diff --git a/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.Exceptions.cs b/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.Exceptions.cs
index 396357a5e24fce..d268205dce95ee 100644
--- a/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.Exceptions.cs
+++ b/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.Exceptions.cs
@@ -137,129 +137,6 @@ public class Class_ExtData_CtorParam
             public Class_ExtData_CtorParam(Dictionary<string, JsonElement> extensionData) { }
         }
 
-        [Fact]
-        public void AnonymousObject()
-        {
-            var obj = new { Prop = 5 };
-            Type objType = obj.GetType();
-
-            // 'Prop' property binds with a ctor arg called 'Prop'.
-
-            object newObj = JsonSerializer.Deserialize("{}", objType);
-            Assert.Equal(0, objType.GetProperty("Prop").GetValue(newObj));
-
-            newObj = JsonSerializer.Deserialize(@"{""Prop"":5}", objType);
-            Assert.Equal(5, objType.GetProperty("Prop").GetValue(newObj));
-        }
-
-        [Fact]
-        public void AnonymousObject_NamingPolicy()
-        {
-            const string Json = @"{""prop"":5}";
-
-            var obj = new { Prop = 5 };
-            Type objType = obj.GetType();
-
-            // 'Prop' property binds with a ctor arg called 'Prop'.
-
-            object newObj = JsonSerializer.Deserialize(Json, objType);
-            // Verify no match if no naming policy
-            Assert.Equal(0, objType.GetProperty("Prop").GetValue(newObj));
-
-            var options = new JsonSerializerOptions
-            {
-                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
-            };
-
-            newObj = JsonSerializer.Deserialize(Json, objType, options);
-            // Verify match with naming policy
-            Assert.Equal(5, objType.GetProperty("Prop").GetValue(newObj));
-        }
-
-#if NETCOREAPP // These require the C# 9.0 "record" feature which is not available for all TFMs.
-        private record MyRecord(int Prop);
-
-        [Fact]
-        public void Record()
-        {
-            // 'Prop' property binds with a ctor arg called 'Prop'.
-            MyRecord obj = JsonSerializer.Deserialize<MyRecord>("{}");
-            Assert.Equal(0, obj.Prop);
-
-            obj = JsonSerializer.Deserialize<MyRecord>(@"{""Prop"":5}");
-            Assert.Equal(5, obj.Prop);
-        }
-
-        public record AgeRecord(int age)
-        {
-            public string Age { get; set; } = age.ToString();
-        }
-
-        [Fact]
-        public void RecordWithSamePropertyNameDifferentTypes()
-        {
-            AgeRecord obj = JsonSerializer.Deserialize<AgeRecord>(@"{""age"":1}");
-            Assert.Equal(1, obj.age);
-        }
-
-        private record MyRecordWithUnboundCtorProperty(int IntProp1, int IntProp2)
-        {
-            public string StringProp { get; set; }
-        }
-
-        [Fact]
-        public void RecordWithAdditionalProperty()
-        {
-            MyRecordWithUnboundCtorProperty obj = JsonSerializer.Deserialize<MyRecordWithUnboundCtorProperty>(
-                @"{""IntProp1"":1,""IntProp2"":2,""StringProp"":""hello""}");
-
-            Assert.Equal(1, obj.IntProp1);
-            Assert.Equal(2, obj.IntProp2);
-
-            // StringProp is not bound to any constructor property.
-            Assert.Equal("hello", obj.StringProp);
-        }
-
-        [Fact]
-        public void Record_NamingPolicy()
-        {
-            const string Json = @"{""prop"":5}";
-
-            // 'Prop' property binds with a ctor arg called 'Prop'.
-
-            // Verify no match if no naming policy
-            MyRecord obj = JsonSerializer.Deserialize<MyRecord>(Json);
-            Assert.Equal(0, obj.Prop);
-
-            var options = new JsonSerializerOptions
-            {
-                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
-            };
-
-            // Verify match with naming policy
-            obj = JsonSerializer.Deserialize<MyRecord>(Json, options);
-            Assert.Equal(5, obj.Prop);
-        }
-#endif
-
-        [Fact]
-        public void PocoWithSamePropertyNameDifferentTypes()
-        {
-            AgePoco obj = JsonSerializer.Deserialize<AgePoco>(@"{""age"":1}");
-            Assert.Equal(1, obj.age);
-        }
-
-        private class AgePoco
-        {
-            public AgePoco(int age)
-            {
-                this.age = age;
-            }
-            public int age { get; set; }
-
-            public string Age { get; set; }
-        }
-
         [Fact]
         public async Task DeserializePathForObjectFails()
         {
diff --git a/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.ParameterMatching.cs b/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.ParameterMatching.cs
index 7cf574598d7e3f..b3315fc8871100 100644
--- a/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.ParameterMatching.cs
+++ b/src/libraries/System.Text.Json/tests/Serialization/ConstructorTests/ConstructorTests.ParameterMatching.cs
@@ -1013,5 +1013,126 @@ public async Task InvalidJsonFails()
             await Assert.ThrowsAsync<JsonException>(() => Serializer.DeserializeWrapper<Point_2D_Struct>("{x"));
             await Assert.ThrowsAsync<JsonException>(() => Serializer.DeserializeWrapper<Point_2D_Struct>("{true"));
         }
+
+        [Fact]
+        public void AnonymousObject()
+        {
+            var obj = new { Prop = 5 };
+            Type objType = obj.GetType();
+
+            // 'Prop' property binds with a ctor arg called 'Prop'.
+
+            object newObj = JsonSerializer.Deserialize("{}", objType);
+            Assert.Equal(0, objType.GetProperty("Prop").GetValue(newObj));
+
+            newObj = JsonSerializer.Deserialize(@"{""Prop"":5}", objType);
+            Assert.Equal(5, objType.GetProperty("Prop").GetValue(newObj));
+        }
+
+        [Fact]
+        public void AnonymousObject_NamingPolicy()
+        {
+            const string Json = @"{""prop"":5}";
+
+            var obj = new { Prop = 5 };
+            Type objType = obj.GetType();
+
+            // 'Prop' property binds with a ctor arg called 'Prop'.
+
+            object newObj = JsonSerializer.Deserialize(Json, objType);
+            // Verify no match if no naming policy
+            Assert.Equal(0, objType.GetProperty("Prop").GetValue(newObj));
+
+            var options = new JsonSerializerOptions
+            {
+                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+            };
+
+            newObj = JsonSerializer.Deserialize(Json, objType, options);
+            // Verify match with naming policy
+            Assert.Equal(5, objType.GetProperty("Prop").GetValue(newObj));
+        }
+
+        private record MyRecord(int Prop);
+
+        [Fact]
+        public void Record()
+        {
+            // 'Prop' property binds with a ctor arg called 'Prop'.
+            MyRecord obj = JsonSerializer.Deserialize<MyRecord>("{}");
+            Assert.Equal(0, obj.Prop);
+
+            obj = JsonSerializer.Deserialize<MyRecord>(@"{""Prop"":5}");
+            Assert.Equal(5, obj.Prop);
+        }
+
+        private record AgeRecord(int age)
+        {
+            public string Age { get; set; } = age.ToString();
+        }
+
+        [Fact]
+        public void RecordWithSamePropertyNameDifferentTypes()
+        {
+            AgeRecord obj = JsonSerializer.Deserialize<AgeRecord>(@"{""age"":1}");
+            Assert.Equal(1, obj.age);
+        }
+
+        private record MyRecordWithUnboundCtorProperty(int IntProp1, int IntProp2)
+        {
+            public string StringProp { get; set; }
+        }
+
+        [Fact]
+        public void RecordWithAdditionalProperty()
+        {
+            MyRecordWithUnboundCtorProperty obj = JsonSerializer.Deserialize<MyRecordWithUnboundCtorProperty>(
+                @"{""IntProp1"":1,""IntProp2"":2,""StringProp"":""hello""}");
+
+            Assert.Equal(1, obj.IntProp1);
+            Assert.Equal(2, obj.IntProp2);
+
+            // StringProp is not bound to any constructor property.
+            Assert.Equal("hello", obj.StringProp);
+        }
+
+        [Fact]
+        public void Record_NamingPolicy()
+        {
+            const string Json = @"{""prop"":5}";
+
+            // 'Prop' property binds with a ctor arg called 'Prop'.
+
+            // Verify no match if no naming policy
+            MyRecord obj = JsonSerializer.Deserialize<MyRecord>(Json);
+            Assert.Equal(0, obj.Prop);
+
+            var options = new JsonSerializerOptions
+            {
+                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+            };
+
+            // Verify match with naming policy
+            obj = JsonSerializer.Deserialize<MyRecord>(Json, options);
+            Assert.Equal(5, obj.Prop);
+        }
+
+        private class AgePoco
+        {
+            public AgePoco(int age)
+            {
+                this.age = age;
+            }
+
+            public int age { get; set; }
+            public string Age { get; set; }
+        }
+
+        [Fact]
+        public void PocoWithSamePropertyNameDifferentTypes()
+        {
+            AgePoco obj = JsonSerializer.Deserialize<AgePoco>(@"{""age"":1}");
+            Assert.Equal(1, obj.age);
+        }
     }
 }
diff --git a/src/libraries/System.Text.Json/tests/Serialization/IsExternalInit.cs b/src/libraries/System.Text.Json/tests/Serialization/IsExternalInit.cs
new file mode 100644
index 00000000000000..d789ecb6e2a185
--- /dev/null
+++ b/src/libraries/System.Text.Json/tests/Serialization/IsExternalInit.cs
@@ -0,0 +1,10 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Runtime.CompilerServices
+{
+    /// <summary>
+    /// Dummy class so C# 'Record' types can compile on NetStandard and NetFx.
+    /// </summary>
+    public sealed class IsExternalInit { }
+}
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests.csproj b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests.csproj
index 7701738f903180..72f5dbc5097b3f 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests.csproj
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests.csproj
@@ -142,6 +142,9 @@
   <ItemGroup>
     <Compile Include="..\src\System\Text\Json\BitStack.cs" Link="BitStack.cs" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' != '$(NetCoreAppCurrent)'">
+    <Compile Include="Serialization\IsExternalInit.cs" />
+  </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == '$(NetFrameworkCurrent)'">
     <Compile Include="$(CommonPath)System\Buffers\ArrayBufferWriter.cs" Link="CommonTest\System\Buffers\ArrayBufferWriter.cs" />
   </ItemGroup>