Add NewtonSoft.Json and red round-tip test

Author: richardbuckle

ICSharpCode.AvalonEdit.Tests/Highlighting/DeserializationTests.cs

@@ -0,0 +1,32 @@
+using ICSharpCode.AvalonEdit.Document;
+using ICSharpCode.AvalonEdit.Highlighting;
+using Newtonsoft.Json;
+using NUnit.Framework;
+
+
+namespace ICSharpCode.AvalonEdit.Tests.Highlighting
+{
+	[TestFixture]
+	public class DeserializationTests
+	{
+		TextDocument document;
+		DocumentHighlighter highlighter;
+
+		[SetUp]
+		public void SetUp()
+		{
+			document = new TextDocument("using System.Text;\n\tstring text = SomeMethod();");
+			highlighter = new DocumentHighlighter(document, HighlightingManager.Instance.GetDefinition("C#"));
+		}
+
+		[Test]
+		public void TestRoundTripColor()
+		{
+			HighlightingColor color = highlighter.GetNamedColor("Comment");
+			string jsonString = JsonConvert.SerializeObject(color);
+
+			HighlightingColor color2 = JsonConvert.DeserializeObject<HighlightingColor>(jsonString);
+			Assert.AreEqual(color, color2);
+		}
+	}
+}

ICSharpCode.AvalonEdit.Tests/ICSharpCode.AvalonEdit.Tests.csproj

@@ -22,6 +22,7 @@
     <DefineConstants>TRACE</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="NUnit" Version="3.11.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
   </ItemGroup>