diff --git a/src/main/java/com/google/api/generator/gapic/composer/ClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ClassComposer.java
index 5579c1bd6e..46b6180965 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/ClassComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/ClassComposer.java
@@ -22,5 +22,7 @@
 
 public interface ClassComposer {
   GapicClass generate(
+      // TODO(miraleung): clean up the hierarchy to avoid pass another parameter (resourceNames is
+      // only used for composing sample code).
       Service service, Map<String, Message> messageTypes, Map<String, ResourceName> resourceNames);
 }
diff --git a/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java b/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java
index 00c34e2165..443dd68fff 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java
@@ -16,6 +16,8 @@
 
 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.LineComment;
 import com.google.api.generator.engine.ast.MethodInvocationExpr;
 import com.google.api.generator.engine.ast.TryCatchStatement;
@@ -26,17 +28,26 @@
 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 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 final class SampleCodeHelperComposer {
+  private static String RESPONSE = "response";
 
   public static TryCatchStatement composeRpcMethodSampleCode(
       Method method,
       List<MethodArgument> arguments,
       TypeNode clientType,
       Map<String, ResourceName> resourceNames) {
+    Preconditions.checkState(
+        !arguments.isEmpty(),
+        "If method %s's arguments is none, it should pass %s as argument.",
+        method.name(),
+        method.inputType().reference().name());
     // Paged Unary RPC method.
     if (method.isPaged()) {
       return composePagedUnaryRpcMethodSampleCode(method, arguments, clientType, resourceNames);
@@ -71,14 +82,45 @@ private static TryCatchStatement composeUnaryRpcMethodSampleCode(
       List<MethodArgument> arguments,
       TypeNode clientType,
       Map<String, ResourceName> resourceNames) {
-    // TODO(summerji): compose sample code for unary rpc method.
     VariableExpr clientVarExpr = createVariableExpr(getClientName(clientType), clientType);
+    // Assign each method arguments with its default value.
+    Map<String, VariableExpr> methodArgVarExprMap = mapMethodArgumentsToVariableExprs(arguments);
+    List<Expr> methodArgumentsAssignmentExpr =
+        assignMethodArgumentsWithDefaultValues(arguments, methodArgVarExprMap, resourceNames);
+    List<Expr> methodVarExprs =
+        arguments.stream()
+            .map(arg -> methodArgVarExprMap.get(arg.name()))
+            .collect(Collectors.toList());
+    // 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());
+    Expr responseExpr = null;
+    if (returnsVoid) {
+      responseExpr =
+          MethodInvocationExpr.builder()
+              .setExprReferenceExpr(clientVarExpr)
+              .setMethodName(JavaStyle.toLowerCamelCase(method.name()))
+              .setArguments(methodVarExprs)
+              .setReturnType(clientType)
+              .build();
+    } else {
+      responseExpr =
+          createAssignExprForVariableWithClientMethod(
+              createVariableExpr(RESPONSE, method.outputType()),
+              clientVarExpr,
+              JavaStyle.toLowerCamelCase(method.name()),
+              methodVarExprs);
+    }
+
+    List<Expr> bodyExpr = new ArrayList<>();
+    bodyExpr.addAll(methodArgumentsAssignmentExpr);
+    bodyExpr.add(responseExpr);
+
     return TryCatchStatement.builder()
         .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
         .setTryBody(
-            Arrays.asList(
-                createLineCommentStatement(
-                    "Note: Not implemented yet, placeholder for pure unary rpc method sample code.")))
+            bodyExpr.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList()))
         .setIsSampleCode(true)
         .build();
   }
@@ -89,6 +131,7 @@ private static TryCatchStatement composeLroUnaryRpcMethodSampleCode(
       TypeNode clientType,
       Map<String, ResourceName> resourceNames) {
     // TODO(summerji): compose sample code for unary lro rpc method.
+    // TODO(summerji): Add unit tests.
     VariableExpr clientVarExpr = createVariableExpr(getClientName(clientType), clientType);
     return TryCatchStatement.builder()
         .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
@@ -106,6 +149,7 @@ private static TryCatchStatement composePagedUnaryRpcMethodSampleCode(
       TypeNode clientType,
       Map<String, ResourceName> resourceNames) {
     // TODO(summerji): compose sample code for unary paged rpc method.
+    // TODO(summerji): Add unit tests.
     VariableExpr clientVarExpr = createVariableExpr(getClientName(clientType), clientType);
     return TryCatchStatement.builder()
         .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientVarExpr))
@@ -116,7 +160,6 @@ private static TryCatchStatement composePagedUnaryRpcMethodSampleCode(
         .setIsSampleCode(true)
         .build();
   }
-
   // ==================================Helpers===================================================//
 
   // Assign client variable expr with create client.
@@ -134,6 +177,55 @@ private static AssignmentExpr assignClientVariableWithCreateMethodExpr(
         .build();
   }
 
+  private static List<Expr> assignMethodArgumentsWithDefaultValues(
+      List<MethodArgument> arguments,
+      Map<String, VariableExpr> argVarExprs,
+      Map<String, ResourceName> resourceNames) {
+    return arguments.stream()
+        .map(
+            arg ->
+                createAssignmentExpr(
+                    argVarExprs.get(arg.name()),
+                    DefaultValueComposer.createDefaultValue(arg, resourceNames)))
+        .collect(Collectors.toList());
+  }
+
+  private static AssignmentExpr createAssignmentExpr(VariableExpr variableExpr, Expr valueExpr) {
+    return AssignmentExpr.builder()
+        .setVariableExpr(variableExpr.toBuilder().setIsDecl(true).build())
+        .setValueExpr(valueExpr)
+        .build();
+  }
+
+  private static Expr createAssignExprForVariableWithClientMethod(
+      VariableExpr variableExpr,
+      VariableExpr clientVarExpr,
+      String methodName,
+      List<Expr> argumentsVarExprs) {
+    MethodInvocationExpr clientMethodInvocationExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(clientVarExpr)
+            .setMethodName(JavaStyle.toLowerCamelCase(methodName))
+            .setArguments(argumentsVarExprs)
+            .setReturnType(variableExpr.variable().type())
+            .build();
+    return AssignmentExpr.builder()
+        .setVariableExpr(variableExpr.toBuilder().setIsDecl(true).build())
+        .setValueExpr(clientMethodInvocationExpr)
+        .build();
+  }
+
+  private static Map<String, VariableExpr> mapMethodArgumentsToVariableExprs(
+      List<MethodArgument> arguments) {
+    return arguments.stream()
+        .collect(
+            Collectors.toMap(
+                methodArg -> methodArg.name(),
+                methodArg ->
+                    createVariableExpr(
+                        JavaStyle.toLowerCamelCase(methodArg.name()), methodArg.type())));
+  }
+
   private static String getClientName(TypeNode clientType) {
     return JavaStyle.toLowerCamelCase(clientType.reference().name());
   }
@@ -157,4 +249,9 @@ private static VariableExpr createVariableExpr(
         .setIsDecl(isDecl)
         .build();
   }
+
+  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/ServiceClientSampleCodeComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientSampleCodeComposer.java
index e09c1f22ab..0b050841e8 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/ServiceClientSampleCodeComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientSampleCodeComposer.java
@@ -1,6 +1,6 @@
 // Copyright 2020 Google LLC
 //
-// Licensed under the Apache License, Version 2.0 (the "License");\
+// 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
 //
diff --git a/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel b/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel
index 0e0e941a90..dd574a567e 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel
+++ b/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel
@@ -22,6 +22,7 @@ TESTS = UPDATE_GOLDENS_TESTS + [
     "DefaultValueComposerTest",
     "ResourceNameTokenizerTest",
     "RetrySettingsComposerTest",
+    "SampleCodeHelperComposerTest"
 ]
 
 TEST_DEPS = [
@@ -38,6 +39,7 @@ TEST_DEPS = [
     "//src/main/java/com/google/api/generator/gapic/protoparser",
     "//src/test/java/com/google/api/generator/gapic/testdata:showcase_java_proto",
     "//src/test/java/com/google/api/generator/gapic/testdata:testgapic_java_proto",
+    "@com_google_api_api_common//jar",
     "@com_google_api_gax_java//gax",
     "@com_google_googleapis//google/logging/v2:logging_java_proto",
     "@com_google_googleapis//google/pubsub/v1:pubsub_java_proto",
diff --git a/src/test/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposerTest.java
new file mode 100644
index 0000000000..4678fa8294
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposerTest.java
@@ -0,0 +1,485 @@
+// 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;
+
+import static junit.framework.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.composer.samplecode.SampleCodeWriter;
+import com.google.api.generator.gapic.model.Field;
+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.ResourceReference;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class SampleCodeHelperComposerTest {
+  private static final String PACKAGE_NAME = "com.google.showcase.v1beta1";
+  private static final TypeNode clientType =
+      TypeNode.withReference(
+          VaporReference.builder().setName("EchoClient").setPakkage(PACKAGE_NAME).build());
+  Map<String, ResourceName> resourceNames = new HashMap<>();
+
+  @Before
+  public void setUp() {
+    ResourceName foobarResourceName =
+        ResourceName.builder()
+            .setVariableName("foobar")
+            .setPakkage(PACKAGE_NAME)
+            .setResourceTypeString("showcase.googleapis.com/Foobar")
+            .setPatterns(
+                Arrays.asList(
+                    "projects/{project}/foobars/{foobar}",
+                    "projects/{project}/chocolate/variants/{variant}/foobars/{foobar}",
+                    "foobars/{foobar}",
+                    "bar_foo/{bar_foo}/foobars/{foobar}"))
+            .setParentMessageName("Foobar")
+            .build();
+    ResourceName anythingGoesResourceName =
+        ResourceName.createWildcard("showcase.googleapis.com/AnythingGoes", PACKAGE_NAME);
+    resourceNames.put("showcase.googleapis.com/Foobar", foobarResourceName);
+    resourceNames.put("showcase.googleapis.com/AnythingGoes", anythingGoesResourceName);
+  }
+
+  @Test
+  public void composeUnaryRpcMethodSampleCode_resourceNameHelperMethodArgument() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(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<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "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 composeUnaryRpcMethodSampleCode_isMessageMethodArgument() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(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<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "try (EchoClient echoClient = EchoClient.create()) {\n"
+            + "  Status error = Status.newBuilder().build();\n"
+            + "  EchoResponse response = echoClient.echo(error);\n"
+            + "}";
+    assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeUnaryRpcMethodSampleCode_superReferenceIsResourceNameMethodArgument() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(PACKAGE_NAME).build());
+    TypeNode methodArgType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("FoobarName")
+                .setPakkage(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<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "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 composeUnaryRpcMethodSampleCode_stringIsContainedInOneOfMethodArgument() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(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<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "try (EchoClient echoClient = EchoClient.create()) {\n"
+            + "  String content = \"content951530617\";\n"
+            + "  EchoResponse response = echoClient.echo(content);\n"
+            + "}";
+    assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeUnaryRpcMethodSampleCode_strinWithResourceReferenceMethodArgument() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(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<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "try (EchoClient echoClient = EchoClient.create()) {\n"
+            + "  String name = \"name3373707\";\n"
+            + "  EchoResponse response = echoClient.echo(name);\n"
+            + "}";
+    assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeUnaryRpcMethodSampleCode_stringWithParentResourceReferenceMethodArgument() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(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<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "try (EchoClient echoClient = EchoClient.create()) {\n"
+            + "  String parent = \"parent-995424086\";\n"
+            + "  EchoResponse response = echoClient.echo(parent);\n"
+            + "}";
+    assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeUnaryRpcMethodSampleCode_multipleWordNameMethodArgument() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(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(PACKAGE_NAME).build();
+    Field nestFiled =
+        Field.builder()
+            .setName("user")
+            .setType(TypeNode.withReference(userRef))
+            .setIsMessage(true)
+            .build();
+    MethodArgument arg =
+        MethodArgument.builder()
+            .setName("display_name")
+            .setType(TypeNode.STRING)
+            .setField(methodArgField)
+            .setNestedFields(Arrays.asList(nestFiled))
+            .build();
+    List<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "try (EchoClient echoClient = EchoClient.create()) {\n"
+            + "  String displayName = \"display_name1615086568\";\n"
+            + "  EchoResponse response = echoClient.echo(displayName);\n"
+            + "}";
+    assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeUnaryRpcMethodSampleCode_multipleMethodArguments() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoRequest").setPakkage(PACKAGE_NAME).build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(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(PACKAGE_NAME).build());
+    MethodArgument arg2 =
+        MethodArgument.builder()
+            .setName("severity")
+            .setType(severityType)
+            .setField(
+                Field.builder().setName("severity").setType(severityType).setIsEnum(true).build())
+            .build();
+    List<List<MethodArgument>> signatures = Arrays.asList(Arrays.asList(arg1, arg2));
+    Method unaryMethod =
+        Method.builder()
+            .setName("echo")
+            .setMethodSignatures(signatures)
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    String results =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, signatures.get(0), clientType, resourceNames));
+    String expected =
+        "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 composeUnaryRpcMethodSampleCode_noMethodArguments() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("GetUserRequest")
+                .setPakkage("com.google.showcase.v1beta1")
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("GetUserResponse")
+                .setPakkage("com.google.showcase.v1beta1")
+                .build());
+    Method unaryMethod =
+        Method.builder()
+            .setName("getUser")
+            .setMethodSignatures(Collections.emptyList())
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .build();
+    assertThrows(
+        IllegalStateException.class,
+        () ->
+            SampleCodeWriter.write(
+                SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                    unaryMethod, Collections.emptyList(), clientType, resourceNames)));
+  }
+
+  @Test
+  public void composeUnaryRpcMethodSampleCode_methodReturnVoid() {
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("DeleteUserRequest")
+                .setPakkage("com.google.showcase.v1beta1")
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Empty").setPakkage("com.google.protobuf").build());
+    List<List<MethodArgument>> 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 =
+        SampleCodeWriter.write(
+            SampleCodeHelperComposer.composeRpcMethodSampleCode(
+                unaryMethod, methodSignatures.get(0), clientType, resourceNames));
+    String expected =
+        "try (EchoClient echoClient = EchoClient.create()) {\n"
+            + "  String name = \"name3373707\";\n"
+            + "  echoClient.delete(name);\n"
+            + "}";
+    Assert.assertEquals(results, expected);
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
index bf4c69bc42..91d56b1b62 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
@@ -147,7 +147,8 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   ResourceName parent = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]");
+   *   EchoResponse response = echoClient.echo(parent);
    * }
    * }</pre>
    *
@@ -168,7 +169,8 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   Status error = Status.newBuilder().build();
+   *   EchoResponse response = echoClient.echo(error);
    * }
    * }</pre>
    *
@@ -186,7 +188,8 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   FoobarName name = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]");
+   *   EchoResponse response = echoClient.echo(name);
    * }
    * }</pre>
    *
@@ -205,7 +208,8 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String content = "content951530617";
+   *   EchoResponse response = echoClient.echo(content);
    * }
    * }</pre>
    *
@@ -223,7 +227,8 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   EchoResponse response = echoClient.echo(name);
    * }
    * }</pre>
    *
@@ -241,7 +246,8 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   EchoResponse response = echoClient.echo(parent);
    * }
    * }</pre>
    *
@@ -259,7 +265,9 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String content = "content951530617";
+   *   Severity severity = Severity.forNumber(0);
+   *   EchoResponse response = echoClient.echo(content, severity);
    * }
    * }</pre>
    *
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
index b52c927a08..b238f27485 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
@@ -127,7 +127,10 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   String displayName = "display_name1615086568";
+   *   String email = "email96619420";
+   *   User response = identityClient.createUser(parent, displayName, email);
    * }
    * }</pre>
    *
@@ -152,7 +155,16 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   String displayName = "display_name1615086568";
+   *   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);
    * }
    * }</pre>
    *
@@ -215,7 +227,8 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   UserName name = UserName.of("[USER]");
+   *   User response = identityClient.getUser(name);
    * }
    * }</pre>
    *
@@ -234,7 +247,8 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   User response = identityClient.getUser(name);
    * }
    * }</pre>
    *
@@ -298,7 +312,8 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   UserName name = UserName.of("[USER]");
+   *   identityClient.deleteUser(name);
    * }
    * }</pre>
    *
@@ -319,7 +334,8 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   identityClient.deleteUser(name);
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/asset/AssetServiceClient.java b/test/integration/goldens/asset/AssetServiceClient.java
index b4db49d5e5..82e033948b 100644
--- a/test/integration/goldens/asset/AssetServiceClient.java
+++ b/test/integration/goldens/asset/AssetServiceClient.java
@@ -264,7 +264,8 @@ public final BatchGetAssetsHistoryResponse batchGetAssetsHistory(
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   Feed response = assetServiceClient.createFeed(parent);
    * }
    * }</pre>
    *
@@ -316,7 +317,8 @@ public final UnaryCallable<CreateFeedRequest, Feed> createFeedCallable() {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   FeedName name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]");
+   *   Feed response = assetServiceClient.getFeed(name);
    * }
    * }</pre>
    *
@@ -339,7 +341,8 @@ public final Feed getFeed(FeedName name) {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   Feed response = assetServiceClient.getFeed(name);
    * }
    * }</pre>
    *
@@ -390,7 +393,8 @@ public final UnaryCallable<GetFeedRequest, Feed> getFeedCallable() {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   ListFeedsResponse response = assetServiceClient.listFeeds(parent);
    * }
    * }</pre>
    *
@@ -441,7 +445,8 @@ public final UnaryCallable<ListFeedsRequest, ListFeedsResponse> listFeedsCallabl
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   Feed feed = Feed.newBuilder().build();
+   *   Feed response = assetServiceClient.updateFeed(feed);
    * }
    * }</pre>
    *
@@ -492,7 +497,8 @@ public final UnaryCallable<UpdateFeedRequest, Feed> updateFeedCallable() {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   FeedName name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]");
+   *   assetServiceClient.deleteFeed(name);
    * }
    * }</pre>
    *
@@ -517,7 +523,8 @@ public final void deleteFeed(FeedName name) {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   assetServiceClient.deleteFeed(name);
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/logging/ConfigServiceV2Client.java b/test/integration/goldens/logging/ConfigServiceV2Client.java
index abb28b82cc..857ced6fd5 100644
--- a/test/integration/goldens/logging/ConfigServiceV2Client.java
+++ b/test/integration/goldens/logging/ConfigServiceV2Client.java
@@ -572,7 +572,8 @@ public final UnaryCallable<ListSinksRequest, ListSinksResponse> listSinksCallabl
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
+   *   LogSink response = configServiceV2Client.getSink(sinkName);
    * }
    * }</pre>
    *
@@ -600,7 +601,8 @@ public final LogSink getSink(LogSinkName sinkName) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String sinkName = "sink_name-1391757129";
+   *   LogSink response = configServiceV2Client.getSink(sinkName);
    * }
    * }</pre>
    *
@@ -657,7 +659,9 @@ public final UnaryCallable<GetSinkRequest, LogSink> getSinkCallable() {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   LogSink response = configServiceV2Client.createSink(parent, sink);
    * }
    * }</pre>
    *
@@ -689,7 +693,9 @@ public final LogSink createSink(BillingAccountName parent, LogSink sink) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   FolderName parent = FolderName.of("[FOLDER]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   LogSink response = configServiceV2Client.createSink(parent, sink);
    * }
    * }</pre>
    *
@@ -721,7 +727,9 @@ public final LogSink createSink(FolderName parent, LogSink sink) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   OrganizationName parent = OrganizationName.of("[ORGANIZATION]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   LogSink response = configServiceV2Client.createSink(parent, sink);
    * }
    * }</pre>
    *
@@ -753,7 +761,9 @@ public final LogSink createSink(OrganizationName parent, LogSink sink) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   ProjectName parent = ProjectName.of("[PROJECT]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   LogSink response = configServiceV2Client.createSink(parent, sink);
    * }
    * }</pre>
    *
@@ -785,7 +795,9 @@ public final LogSink createSink(ProjectName parent, LogSink sink) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   LogSink response = configServiceV2Client.createSink(parent, sink);
    * }
    * }</pre>
    *
@@ -850,7 +862,9 @@ public final UnaryCallable<CreateSinkRequest, LogSink> createSinkCallable() {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   LogSink response = configServiceV2Client.updateSink(sinkName, sink);
    * }
    * }</pre>
    *
@@ -886,7 +900,9 @@ public final LogSink updateSink(LogSinkName sinkName, LogSink sink) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String sinkName = "sink_name-1391757129";
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   LogSink response = configServiceV2Client.updateSink(sinkName, sink);
    * }
    * }</pre>
    *
@@ -919,7 +935,10 @@ public final LogSink updateSink(String sinkName, LogSink sink) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   FieldMask updateMask = FieldMask.newBuilder().build();
+   *   LogSink response = configServiceV2Client.updateSink(sinkName, sink, updateMask);
    * }
    * }</pre>
    *
@@ -965,7 +984,10 @@ public final LogSink updateSink(LogSinkName sinkName, LogSink sink, FieldMask up
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String sinkName = "sink_name-1391757129";
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   FieldMask updateMask = FieldMask.newBuilder().build();
+   *   LogSink response = configServiceV2Client.updateSink(sinkName, sink, updateMask);
    * }
    * }</pre>
    *
@@ -1045,7 +1067,8 @@ public final UnaryCallable<UpdateSinkRequest, LogSink> updateSinkCallable() {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogSinkName sinkName = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
+   *   configServiceV2Client.deleteSink(sinkName);
    * }
    * }</pre>
    *
@@ -1075,7 +1098,8 @@ public final void deleteSink(LogSinkName sinkName) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String sinkName = "sink_name-1391757129";
+   *   configServiceV2Client.deleteSink(sinkName);
    * }
    * }</pre>
    *
@@ -1295,7 +1319,8 @@ public final ListExclusionsPagedResponse listExclusions(ListExclusionsRequest re
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
+   *   LogExclusion response = configServiceV2Client.getExclusion(name);
    * }
    * }</pre>
    *
@@ -1323,7 +1348,8 @@ public final LogExclusion getExclusion(LogExclusionName name) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   LogExclusion response = configServiceV2Client.getExclusion(name);
    * }
    * }</pre>
    *
@@ -1378,7 +1404,9 @@ public final UnaryCallable<GetExclusionRequest, LogExclusion> getExclusionCallab
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   LogExclusion response = configServiceV2Client.createExclusion(parent, exclusion);
    * }
    * }</pre>
    *
@@ -1408,7 +1436,9 @@ public final LogExclusion createExclusion(BillingAccountName parent, LogExclusio
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   FolderName parent = FolderName.of("[FOLDER]");
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   LogExclusion response = configServiceV2Client.createExclusion(parent, exclusion);
    * }
    * }</pre>
    *
@@ -1438,7 +1468,9 @@ public final LogExclusion createExclusion(FolderName parent, LogExclusion exclus
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   OrganizationName parent = OrganizationName.of("[ORGANIZATION]");
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   LogExclusion response = configServiceV2Client.createExclusion(parent, exclusion);
    * }
    * }</pre>
    *
@@ -1468,7 +1500,9 @@ public final LogExclusion createExclusion(OrganizationName parent, LogExclusion
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   ProjectName parent = ProjectName.of("[PROJECT]");
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   LogExclusion response = configServiceV2Client.createExclusion(parent, exclusion);
    * }
    * }</pre>
    *
@@ -1498,7 +1532,9 @@ public final LogExclusion createExclusion(ProjectName parent, LogExclusion exclu
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   LogExclusion response = configServiceV2Client.createExclusion(parent, exclusion);
    * }
    * }</pre>
    *
@@ -1555,7 +1591,10 @@ public final UnaryCallable<CreateExclusionRequest, LogExclusion> createExclusion
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   FieldMask updateMask = FieldMask.newBuilder().build();
+   *   LogExclusion response = configServiceV2Client.updateExclusion(name, exclusion, updateMask);
    * }
    * }</pre>
    *
@@ -1594,7 +1633,10 @@ public final LogExclusion updateExclusion(
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   FieldMask updateMask = FieldMask.newBuilder().build();
+   *   LogExclusion response = configServiceV2Client.updateExclusion(name, exclusion, updateMask);
    * }
    * }</pre>
    *
@@ -1662,7 +1704,8 @@ public final UnaryCallable<UpdateExclusionRequest, LogExclusion> updateExclusion
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
+   *   configServiceV2Client.deleteExclusion(name);
    * }
    * }</pre>
    *
@@ -1690,7 +1733,8 @@ public final void deleteExclusion(LogExclusionName name) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   configServiceV2Client.deleteExclusion(name);
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/logging/LoggingServiceV2Client.java b/test/integration/goldens/logging/LoggingServiceV2Client.java
index 8295abad48..ab78be2c23 100644
--- a/test/integration/goldens/logging/LoggingServiceV2Client.java
+++ b/test/integration/goldens/logging/LoggingServiceV2Client.java
@@ -157,7 +157,8 @@ public LoggingServiceV2Stub getStub() {
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
+   *   loggingServiceV2Client.deleteLog(logName);
    * }
    * }</pre>
    *
@@ -187,7 +188,8 @@ public final void deleteLog(LogName logName) {
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String logName = "log_name2013526694";
+   *   loggingServiceV2Client.deleteLog(logName);
    * }
    * }</pre>
    *
@@ -248,7 +250,12 @@ public final UnaryCallable<DeleteLogRequest, Empty> deleteLogCallable() {
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
+   *   MonitoredResource resource = MonitoredResource.newBuilder().build();
+   *   Map<String, String> labels = new HashMap<>();
+   *   List<LogEntry> entries = new ArrayList<>();
+   *   WriteLogEntriesResponse response =
+   *       loggingServiceV2Client.writeLogEntries(logName, resource, labels, entries);
    * }
    * }</pre>
    *
@@ -318,7 +325,12 @@ public final WriteLogEntriesResponse writeLogEntries(
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String logName = "log_name2013526694";
+   *   MonitoredResource resource = MonitoredResource.newBuilder().build();
+   *   Map<String, String> labels = new HashMap<>();
+   *   List<LogEntry> entries = new ArrayList<>();
+   *   WriteLogEntriesResponse response =
+   *       loggingServiceV2Client.writeLogEntries(logName, resource, labels, entries);
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/logging/MetricsServiceV2Client.java b/test/integration/goldens/logging/MetricsServiceV2Client.java
index c78c041cc6..5900ae89df 100644
--- a/test/integration/goldens/logging/MetricsServiceV2Client.java
+++ b/test/integration/goldens/logging/MetricsServiceV2Client.java
@@ -238,7 +238,8 @@ public final ListLogMetricsPagedResponse listLogMetrics(ListLogMetricsRequest re
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
+   *   LogMetric response = metricsServiceV2Client.getLogMetric(metricName);
    * }
    * }</pre>
    *
@@ -262,7 +263,8 @@ public final LogMetric getLogMetric(LogMetricName metricName) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String metricName = "metric_name-1737602118";
+   *   LogMetric response = metricsServiceV2Client.getLogMetric(metricName);
    * }
    * }</pre>
    *
@@ -313,7 +315,9 @@ public final UnaryCallable<GetLogMetricRequest, LogMetric> getLogMetricCallable(
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   ProjectName parent = ProjectName.of("[PROJECT]");
+   *   LogMetric metric = LogMetric.newBuilder().build();
+   *   LogMetric response = metricsServiceV2Client.createLogMetric(parent, metric);
    * }
    * }</pre>
    *
@@ -341,7 +345,9 @@ public final LogMetric createLogMetric(ProjectName parent, LogMetric metric) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   LogMetric metric = LogMetric.newBuilder().build();
+   *   LogMetric response = metricsServiceV2Client.createLogMetric(parent, metric);
    * }
    * }</pre>
    *
@@ -395,7 +401,9 @@ public final UnaryCallable<CreateLogMetricRequest, LogMetric> createLogMetricCal
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
+   *   LogMetric metric = LogMetric.newBuilder().build();
+   *   LogMetric response = metricsServiceV2Client.updateLogMetric(metricName, metric);
    * }
    * }</pre>
    *
@@ -424,7 +432,9 @@ public final LogMetric updateLogMetric(LogMetricName metricName, LogMetric metri
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String metricName = "metric_name-1737602118";
+   *   LogMetric metric = LogMetric.newBuilder().build();
+   *   LogMetric response = metricsServiceV2Client.updateLogMetric(metricName, metric);
    * }
    * }</pre>
    *
@@ -479,7 +489,8 @@ public final UnaryCallable<UpdateLogMetricRequest, LogMetric> updateLogMetricCal
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
+   *   metricsServiceV2Client.deleteLogMetric(metricName);
    * }
    * }</pre>
    *
@@ -503,7 +514,8 @@ public final void deleteLogMetric(LogMetricName metricName) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String metricName = "metric_name-1737602118";
+   *   metricsServiceV2Client.deleteLogMetric(metricName);
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/redis/CloudRedisClient.java b/test/integration/goldens/redis/CloudRedisClient.java
index 4dcb5689bf..7fb9c008a4 100644
--- a/test/integration/goldens/redis/CloudRedisClient.java
+++ b/test/integration/goldens/redis/CloudRedisClient.java
@@ -317,7 +317,8 @@ public final UnaryCallable<ListInstancesRequest, ListInstancesResponse> listInst
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
+   *   Instance response = cloudRedisClient.getInstance(name);
    * }
    * }</pre>
    *
@@ -342,7 +343,8 @@ public final Instance getInstance(InstanceName name) {
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not implemented yet, placeholder for pure unary rpc method sample code.
+   *   String name = "name3373707";
+   *   Instance response = cloudRedisClient.getInstance(name);
    * }
    * }</pre>
    *