Write $parent value for property that is parent (#973)

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;CS0649;xUnit1026;xUnit1013;msb3277;CS0436;CS1573;NU1901;NU1902</NoWarn>
-    <Version>20.8.1</Version>
+    <Version>20.8.2</Version>
     <ImplicitUsings>enable</ImplicitUsings>
     <LangVersion>11</LangVersion>
     <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>

src/StrictJsonTests/SerializationTests.WithRecursiveConverter.verified.json

@@ -0,0 +1,3 @@
+{
+  "SelfProperty": "$parentValue"
+}

src/Verify.Tests/Serialization/SerializationTests.WithRecursiveConverter.verified.txt

@@ -0,0 +1,3 @@
+{
+  SelfProperty: $parentValue
+}

src/Verify.Tests/Serialization/SerializationTests.cs

@@ -3319,6 +3319,27 @@ class ConverterTarget
         public string Name { get; set; } = null!;
     }
 
+    [Fact]
+    public Task WithRecursiveConverter() =>
+        Verify(new RecursiveConverterTarget())
+            .AddExtraSettings(_ => _.Converters.Add(new RecursiveConverter()));
+
+    class RecursiveConverter :
+        WriteOnlyJsonConverter<RecursiveConverterTarget>
+    {
+        public override void Write(VerifyJsonWriter writer, RecursiveConverterTarget target)
+        {
+            writer.WriteStartObject();
+            writer.WriteMember(target, target.Self, "SelfProperty");
+            writer.WriteEnd();
+        }
+    }
+
+    class RecursiveConverterTarget
+    {
+        public RecursiveConverterTarget Self => this;
+    }
+
     [ModuleInitializer]
     public static void WithConverterAndMemberConverterInit() =>
         VerifierSettings.MemberConverter<StaticConverterTarget, string>(

src/Verify/Serialization/VerifyJsonWriter.cs

@@ -148,6 +148,13 @@ public void WriteMember(object target, object? value, string name)
             return;
         }
 
+        if (ReferenceEquals(target, value))
+        {
+            WritePropertyName(name);
+            WriteRawValueIfNoStrict("$parentValue");
+            return;
+        }
+
         var declaringType = target.GetType();
         var memberType = value.GetType();
         if (serialization.TryGetScrubOrIgnore(declaringType, memberType, name, out var scrubOrIgnore))