-Added additional frameworks to project.json files

Src/Newtonsoft.Json.Tests/Documentation/Samples/Serializer/SerializeImmutableCollections.cs

@@ -23,15 +23,22 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 #endregion
 
+#if !(NET20 || NET35 || NET40)
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+#if DNXCORE50
+using Xunit;
+using Test = Xunit.FactAttribute;
+using Assert = Newtonsoft.Json.Tests.XUnitAssert;
+#else
 using NUnit.Framework;
+#endif
 using System.Runtime.Serialization;
 using Newtonsoft.Json.Linq;
 using Newtonsoft.Json.Serialization;
-using Autofac;
 using Newtonsoft.Json.Tests.Serialization;
 using System.Collections.Immutable;
 
@@ -66,4 +73,6 @@ namespace Newtonsoft.Json.Tests.Documentation.Samples.Serializer
 ]", json);
         }
     }
-}
+}
+
+#endif