Fix Result by allowing "duration" to be nullable

* "duration" property was always populated otherwise with 0 duration
* Add basic tests for serialization/deserialization

Author: brianjmiller

TinCan/Result.cs

@@ -25,7 +25,7 @@ public class Result : JsonModel
         public Nullable<Boolean> completion { get; set; }
         public Nullable<Boolean> success { get; set; }
         public String response { get; set; }
-        public TimeSpan duration { get; set; }
+        public Nullable<TimeSpan> duration { get; set; }
         public Score score { get; set; }
         public Extensions extensions { get; set; }
 
@@ -78,7 +78,7 @@ public override JObject ToJObject(TCAPIVersion version) {
             }
             if (duration != null)
             {
-                result.Add("duration", XmlConvert.ToString(duration));
+                result.Add("duration", XmlConvert.ToString((TimeSpan)duration));
             }
             if (score != null)
             {

TinCanTests/ResultTest.cs

@@ -0,0 +1,70 @@
+/*
+    Copyright 2015 Rustici Software
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+namespace TinCanTests
+{
+    using System;
+    using NUnit.Framework;
+    using Newtonsoft.Json.Linq;
+    using TinCan;
+    using TinCan.Json;
+
+    [TestFixture]
+    class ResultTest
+    {
+        [Test]
+        public void TestEmptyCtr()
+        {
+            var obj = new Result();
+            Assert.IsInstanceOf<Result>(obj);
+            Assert.IsNull(obj.completion);
+            Assert.IsNull(obj.success);
+            Assert.IsNull(obj.response);
+            Assert.IsNull(obj.duration);
+            Assert.IsNull(obj.score);
+            Assert.IsNull(obj.extensions);
+
+            StringAssert.AreEqualIgnoringCase("{}", obj.ToJSON());
+        }
+
+        [Test]
+        public void TestJObjectCtr()
+        {
+            var cfg = new JObject();
+            cfg.Add("completion", true);
+            cfg.Add("success", true);
+            cfg.Add("response", "Yes");
+
+            var obj = new Result(cfg);
+            Assert.IsInstanceOf<Result>(obj);
+            Assert.That(obj.completion, Is.EqualTo(true));
+            Assert.That(obj.success, Is.EqualTo(true));
+            Assert.That(obj.response, Is.EqualTo("Yes"));
+        }
+
+        [Test]
+        public void TestStringOfJSONCtr()
+        {
+            var json = "{\"success\": true, \"completion\": true, \"response\": \"Yes\"}";
+            var strOfJson = new StringOfJSON(json);
+
+            var obj = new Result(strOfJson);
+            Assert.IsInstanceOf<Result>(obj);
+            Assert.That(obj.success, Is.EqualTo(true));
+            Assert.That(obj.completion, Is.EqualTo(true));
+            Assert.That(obj.response, Is.EqualTo("Yes"));
+        }
+    }
+}

TinCanTests/TinCanTests.csproj

@@ -71,6 +71,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="AgentTest.cs" />
+    <Compile Include="ResultTest.cs" />
     <Compile Include="Support.cs" />
     <Compile Include="SubStatementTest.cs" />
     <Compile Include="StatementTest.cs" />