullResponse pull(String subscription, boolean returnImmediately, i
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   PullRequest request =
    *       PullRequest.newBuilder()
@@ -1363,6 +1437,8 @@ public final PullResponse pull(PullRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   PullRequest request =
    *       PullRequest.newBuilder()
@@ -1392,6 +1468,8 @@ public final UnaryCallable pullCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   BidiStream bidiStream =
    *       subscriptionAdminClient.streamingPullCallable().call();
@@ -1430,6 +1508,8 @@ public final UnaryCallable pullCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
    *   PushConfig pushConfig = PushConfig.newBuilder().build();
@@ -1466,6 +1546,8 @@ public final void modifyPushConfig(SubscriptionName subscription, PushConfig pus
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
    *   PushConfig pushConfig = PushConfig.newBuilder().build();
@@ -1502,6 +1584,8 @@ public final void modifyPushConfig(String subscription, PushConfig pushConfig) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ModifyPushConfigRequest request =
    *       ModifyPushConfigRequest.newBuilder()
@@ -1531,6 +1615,8 @@ public final void modifyPushConfig(ModifyPushConfigRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ModifyPushConfigRequest request =
    *       ModifyPushConfigRequest.newBuilder()
@@ -1558,6 +1644,8 @@ public final UnaryCallable modifyPushConfigCalla
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SnapshotName snapshot = SnapshotName.of("[PROJECT]", "[SNAPSHOT]");
    *   Snapshot response = subscriptionAdminClient.getSnapshot(snapshot);
@@ -1586,6 +1674,8 @@ public final Snapshot getSnapshot(SnapshotName snapshot) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String snapshot = SnapshotName.of("[PROJECT]", "[SNAPSHOT]").toString();
    *   Snapshot response = subscriptionAdminClient.getSnapshot(snapshot);
@@ -1611,6 +1701,8 @@ public final Snapshot getSnapshot(String snapshot) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   GetSnapshotRequest request =
    *       GetSnapshotRequest.newBuilder()
@@ -1637,6 +1729,8 @@ public final Snapshot getSnapshot(GetSnapshotRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   GetSnapshotRequest request =
    *       GetSnapshotRequest.newBuilder()
@@ -1663,6 +1757,8 @@ public final UnaryCallable getSnapshotCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ProjectName project = ProjectName.of("[PROJECT]");
    *   for (Snapshot element : subscriptionAdminClient.listSnapshots(project).iterateAll()) {
@@ -1693,6 +1789,8 @@ public final ListSnapshotsPagedResponse listSnapshots(ProjectName project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String project = ProjectName.of("[PROJECT]").toString();
    *   for (Snapshot element : subscriptionAdminClient.listSnapshots(project).iterateAll()) {
@@ -1720,6 +1818,8 @@ public final ListSnapshotsPagedResponse listSnapshots(String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ListSnapshotsRequest request =
    *       ListSnapshotsRequest.newBuilder()
@@ -1750,6 +1850,8 @@ public final ListSnapshotsPagedResponse listSnapshots(ListSnapshotsRequest reque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ListSnapshotsRequest request =
    *       ListSnapshotsRequest.newBuilder()
@@ -1781,6 +1883,8 @@ public final ListSnapshotsPagedResponse listSnapshots(ListSnapshotsRequest reque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   ListSnapshotsRequest request =
    *       ListSnapshotsRequest.newBuilder()
@@ -1826,6 +1930,8 @@ public final UnaryCallable listSnap
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SnapshotName name = SnapshotName.of("[PROJECT]", "[SNAPSHOT]");
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
@@ -1874,6 +1980,8 @@ public final Snapshot createSnapshot(SnapshotName name, SubscriptionName subscri
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SnapshotName name = SnapshotName.of("[PROJECT]", "[SNAPSHOT]");
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
@@ -1922,6 +2030,8 @@ public final Snapshot createSnapshot(SnapshotName name, String subscription) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String name = SnapshotName.of("[PROJECT]", "[SNAPSHOT]").toString();
    *   SubscriptionName subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
@@ -1970,6 +2080,8 @@ public final Snapshot createSnapshot(String name, SubscriptionName subscription)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String name = SnapshotName.of("[PROJECT]", "[SNAPSHOT]").toString();
    *   String subscription = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]").toString();
@@ -2015,6 +2127,8 @@ public final Snapshot createSnapshot(String name, String subscription) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   CreateSnapshotRequest request =
    *       CreateSnapshotRequest.newBuilder()
@@ -2051,6 +2165,8 @@ public final Snapshot createSnapshot(CreateSnapshotRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   CreateSnapshotRequest request =
    *       CreateSnapshotRequest.newBuilder()
@@ -2079,6 +2195,8 @@ public final UnaryCallable createSnapshotCallab
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   UpdateSnapshotRequest request =
    *       UpdateSnapshotRequest.newBuilder()
@@ -2106,6 +2224,8 @@ public final Snapshot updateSnapshot(UpdateSnapshotRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   UpdateSnapshotRequest request =
    *       UpdateSnapshotRequest.newBuilder()
@@ -2136,6 +2256,8 @@ public final UnaryCallable updateSnapshotCallab
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SnapshotName snapshot = SnapshotName.of("[PROJECT]", "[SNAPSHOT]");
    *   subscriptionAdminClient.deleteSnapshot(snapshot);
@@ -2167,6 +2289,8 @@ public final void deleteSnapshot(SnapshotName snapshot) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   String snapshot = SnapshotName.of("[PROJECT]", "[SNAPSHOT]").toString();
    *   subscriptionAdminClient.deleteSnapshot(snapshot);
@@ -2196,6 +2320,8 @@ public final void deleteSnapshot(String snapshot) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   DeleteSnapshotRequest request =
    *       DeleteSnapshotRequest.newBuilder()
@@ -2225,6 +2351,8 @@ public final void deleteSnapshot(DeleteSnapshotRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   DeleteSnapshotRequest request =
    *       DeleteSnapshotRequest.newBuilder()
@@ -2253,6 +2381,8 @@ public final UnaryCallable deleteSnapshotCallable(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SeekRequest request =
    *       SeekRequest.newBuilder()
@@ -2281,6 +2411,8 @@ public final SeekResponse seek(SeekRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SeekRequest request =
    *       SeekRequest.newBuilder()
@@ -2305,6 +2437,8 @@ public final UnaryCallable seekCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -2331,6 +2465,8 @@ public final Policy setIamPolicy(SetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -2355,6 +2491,8 @@ public final UnaryCallable setIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -2380,6 +2518,8 @@ public final Policy getIamPolicy(GetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -2408,6 +2548,8 @@ public final UnaryCallable getIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
@@ -2437,6 +2579,8 @@ public final TestIamPermissionsResponse testIamPermissions(TestIamPermissionsReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminSettings.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminSettings.java
index 93ae5556a8..963195e891 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminSettings.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/SubscriptionAdminSettings.java
@@ -83,6 +83,8 @@
  * 
For example, to set the total timeout of createSubscription to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SubscriptionAdminSettings.Builder subscriptionAdminSettingsBuilder =
  *     SubscriptionAdminSettings.newBuilder();
  * subscriptionAdminSettingsBuilder
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminClient.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminClient.java
index a9f3308846..68bf054a86 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminClient.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminClient.java
@@ -65,6 +65,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
  *   TopicName name = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
  *   Topic response = topicAdminClient.createTopic(name);
@@ -100,6 +102,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * TopicAdminSettings topicAdminSettings =
  *     TopicAdminSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -110,6 +114,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * TopicAdminSettings topicAdminSettings =
  *     TopicAdminSettings.newBuilder().setEndpoint(myEndpoint).build();
  * TopicAdminClient topicAdminClient = TopicAdminClient.create(topicAdminSettings);
@@ -176,6 +182,8 @@ public PublisherStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TopicName name = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
    *   Topic response = topicAdminClient.createTopic(name);
@@ -202,6 +210,8 @@ public final Topic createTopic(TopicName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   String name = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
    *   Topic response = topicAdminClient.createTopic(name);
@@ -228,6 +238,8 @@ public final Topic createTopic(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   Topic request =
    *       Topic.newBuilder()
@@ -258,6 +270,8 @@ public final Topic createTopic(Topic request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   Topic request =
    *       Topic.newBuilder()
@@ -286,6 +300,8 @@ public final UnaryCallable createTopicCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   UpdateTopicRequest request =
    *       UpdateTopicRequest.newBuilder()
@@ -310,6 +326,8 @@ public final Topic updateTopic(UpdateTopicRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   UpdateTopicRequest request =
    *       UpdateTopicRequest.newBuilder()
@@ -333,6 +351,8 @@ public final UnaryCallable updateTopicCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
    *   List messages = new ArrayList<>();
@@ -361,6 +381,8 @@ public final PublishResponse publish(TopicName topic, List messag
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   String topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
    *   List messages = new ArrayList<>();
@@ -386,6 +408,8 @@ public final PublishResponse publish(String topic, List messages)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   PublishRequest request =
    *       PublishRequest.newBuilder()
@@ -410,6 +434,8 @@ public final PublishResponse publish(PublishRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   PublishRequest request =
    *       PublishRequest.newBuilder()
@@ -433,6 +459,8 @@ public final UnaryCallable publishCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
    *   Topic response = topicAdminClient.getTopic(topic);
@@ -456,6 +484,8 @@ public final Topic getTopic(TopicName topic) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   String topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
    *   Topic response = topicAdminClient.getTopic(topic);
@@ -478,6 +508,8 @@ public final Topic getTopic(String topic) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   GetTopicRequest request =
    *       GetTopicRequest.newBuilder()
@@ -501,6 +533,8 @@ public final Topic getTopic(GetTopicRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   GetTopicRequest request =
    *       GetTopicRequest.newBuilder()
@@ -523,6 +557,8 @@ public final UnaryCallable getTopicCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ProjectName project = ProjectName.of("[PROJECT]");
    *   for (Topic element : topicAdminClient.listTopics(project).iterateAll()) {
@@ -550,6 +586,8 @@ public final ListTopicsPagedResponse listTopics(ProjectName project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   String project = ProjectName.of("[PROJECT]").toString();
    *   for (Topic element : topicAdminClient.listTopics(project).iterateAll()) {
@@ -574,6 +612,8 @@ public final ListTopicsPagedResponse listTopics(String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicsRequest request =
    *       ListTopicsRequest.newBuilder()
@@ -601,6 +641,8 @@ public final ListTopicsPagedResponse listTopics(ListTopicsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicsRequest request =
    *       ListTopicsRequest.newBuilder()
@@ -627,6 +669,8 @@ public final UnaryCallable listTopic
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicsRequest request =
    *       ListTopicsRequest.newBuilder()
@@ -660,6 +704,8 @@ public final UnaryCallable listTopicsCall
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
    *   for (String element : topicAdminClient.listTopicSubscriptions(topic).iterateAll()) {
@@ -687,6 +733,8 @@ public final ListTopicSubscriptionsPagedResponse listTopicSubscriptions(TopicNam
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   String topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
    *   for (String element : topicAdminClient.listTopicSubscriptions(topic).iterateAll()) {
@@ -712,6 +760,8 @@ public final ListTopicSubscriptionsPagedResponse listTopicSubscriptions(String t
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicSubscriptionsRequest request =
    *       ListTopicSubscriptionsRequest.newBuilder()
@@ -740,6 +790,8 @@ public final ListTopicSubscriptionsPagedResponse listTopicSubscriptions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicSubscriptionsRequest request =
    *       ListTopicSubscriptionsRequest.newBuilder()
@@ -768,6 +820,8 @@ public final ListTopicSubscriptionsPagedResponse listTopicSubscriptions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicSubscriptionsRequest request =
    *       ListTopicSubscriptionsRequest.newBuilder()
@@ -806,6 +860,8 @@ public final ListTopicSubscriptionsPagedResponse listTopicSubscriptions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
    *   for (String element : topicAdminClient.listTopicSnapshots(topic).iterateAll()) {
@@ -836,6 +892,8 @@ public final ListTopicSnapshotsPagedResponse listTopicSnapshots(TopicName topic)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   String topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
    *   for (String element : topicAdminClient.listTopicSnapshots(topic).iterateAll()) {
@@ -864,6 +922,8 @@ public final ListTopicSnapshotsPagedResponse listTopicSnapshots(String topic) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicSnapshotsRequest request =
    *       ListTopicSnapshotsRequest.newBuilder()
@@ -895,6 +955,8 @@ public final ListTopicSnapshotsPagedResponse listTopicSnapshots(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicSnapshotsRequest request =
    *       ListTopicSnapshotsRequest.newBuilder()
@@ -926,6 +988,8 @@ public final ListTopicSnapshotsPagedResponse listTopicSnapshots(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   ListTopicSnapshotsRequest request =
    *       ListTopicSnapshotsRequest.newBuilder()
@@ -964,6 +1028,8 @@ public final ListTopicSnapshotsPagedResponse listTopicSnapshots(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
    *   topicAdminClient.deleteTopic(topic);
@@ -990,6 +1056,8 @@ public final void deleteTopic(TopicName topic) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   String topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]").toString();
    *   topicAdminClient.deleteTopic(topic);
@@ -1015,6 +1083,8 @@ public final void deleteTopic(String topic) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   DeleteTopicRequest request =
    *       DeleteTopicRequest.newBuilder()
@@ -1041,6 +1111,8 @@ public final void deleteTopic(DeleteTopicRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   DeleteTopicRequest request =
    *       DeleteTopicRequest.newBuilder()
@@ -1065,6 +1137,8 @@ public final UnaryCallable deleteTopicCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   DetachSubscriptionRequest request =
    *       DetachSubscriptionRequest.newBuilder()
@@ -1090,6 +1164,8 @@ public final DetachSubscriptionResponse detachSubscription(DetachSubscriptionReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   DetachSubscriptionRequest request =
    *       DetachSubscriptionRequest.newBuilder()
@@ -1116,6 +1192,8 @@ public final DetachSubscriptionResponse detachSubscription(DetachSubscriptionReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -1142,6 +1220,8 @@ public final Policy setIamPolicy(SetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -1166,6 +1246,8 @@ public final UnaryCallable setIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -1191,6 +1273,8 @@ public final Policy getIamPolicy(GetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -1219,6 +1303,8 @@ public final UnaryCallable getIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
@@ -1248,6 +1334,8 @@ public final TestIamPermissionsResponse testIamPermissions(TestIamPermissionsReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminSettings.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminSettings.java
index 44983d1b49..c3093a8641 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminSettings.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/TopicAdminSettings.java
@@ -76,6 +76,8 @@
  * 
For example, to set the total timeout of createTopic to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * TopicAdminSettings.Builder topicAdminSettingsBuilder = TopicAdminSettings.newBuilder();
  * topicAdminSettingsBuilder
  *     .createTopicSettings()
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/package-info.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/package-info.java
index 5858190904..6e17761f9e 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/package-info.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/package-info.java
@@ -27,6 +27,8 @@
  * 
Sample for TopicAdminClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
  *   TopicName name = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
  *   Topic response = topicAdminClient.createTopic(name);
@@ -42,6 +44,8 @@
  * 
Sample for SubscriptionAdminClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
  *   SubscriptionName name = SubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
  *   TopicName topic = TopicName.ofProjectTopicName("[PROJECT]", "[TOPIC]");
@@ -59,6 +63,8 @@
  * 
Sample for SchemaServiceClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
  *   ProjectName parent = ProjectName.of("[PROJECT]");
  *   Schema schema = Schema.newBuilder().build();
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java
index 945ce51e96..aaeb343d30 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java
@@ -99,6 +99,8 @@
  * 
For example, to set the total timeout of createTopic to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * PublisherStubSettings.Builder topicAdminSettingsBuilder = PublisherStubSettings.newBuilder();
  * topicAdminSettingsBuilder
  *     .createTopicSettings()
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SchemaServiceStubSettings.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SchemaServiceStubSettings.java
index d97ca4fada..a7d8fc4ae4 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SchemaServiceStubSettings.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SchemaServiceStubSettings.java
@@ -82,6 +82,8 @@
  * 
For example, to set the total timeout of createSchema to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SchemaServiceStubSettings.Builder schemaServiceSettingsBuilder =
  *     SchemaServiceStubSettings.newBuilder();
  * schemaServiceSettingsBuilder
diff --git a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SubscriberStubSettings.java b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SubscriberStubSettings.java
index c58c8656d8..bb8299b268 100644
--- a/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SubscriberStubSettings.java
+++ b/test/integration/goldens/pubsub/com/google/cloud/pubsub/v1/stub/SubscriberStubSettings.java
@@ -97,6 +97,8 @@
  * 
For example, to set the total timeout of createSubscription to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * SubscriberStubSettings.Builder subscriptionAdminSettingsBuilder =
  *     SubscriberStubSettings.newBuilder();
  * subscriptionAdminSettingsBuilder
diff --git a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisClient.java b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisClient.java
index 237e88ff06..da68b2788e 100644
--- a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisClient.java
+++ b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisClient.java
@@ -68,6 +68,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
  *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
  *   Instance response = cloudRedisClient.getInstance(name);
@@ -103,6 +105,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * CloudRedisSettings cloudRedisSettings =
  *     CloudRedisSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -113,6 +117,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * CloudRedisSettings cloudRedisSettings =
  *     CloudRedisSettings.newBuilder().setEndpoint(myEndpoint).build();
  * CloudRedisClient cloudRedisClient = CloudRedisClient.create(cloudRedisSettings);
@@ -200,6 +206,8 @@ public final OperationsClient getOperationsClient() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
    *   for (Instance element : cloudRedisClient.listInstances(parent).iterateAll()) {
@@ -237,6 +245,8 @@ public final ListInstancesPagedResponse listInstances(LocationName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String parent = LocationName.of("[PROJECT]", "[LOCATION]").toString();
    *   for (Instance element : cloudRedisClient.listInstances(parent).iterateAll()) {
@@ -271,6 +281,8 @@ public final ListInstancesPagedResponse listInstances(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ListInstancesRequest request =
    *       ListInstancesRequest.newBuilder()
@@ -308,6 +320,8 @@ public final ListInstancesPagedResponse listInstances(ListInstancesRequest reque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ListInstancesRequest request =
    *       ListInstancesRequest.newBuilder()
@@ -346,6 +360,8 @@ public final ListInstancesPagedResponse listInstances(ListInstancesRequest reque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ListInstancesRequest request =
    *       ListInstancesRequest.newBuilder()
@@ -379,6 +395,8 @@ public final UnaryCallable listInst
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
    *   Instance response = cloudRedisClient.getInstance(name);
@@ -403,6 +421,8 @@ public final Instance getInstance(InstanceName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]").toString();
    *   Instance response = cloudRedisClient.getInstance(name);
@@ -426,6 +446,8 @@ public final Instance getInstance(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   GetInstanceRequest request =
    *       GetInstanceRequest.newBuilder()
@@ -449,6 +471,8 @@ public final Instance getInstance(GetInstanceRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   GetInstanceRequest request =
    *       GetInstanceRequest.newBuilder()
@@ -472,6 +496,8 @@ public final UnaryCallable getInstanceCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
    *   InstanceAuthString response = cloudRedisClient.getInstanceAuthString(name);
@@ -499,6 +525,8 @@ public final InstanceAuthString getInstanceAuthString(InstanceName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]").toString();
    *   InstanceAuthString response = cloudRedisClient.getInstanceAuthString(name);
@@ -524,6 +552,8 @@ public final InstanceAuthString getInstanceAuthString(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   GetInstanceAuthStringRequest request =
    *       GetInstanceAuthStringRequest.newBuilder()
@@ -548,6 +578,8 @@ public final InstanceAuthString getInstanceAuthString(GetInstanceAuthStringReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   GetInstanceAuthStringRequest request =
    *       GetInstanceAuthStringRequest.newBuilder()
@@ -583,6 +615,8 @@ public final InstanceAuthString getInstanceAuthString(GetInstanceAuthStringReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
    *   String instanceId = "instanceId902024336";
@@ -635,6 +669,8 @@ public final OperationFuture createInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String parent = LocationName.of("[PROJECT]", "[LOCATION]").toString();
    *   String instanceId = "instanceId902024336";
@@ -687,6 +723,8 @@ public final OperationFuture createInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   CreateInstanceRequest request =
    *       CreateInstanceRequest.newBuilder()
@@ -723,6 +761,8 @@ public final OperationFuture createInstanceAsync(CreateInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   CreateInstanceRequest request =
    *       CreateInstanceRequest.newBuilder()
@@ -760,6 +800,8 @@ public final OperationFuture createInstanceAsync(CreateInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   CreateInstanceRequest request =
    *       CreateInstanceRequest.newBuilder()
@@ -788,6 +830,8 @@ public final UnaryCallable createInstanceCalla
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   FieldMask updateMask = FieldMask.newBuilder().build();
    *   Instance instance = Instance.newBuilder().build();
@@ -821,6 +865,8 @@ public final OperationFuture updateInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   UpdateInstanceRequest request =
    *       UpdateInstanceRequest.newBuilder()
@@ -849,6 +895,8 @@ public final OperationFuture updateInstanceAsync(UpdateInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   UpdateInstanceRequest request =
    *       UpdateInstanceRequest.newBuilder()
@@ -878,6 +926,8 @@ public final OperationFuture updateInstanceAsync(UpdateInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   UpdateInstanceRequest request =
    *       UpdateInstanceRequest.newBuilder()
@@ -901,6 +951,8 @@ public final UnaryCallable updateInstanceCalla
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
    *   String redisVersion = "redisVersion-1972584739";
@@ -931,6 +983,8 @@ public final OperationFuture upgradeInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]").toString();
    *   String redisVersion = "redisVersion-1972584739";
@@ -958,6 +1012,8 @@ public final OperationFuture upgradeInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   UpgradeInstanceRequest request =
    *       UpgradeInstanceRequest.newBuilder()
@@ -982,6 +1038,8 @@ public final OperationFuture upgradeInstanceAsync(UpgradeInstance
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   UpgradeInstanceRequest request =
    *       UpgradeInstanceRequest.newBuilder()
@@ -1007,6 +1065,8 @@ public final OperationFuture upgradeInstanceAsync(UpgradeInstance
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   UpgradeInstanceRequest request =
    *       UpgradeInstanceRequest.newBuilder()
@@ -1036,6 +1096,8 @@ public final UnaryCallable upgradeInstanceCal
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = "name3373707";
    *   InputConfig inputConfig = InputConfig.newBuilder().build();
@@ -1069,6 +1131,8 @@ public final OperationFuture importInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ImportInstanceRequest request =
    *       ImportInstanceRequest.newBuilder()
@@ -1099,6 +1163,8 @@ public final OperationFuture importInstanceAsync(ImportInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ImportInstanceRequest request =
    *       ImportInstanceRequest.newBuilder()
@@ -1130,6 +1196,8 @@ public final OperationFuture importInstanceAsync(ImportInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ImportInstanceRequest request =
    *       ImportInstanceRequest.newBuilder()
@@ -1158,6 +1226,8 @@ public final UnaryCallable importInstanceCalla
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = "name3373707";
    *   OutputConfig outputConfig = OutputConfig.newBuilder().build();
@@ -1190,6 +1260,8 @@ public final OperationFuture exportInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ExportInstanceRequest request =
    *       ExportInstanceRequest.newBuilder()
@@ -1219,6 +1291,8 @@ public final OperationFuture exportInstanceAsync(ExportInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ExportInstanceRequest request =
    *       ExportInstanceRequest.newBuilder()
@@ -1249,6 +1323,8 @@ public final OperationFuture exportInstanceAsync(ExportInstanceRe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   ExportInstanceRequest request =
    *       ExportInstanceRequest.newBuilder()
@@ -1273,6 +1349,8 @@ public final UnaryCallable exportInstanceCalla
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
    *   FailoverInstanceRequest.DataProtectionMode dataProtectionMode =
@@ -1306,6 +1384,8 @@ public final OperationFuture failoverInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]").toString();
    *   FailoverInstanceRequest.DataProtectionMode dataProtectionMode =
@@ -1339,6 +1419,8 @@ public final OperationFuture failoverInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   FailoverInstanceRequest request =
    *       FailoverInstanceRequest.newBuilder()
@@ -1364,6 +1446,8 @@ public final OperationFuture failoverInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   FailoverInstanceRequest request =
    *       FailoverInstanceRequest.newBuilder()
@@ -1389,6 +1473,8 @@ public final OperationFuture failoverInstanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   FailoverInstanceRequest request =
    *       FailoverInstanceRequest.newBuilder()
@@ -1411,6 +1497,8 @@ public final UnaryCallable failoverInstanceC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
    *   cloudRedisClient.deleteInstanceAsync(name).get();
@@ -1435,6 +1523,8 @@ public final OperationFuture deleteInstanceAsync(InstanceName name)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]").toString();
    *   cloudRedisClient.deleteInstanceAsync(name).get();
@@ -1458,6 +1548,8 @@ public final OperationFuture deleteInstanceAsync(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   DeleteInstanceRequest request =
    *       DeleteInstanceRequest.newBuilder()
@@ -1481,6 +1573,8 @@ public final OperationFuture deleteInstanceAsync(DeleteInstanceReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   DeleteInstanceRequest request =
    *       DeleteInstanceRequest.newBuilder()
@@ -1505,6 +1599,8 @@ public final OperationFuture deleteInstanceAsync(DeleteInstanceReque
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   DeleteInstanceRequest request =
    *       DeleteInstanceRequest.newBuilder()
@@ -1527,6 +1623,8 @@ public final UnaryCallable deleteInstanceCalla
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
    *   RescheduleMaintenanceRequest.RescheduleType rescheduleType =
@@ -1566,6 +1664,8 @@ public final OperationFuture rescheduleMaintenanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   String name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]").toString();
    *   RescheduleMaintenanceRequest.RescheduleType rescheduleType =
@@ -1605,6 +1705,8 @@ public final OperationFuture rescheduleMaintenanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   RescheduleMaintenanceRequest request =
    *       RescheduleMaintenanceRequest.newBuilder()
@@ -1630,6 +1732,8 @@ public final OperationFuture rescheduleMaintenanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   RescheduleMaintenanceRequest request =
    *       RescheduleMaintenanceRequest.newBuilder()
@@ -1655,6 +1759,8 @@ public final OperationFuture rescheduleMaintenanceAsync(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
    *   RescheduleMaintenanceRequest request =
    *       RescheduleMaintenanceRequest.newBuilder()
diff --git a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisSettings.java b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisSettings.java
index 07b8a88495..fc98568148 100644
--- a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisSettings.java
+++ b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/CloudRedisSettings.java
@@ -57,6 +57,8 @@
  * 
For example, to set the total timeout of getInstance to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * CloudRedisSettings.Builder cloudRedisSettingsBuilder = CloudRedisSettings.newBuilder();
  * cloudRedisSettingsBuilder
  *     .getInstanceSettings()
diff --git a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/package-info.java b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/package-info.java
index 2e50fe5c8e..9b934c1ddd 100644
--- a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/package-info.java
+++ b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/package-info.java
@@ -45,6 +45,8 @@
  * 
Sample for CloudRedisClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
  *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
  *   Instance response = cloudRedisClient.getInstance(name);
diff --git a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/stub/CloudRedisStubSettings.java b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/stub/CloudRedisStubSettings.java
index 47b3185610..05ce9661a9 100644
--- a/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/stub/CloudRedisStubSettings.java
+++ b/test/integration/goldens/redis/com/google/cloud/redis/v1beta1/stub/CloudRedisStubSettings.java
@@ -88,6 +88,8 @@
  * 
For example, to set the total timeout of getInstance to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * CloudRedisStubSettings.Builder cloudRedisSettingsBuilder = CloudRedisStubSettings.newBuilder();
  * cloudRedisSettingsBuilder
  *     .getInstanceSettings()
diff --git a/test/integration/goldens/storage/com/google/storage/v2/StorageClient.java b/test/integration/goldens/storage/com/google/storage/v2/StorageClient.java
index 730ab88f39..7ac3053780 100644
--- a/test/integration/goldens/storage/com/google/storage/v2/StorageClient.java
+++ b/test/integration/goldens/storage/com/google/storage/v2/StorageClient.java
@@ -65,6 +65,8 @@
  * calls that map to API methods. Sample code to get started:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (StorageClient storageClient = StorageClient.create()) {
  *   BucketName name = BucketName.of("[PROJECT]", "[BUCKET]");
  *   storageClient.deleteBucket(name);
@@ -100,6 +102,8 @@
  * 
To customize credentials:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * StorageSettings storageSettings =
  *     StorageSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -110,6 +114,8 @@
  * 
To customize the endpoint:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * StorageSettings storageSettings = StorageSettings.newBuilder().setEndpoint(myEndpoint).build();
  * StorageClient storageClient = StorageClient.create(storageSettings);
  * }

@@ -174,6 +180,8 @@ public StorageStub getStub() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   BucketName name = BucketName.of("[PROJECT]", "[BUCKET]");
    *   storageClient.deleteBucket(name);
@@ -196,6 +204,8 @@ public final void deleteBucket(BucketName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String name = BucketName.of("[PROJECT]", "[BUCKET]").toString();
    *   storageClient.deleteBucket(name);
@@ -217,6 +227,8 @@ public final void deleteBucket(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteBucketRequest request =
    *       DeleteBucketRequest.newBuilder()
@@ -243,6 +255,8 @@ public final void deleteBucket(DeleteBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteBucketRequest request =
    *       DeleteBucketRequest.newBuilder()
@@ -268,6 +282,8 @@ public final UnaryCallable deleteBucketCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   BucketName name = BucketName.of("[PROJECT]", "[BUCKET]");
    *   Bucket response = storageClient.getBucket(name);
@@ -290,6 +306,8 @@ public final Bucket getBucket(BucketName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String name = BucketName.of("[PROJECT]", "[BUCKET]").toString();
    *   Bucket response = storageClient.getBucket(name);
@@ -311,6 +329,8 @@ public final Bucket getBucket(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetBucketRequest request =
    *       GetBucketRequest.newBuilder()
@@ -338,6 +358,8 @@ public final Bucket getBucket(GetBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetBucketRequest request =
    *       GetBucketRequest.newBuilder()
@@ -364,6 +386,8 @@ public final UnaryCallable getBucketCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   Bucket bucket = Bucket.newBuilder().build();
@@ -397,6 +421,8 @@ public final Bucket createBucket(ProjectName parent, Bucket bucket, String bucke
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   Bucket bucket = Bucket.newBuilder().build();
@@ -430,6 +456,8 @@ public final Bucket createBucket(String parent, Bucket bucket, String bucketId)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   CreateBucketRequest request =
    *       CreateBucketRequest.newBuilder()
@@ -457,6 +485,8 @@ public final Bucket createBucket(CreateBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   CreateBucketRequest request =
    *       CreateBucketRequest.newBuilder()
@@ -483,6 +513,8 @@ public final UnaryCallable createBucketCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (Bucket element : storageClient.listBuckets(parent).iterateAll()) {
@@ -509,6 +541,8 @@ public final ListBucketsPagedResponse listBuckets(ProjectName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (Bucket element : storageClient.listBuckets(parent).iterateAll()) {
@@ -532,6 +566,8 @@ public final ListBucketsPagedResponse listBuckets(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListBucketsRequest request =
    *       ListBucketsRequest.newBuilder()
@@ -562,6 +598,8 @@ public final ListBucketsPagedResponse listBuckets(ListBucketsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListBucketsRequest request =
    *       ListBucketsRequest.newBuilder()
@@ -592,6 +630,8 @@ public final ListBucketsPagedResponse listBuckets(ListBucketsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListBucketsRequest request =
    *       ListBucketsRequest.newBuilder()
@@ -628,6 +668,8 @@ public final UnaryCallable listBucketsC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   BucketName bucket = BucketName.of("[PROJECT]", "[BUCKET]");
    *   Bucket response = storageClient.lockBucketRetentionPolicy(bucket);
@@ -652,6 +694,8 @@ public final Bucket lockBucketRetentionPolicy(BucketName bucket) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String bucket = BucketName.of("[PROJECT]", "[BUCKET]").toString();
    *   Bucket response = storageClient.lockBucketRetentionPolicy(bucket);
@@ -674,6 +718,8 @@ public final Bucket lockBucketRetentionPolicy(String bucket) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   LockBucketRetentionPolicyRequest request =
    *       LockBucketRetentionPolicyRequest.newBuilder()
@@ -699,6 +745,8 @@ public final Bucket lockBucketRetentionPolicy(LockBucketRetentionPolicyRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   LockBucketRetentionPolicyRequest request =
    *       LockBucketRetentionPolicyRequest.newBuilder()
@@ -725,6 +773,8 @@ public final Bucket lockBucketRetentionPolicy(LockBucketRetentionPolicyRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ResourceName resource =
    *       CryptoKeyName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]", "[CRYPTO_KEY]");
@@ -751,6 +801,8 @@ public final Policy getIamPolicy(ResourceName resource) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String resource =
    *       CryptoKeyName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]", "[CRYPTO_KEY]").toString();
@@ -774,6 +826,8 @@ public final Policy getIamPolicy(String resource) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -800,6 +854,8 @@ public final Policy getIamPolicy(GetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetIamPolicyRequest request =
    *       GetIamPolicyRequest.newBuilder()
@@ -825,6 +881,8 @@ public final UnaryCallable getIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ResourceName resource =
    *       CryptoKeyName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]", "[CRYPTO_KEY]");
@@ -856,6 +914,8 @@ public final Policy setIamPolicy(ResourceName resource, Policy policy) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String resource =
    *       CryptoKeyName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]", "[CRYPTO_KEY]").toString();
@@ -884,6 +944,8 @@ public final Policy setIamPolicy(String resource, Policy policy) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -910,6 +972,8 @@ public final Policy setIamPolicy(SetIamPolicyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   SetIamPolicyRequest request =
    *       SetIamPolicyRequest.newBuilder()
@@ -935,6 +999,8 @@ public final UnaryCallable setIamPolicyCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ResourceName resource =
    *       CryptoKeyName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]", "[CRYPTO_KEY]");
@@ -967,6 +1033,8 @@ public final TestIamPermissionsResponse testIamPermissions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String resource =
    *       CryptoKeyName.of("[PROJECT]", "[LOCATION]", "[KEY_RING]", "[CRYPTO_KEY]").toString();
@@ -999,6 +1067,8 @@ public final TestIamPermissionsResponse testIamPermissions(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
@@ -1025,6 +1095,8 @@ public final TestIamPermissionsResponse testIamPermissions(TestIamPermissionsReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   TestIamPermissionsRequest request =
    *       TestIamPermissionsRequest.newBuilder()
@@ -1052,6 +1124,8 @@ public final TestIamPermissionsResponse testIamPermissions(TestIamPermissionsReq
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   Bucket bucket = Bucket.newBuilder().build();
    *   FieldMask updateMask = FieldMask.newBuilder().build();
@@ -1083,6 +1157,8 @@ public final Bucket updateBucket(Bucket bucket, FieldMask updateMask) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   UpdateBucketRequest request =
    *       UpdateBucketRequest.newBuilder()
@@ -1112,6 +1188,8 @@ public final Bucket updateBucket(UpdateBucketRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   UpdateBucketRequest request =
    *       UpdateBucketRequest.newBuilder()
@@ -1140,6 +1218,8 @@ public final UnaryCallable updateBucketCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   NotificationName name = NotificationName.of("[PROJECT]", "[BUCKET]", "[NOTIFICATION]");
    *   storageClient.deleteNotification(name);
@@ -1164,6 +1244,8 @@ public final void deleteNotification(NotificationName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String name = NotificationName.of("[PROJECT]", "[BUCKET]", "[NOTIFICATION]").toString();
    *   storageClient.deleteNotification(name);
@@ -1186,6 +1268,8 @@ public final void deleteNotification(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteNotificationRequest request =
    *       DeleteNotificationRequest.newBuilder()
@@ -1209,6 +1293,8 @@ public final void deleteNotification(DeleteNotificationRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteNotificationRequest request =
    *       DeleteNotificationRequest.newBuilder()
@@ -1231,6 +1317,8 @@ public final UnaryCallable deleteNotificationC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   BucketName name = BucketName.of("[PROJECT]", "[BUCKET]");
    *   Notification response = storageClient.getNotification(name);
@@ -1254,6 +1342,8 @@ public final Notification getNotification(BucketName name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String name = BucketName.of("[PROJECT]", "[BUCKET]").toString();
    *   Notification response = storageClient.getNotification(name);
@@ -1276,6 +1366,8 @@ public final Notification getNotification(String name) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetNotificationRequest request =
    *       GetNotificationRequest.newBuilder()
@@ -1299,6 +1391,8 @@ public final Notification getNotification(GetNotificationRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetNotificationRequest request =
    *       GetNotificationRequest.newBuilder()
@@ -1323,6 +1417,8 @@ public final UnaryCallable getNotification
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   Notification notification = Notification.newBuilder().build();
@@ -1352,6 +1448,8 @@ public final Notification createNotification(ProjectName parent, Notification no
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   Notification notification = Notification.newBuilder().build();
@@ -1381,6 +1479,8 @@ public final Notification createNotification(String parent, Notification notific
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   CreateNotificationRequest request =
    *       CreateNotificationRequest.newBuilder()
@@ -1407,6 +1507,8 @@ public final Notification createNotification(CreateNotificationRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   CreateNotificationRequest request =
    *       CreateNotificationRequest.newBuilder()
@@ -1431,6 +1533,8 @@ public final UnaryCallable createNotifi
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (Notification element : storageClient.listNotifications(parent).iterateAll()) {
@@ -1457,6 +1561,8 @@ public final ListNotificationsPagedResponse listNotifications(ProjectName parent
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (Notification element : storageClient.listNotifications(parent).iterateAll()) {
@@ -1481,6 +1587,8 @@ public final ListNotificationsPagedResponse listNotifications(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListNotificationsRequest request =
    *       ListNotificationsRequest.newBuilder()
@@ -1508,6 +1616,8 @@ public final ListNotificationsPagedResponse listNotifications(ListNotificationsR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListNotificationsRequest request =
    *       ListNotificationsRequest.newBuilder()
@@ -1536,6 +1646,8 @@ public final ListNotificationsPagedResponse listNotifications(ListNotificationsR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListNotificationsRequest request =
    *       ListNotificationsRequest.newBuilder()
@@ -1571,6 +1683,8 @@ public final ListNotificationsPagedResponse listNotifications(ListNotificationsR
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ComposeObjectRequest request =
    *       ComposeObjectRequest.newBuilder()
@@ -1603,6 +1717,8 @@ public final Object composeObject(ComposeObjectRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ComposeObjectRequest request =
    *       ComposeObjectRequest.newBuilder()
@@ -1635,6 +1751,8 @@ public final UnaryCallable composeObjectCallable()
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String bucket = "bucket-1378203158";
    *   String object = "object-1023368385";
@@ -1660,6 +1778,8 @@ public final void deleteObject(String bucket, String object) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String bucket = "bucket-1378203158";
    *   String object = "object-1023368385";
@@ -1692,6 +1812,8 @@ public final void deleteObject(String bucket, String object, long generation) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteObjectRequest request =
    *       DeleteObjectRequest.newBuilder()
@@ -1725,6 +1847,8 @@ public final void deleteObject(DeleteObjectRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteObjectRequest request =
    *       DeleteObjectRequest.newBuilder()
@@ -1756,6 +1880,8 @@ public final UnaryCallable deleteObjectCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String bucket = "bucket-1378203158";
    *   String object = "object-1023368385";
@@ -1780,6 +1906,8 @@ public final Object getObject(String bucket, String object) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String bucket = "bucket-1378203158";
    *   String object = "object-1023368385";
@@ -1811,6 +1939,8 @@ public final Object getObject(String bucket, String object, long generation) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetObjectRequest request =
    *       GetObjectRequest.newBuilder()
@@ -1843,6 +1973,8 @@ public final Object getObject(GetObjectRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetObjectRequest request =
    *       GetObjectRequest.newBuilder()
@@ -1874,6 +2006,8 @@ public final UnaryCallable getObjectCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ReadObjectRequest request =
    *       ReadObjectRequest.newBuilder()
@@ -1908,6 +2042,8 @@ public final ServerStreamingCallable read
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   Object object = Object.newBuilder().build();
    *   FieldMask updateMask = FieldMask.newBuilder().build();
@@ -1941,6 +2077,8 @@ public final Object updateObject(Object object, FieldMask updateMask) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   UpdateObjectRequest request =
    *       UpdateObjectRequest.newBuilder()
@@ -1972,6 +2110,8 @@ public final Object updateObject(UpdateObjectRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   UpdateObjectRequest request =
    *       UpdateObjectRequest.newBuilder()
@@ -2021,6 +2161,8 @@ public final UnaryCallable updateObjectCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ApiStreamObserver responseObserver =
    *       new ApiStreamObserver() {
@@ -2065,6 +2207,8 @@ public final UnaryCallable updateObjectCallable() {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName parent = ProjectName.of("[PROJECT]");
    *   for (Object element : storageClient.listObjects(parent).iterateAll()) {
@@ -2091,6 +2235,8 @@ public final ListObjectsPagedResponse listObjects(ProjectName parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String parent = ProjectName.of("[PROJECT]").toString();
    *   for (Object element : storageClient.listObjects(parent).iterateAll()) {
@@ -2114,6 +2260,8 @@ public final ListObjectsPagedResponse listObjects(String parent) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListObjectsRequest request =
    *       ListObjectsRequest.newBuilder()
@@ -2149,6 +2297,8 @@ public final ListObjectsPagedResponse listObjects(ListObjectsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListObjectsRequest request =
    *       ListObjectsRequest.newBuilder()
@@ -2184,6 +2334,8 @@ public final ListObjectsPagedResponse listObjects(ListObjectsRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListObjectsRequest request =
    *       ListObjectsRequest.newBuilder()
@@ -2225,6 +2377,8 @@ public final UnaryCallable listObjectsC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   RewriteObjectRequest request =
    *       RewriteObjectRequest.newBuilder()
@@ -2272,6 +2426,8 @@ public final RewriteResponse rewriteObject(RewriteObjectRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   RewriteObjectRequest request =
    *       RewriteObjectRequest.newBuilder()
@@ -2319,6 +2475,8 @@ public final UnaryCallable rewriteObjectC
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   StartResumableWriteRequest request =
    *       StartResumableWriteRequest.newBuilder()
@@ -2345,6 +2503,8 @@ public final StartResumableWriteResponse startResumableWrite(StartResumableWrite
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   StartResumableWriteRequest request =
    *       StartResumableWriteRequest.newBuilder()
@@ -2381,6 +2541,8 @@ public final StartResumableWriteResponse startResumableWrite(StartResumableWrite
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String uploadId = "uploadId1563990780";
    *   QueryWriteStatusResponse response = storageClient.queryWriteStatus(uploadId);
@@ -2414,6 +2576,8 @@ public final QueryWriteStatusResponse queryWriteStatus(String uploadId) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   QueryWriteStatusRequest request =
    *       QueryWriteStatusRequest.newBuilder()
@@ -2449,6 +2613,8 @@ public final QueryWriteStatusResponse queryWriteStatus(QueryWriteStatusRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   QueryWriteStatusRequest request =
    *       QueryWriteStatusRequest.newBuilder()
@@ -2475,6 +2641,8 @@ public final QueryWriteStatusResponse queryWriteStatus(QueryWriteStatusRequest r
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName project = ProjectName.of("[PROJECT]");
    *   ServiceAccount response = storageClient.getServiceAccount(project);
@@ -2499,6 +2667,8 @@ public final ServiceAccount getServiceAccount(ProjectName project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String project = ProjectName.of("[PROJECT]").toString();
    *   ServiceAccount response = storageClient.getServiceAccount(project);
@@ -2521,6 +2691,8 @@ public final ServiceAccount getServiceAccount(String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetServiceAccountRequest request =
    *       GetServiceAccountRequest.newBuilder()
@@ -2545,6 +2717,8 @@ public final ServiceAccount getServiceAccount(GetServiceAccountRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetServiceAccountRequest request =
    *       GetServiceAccountRequest.newBuilder()
@@ -2569,6 +2743,8 @@ public final UnaryCallable getServiceA
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName project = ProjectName.of("[PROJECT]");
    *   String serviceAccountEmail = "serviceAccountEmail1825953988";
@@ -2597,6 +2773,8 @@ public final CreateHmacKeyResponse createHmacKey(
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String project = ProjectName.of("[PROJECT]").toString();
    *   String serviceAccountEmail = "serviceAccountEmail1825953988";
@@ -2624,6 +2802,8 @@ public final CreateHmacKeyResponse createHmacKey(String project, String serviceA
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   CreateHmacKeyRequest request =
    *       CreateHmacKeyRequest.newBuilder()
@@ -2649,6 +2829,8 @@ public final CreateHmacKeyResponse createHmacKey(CreateHmacKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   CreateHmacKeyRequest request =
    *       CreateHmacKeyRequest.newBuilder()
@@ -2674,6 +2856,8 @@ public final UnaryCallable createHm
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String accessId = "accessId-2146437729";
    *   ProjectName project = ProjectName.of("[PROJECT]");
@@ -2701,6 +2885,8 @@ public final void deleteHmacKey(String accessId, ProjectName project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String accessId = "accessId-2146437729";
    *   String project = ProjectName.of("[PROJECT]").toString();
@@ -2725,6 +2911,8 @@ public final void deleteHmacKey(String accessId, String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteHmacKeyRequest request =
    *       DeleteHmacKeyRequest.newBuilder()
@@ -2750,6 +2938,8 @@ public final void deleteHmacKey(DeleteHmacKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   DeleteHmacKeyRequest request =
    *       DeleteHmacKeyRequest.newBuilder()
@@ -2774,6 +2964,8 @@ public final UnaryCallable deleteHmacKeyCallable()
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String accessId = "accessId-2146437729";
    *   ProjectName project = ProjectName.of("[PROJECT]");
@@ -2801,6 +2993,8 @@ public final HmacKeyMetadata getHmacKey(String accessId, ProjectName project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String accessId = "accessId-2146437729";
    *   String project = ProjectName.of("[PROJECT]").toString();
@@ -2825,6 +3019,8 @@ public final HmacKeyMetadata getHmacKey(String accessId, String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetHmacKeyRequest request =
    *       GetHmacKeyRequest.newBuilder()
@@ -2850,6 +3046,8 @@ public final HmacKeyMetadata getHmacKey(GetHmacKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   GetHmacKeyRequest request =
    *       GetHmacKeyRequest.newBuilder()
@@ -2874,6 +3072,8 @@ public final UnaryCallable getHmacKeyCallabl
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ProjectName project = ProjectName.of("[PROJECT]");
    *   for (HmacKeyMetadata element : storageClient.listHmacKeys(project).iterateAll()) {
@@ -2900,6 +3100,8 @@ public final ListHmacKeysPagedResponse listHmacKeys(ProjectName project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   String project = ProjectName.of("[PROJECT]").toString();
    *   for (HmacKeyMetadata element : storageClient.listHmacKeys(project).iterateAll()) {
@@ -2923,6 +3125,8 @@ public final ListHmacKeysPagedResponse listHmacKeys(String project) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListHmacKeysRequest request =
    *       ListHmacKeysRequest.newBuilder()
@@ -2953,6 +3157,8 @@ public final ListHmacKeysPagedResponse listHmacKeys(ListHmacKeysRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListHmacKeysRequest request =
    *       ListHmacKeysRequest.newBuilder()
@@ -2984,6 +3190,8 @@ public final ListHmacKeysPagedResponse listHmacKeys(ListHmacKeysRequest request)
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   ListHmacKeysRequest request =
    *       ListHmacKeysRequest.newBuilder()
@@ -3020,6 +3228,8 @@ public final UnaryCallable listHmacKe
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   HmacKeyMetadata hmacKey = HmacKeyMetadata.newBuilder().build();
    *   FieldMask updateMask = FieldMask.newBuilder().build();
@@ -3046,6 +3256,8 @@ public final HmacKeyMetadata updateHmacKey(HmacKeyMetadata hmacKey, FieldMask up
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   UpdateHmacKeyRequest request =
    *       UpdateHmacKeyRequest.newBuilder()
@@ -3071,6 +3283,8 @@ public final HmacKeyMetadata updateHmacKey(UpdateHmacKeyRequest request) {
    * 
Sample code:
    *
    * 
{@code
+   * // This snippet has been automatically generated for illustrative purposes only.
+   * // It may require modifications to work in your environment.
    * try (StorageClient storageClient = StorageClient.create()) {
    *   UpdateHmacKeyRequest request =
    *       UpdateHmacKeyRequest.newBuilder()
diff --git a/test/integration/goldens/storage/com/google/storage/v2/StorageSettings.java b/test/integration/goldens/storage/com/google/storage/v2/StorageSettings.java
index c1c35ab39b..63956a25a7 100644
--- a/test/integration/goldens/storage/com/google/storage/v2/StorageSettings.java
+++ b/test/integration/goldens/storage/com/google/storage/v2/StorageSettings.java
@@ -64,6 +64,8 @@
  * 
For example, to set the total timeout of deleteBucket to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * StorageSettings.Builder storageSettingsBuilder = StorageSettings.newBuilder();
  * storageSettingsBuilder
  *     .deleteBucketSettings()
diff --git a/test/integration/goldens/storage/com/google/storage/v2/package-info.java b/test/integration/goldens/storage/com/google/storage/v2/package-info.java
index c9655f85d2..b303dd1e34 100644
--- a/test/integration/goldens/storage/com/google/storage/v2/package-info.java
+++ b/test/integration/goldens/storage/com/google/storage/v2/package-info.java
@@ -38,6 +38,8 @@
  * 
Sample for StorageClient:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * try (StorageClient storageClient = StorageClient.create()) {
  *   BucketName name = BucketName.of("[PROJECT]", "[BUCKET]");
  *   storageClient.deleteBucket(name);
diff --git a/test/integration/goldens/storage/com/google/storage/v2/stub/StorageStubSettings.java b/test/integration/goldens/storage/com/google/storage/v2/stub/StorageStubSettings.java
index 25e85c92be..5e786e6bca 100644
--- a/test/integration/goldens/storage/com/google/storage/v2/stub/StorageStubSettings.java
+++ b/test/integration/goldens/storage/com/google/storage/v2/stub/StorageStubSettings.java
@@ -119,6 +119,8 @@
  * 
For example, to set the total timeout of deleteBucket to 30 seconds:
  *
  * 
{@code
+ * // This snippet has been automatically generated for illustrative purposes only.
+ * // It may require modifications to work in your environment.
  * StorageStubSettings.Builder storageSettingsBuilder = StorageStubSettings.newBuilder();
  * storageSettingsBuilder
  *     .deleteBucketSettings()