Test deserializing sorted set subclass (#1852)

Src/Newtonsoft.Json.Tests/Issues/Issue1796.cs

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+#region License
+// Copyright (c) 2007 James Newton-King
+//
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+#endregion
+
+#if !(NET20 || NET35)
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using System.Reflection.Emit;
+using System.Runtime.Serialization;
+#if !(NET20 || NET35 || NET40 || PORTABLE40)
+using System.Threading.Tasks;
+#endif
+using Newtonsoft.Json.Converters;
+using Newtonsoft.Json.Linq;
+using Newtonsoft.Json.Serialization;
+using Newtonsoft.Json.Utilities;
+#if DNXCORE50
+using Xunit;
+using Test = Xunit.FactAttribute;
+using Assert = Newtonsoft.Json.Tests.XUnitAssert;
+#else
+using NUnit.Framework;
+#endif
+
+namespace Newtonsoft.Json.Tests.Issues
+{
+    [TestFixture]
+    public class Issue1796 : TestFixtureBase
+    {
+        [Test]
+        public void Test()
+        {
+            string json = "[{}]";
+            TestStack c = JsonConvert.DeserializeObject<TestStack>(json);
+            Assert.AreEqual(1, c.Count);
+        }
+
+        [Test]
+        public void Test_Generic()
+        {
+            string json = "['hi']";
+            TestStack<string> c = JsonConvert.DeserializeObject<TestStack<string>>(json);
+            Assert.AreEqual(1, c.Count);
+        }
+
+        public class TestStack : SortedSet<object>
+        {
+        }
+
+        public class TestStack<T> : SortedSet<T>
+        {
+        }
+    }
+}
+#endif