chore: add MetadataJsonConfig JSON roundtrip test

Author: filzrev

src/Docfx.Common/Json/JsonUtility.cs

@@ -91,6 +91,7 @@ private static bool IsSupported()
             {
                 // TODO: Return `true` for types that support serialize/deserializenon with System.Text.Json.
                 case "Docfx.BuildJsonConfig":
+                case "Docfx.MetadataJsonConfig":
                 case "Docfx.MergeJsonConfig":
 
                 case "Docfx.Build.Engine.XRefMap":

src/Docfx.Dotnet/MetadataJsonConfig.cs

@@ -272,6 +272,9 @@ internal class MetadataJsonItemConfig
 /// </summary>
 internal class MetadataJsonConfig : List<MetadataJsonItemConfig>
 {
+    // Constructor that required for System.Text.Json deserialization.
+    public MetadataJsonConfig() { }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="MetadataJsonConfig"/> class.
     /// </summary>

test/docfx.Tests/SerializationTests/JsonSerializationTest.MetadataJsonConfig.cs

@@ -0,0 +1,22 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Docfx;
+using Docfx.Common;
+using FluentAssertions;
+
+namespace docfx.Tests;
+
+public partial class JsonSerializationTest
+{
+    [Theory]
+    [TestData<MetadataJsonConfig>]
+    public void JsonSerializationTest_MetadataJsonConfig(string path)
+    {
+        // Arrange
+        var model = TestData.Load<MetadataJsonConfig>(path);
+
+        // Act/Assert
+        ValidateJsonRoundTrip(model);
+    }
+}

test/docfx.Tests/SerializationTests/TestData/MetadataJsonConfig/metadataJsonConfig_01.json

@@ -0,0 +1,42 @@
+[
+  {
+    "src": [
+      {
+        "files": [
+          "assembly/bin/**/*.dll",
+          "project/**/*.csproj",
+          "solution/**/*.sln",
+          "csharp/**/*.cs",
+          "vb/**/*.vb"
+        ],
+        "exclude": [
+          "project/Project.Core/**"
+        ],
+        "src": "dotnet"
+      }
+    ],
+    "output": "obj/api",
+    "outputFormat": "apiPage",
+    "shouldSkipMarkup": false,
+    "references": [
+      "refs/dummy.dll"
+    ],
+    "filter": "filterConfig.yml",
+    "includePrivateMembers": true,
+    "includeExplicitInterfaceImplementations": true,
+    "globalNamespaceId": "Global",
+    "properties": {
+      "DefineConstants": "dummy1, dummy2",
+      "TargetFrameworks": "dummy"
+    },
+    "disableGitFeatures": false,
+    "codeSourceBasePath": "dummy",
+    "disableDefaultFilter": true,
+    "noRestore": true,
+    "categoryLayout": "nested",
+    "namespaceLayout": "nested",
+    "memberLayout": "separatePages",
+    "enumSortOrder": "declaringOrder",
+    "allowCompilationErrors": true
+  }
+]

test/docfx.Tests/SerializationTests/TestData/MetadataJsonConfig/metadataJsonConfig_02.json

@@ -0,0 +1,64 @@
+[
+  {
+    "src": [
+      {
+        "files": [
+          "assembly/bin/**/*.dll",
+          "project/**/*.csproj",
+          "solution/**/*.sln",
+          "csharp/**/*.cs",
+          "vb/**/*.vb"
+        ],
+        "exclude": [
+          "project/Project.Core/**"
+        ],
+        "src": "dotnet"
+      }
+    ],
+    "namespaceLayout": "nested",
+    "enumSortOrder": "declaringOrder",
+    "output": "obj/api"
+  },
+  {
+    "src": [
+      {
+        "files": [
+          "assembly/bin/**/*.dll",
+          "project/**/*.csproj",
+          "solution/**/*.sln",
+          "csharp/**/*.cs",
+          "vb/**/*.vb"
+        ],
+        "exclude": [
+          "project/Project.Core/**"
+        ],
+        "src": "dotnet"
+      }
+    ],
+    "namespaceLayout": "nested",
+    "enumSortOrder": "declaringOrder",
+    "outputFormat": "markdown",
+    "output": "obj/md"
+  },
+  {
+    "src": [
+      {
+        "files": [
+          "assembly/bin/**/*.dll",
+          "project/**/*.csproj",
+          "solution/**/*.sln",
+          "csharp/**/*.cs",
+          "vb/**/*.vb"
+        ],
+        "exclude": [
+          "project/Project.Core/**"
+        ],
+        "src": "dotnet"
+      }
+    ],
+    "namespaceLayout": "nested",
+    "enumSortOrder": "declaringOrder",
+    "outputFormat": "apiPage",
+    "output": "obj/apipage"
+  }
+]