Added JsonResult Assertions

src/FluentAssertions.Mvc.Shared/ActionResultAssertions.cs

@@ -209,5 +209,34 @@ public ViewResultAssertions BeViewResult(string reason, params object[] reasonAr
 
 			return new ViewResultAssertions (Subject as ViewResult);
 		}
+
+	    /// <summary>
+	    /// Asserts that the subject is a <see cref="JsonResult"/>.
+	    /// </summary>
+	    public JsonResultAssertions BeJsonResult()
+	    {
+	        return BeJsonResult(string.Empty, null);
+	    }
+
+	    /// <summary>
+	    /// Asserts that the subject is a <see cref="JsonResult"/>.
+	    /// </summary>
+	    /// <param name="reason">
+	    /// A formatted phrase as is supported by <see cref="string.Format(string,object[])" /> explaining why the assertion 
+	    /// is needed. If the phrase does not start with the word <i>because</i>, it is prepended automatically.
+	    /// </param>
+	    /// <param name="reasonArgs">
+	    /// Zero or more objects to format using the placeholders in <paramref name="reason"/>.
+	    /// </param>
+	    public JsonResultAssertions BeJsonResult(string reason, params object[] reasonArgs)
+	    {
+	        Execute.Assertion
+	            .BecauseOf(reason, reasonArgs)
+	            .ForCondition(Subject is JsonResult)
+	            .FailWith(Constants.CommonFailMessage, typeof(JsonResult).Name, Subject.GetType().Name);
+
+	        return new JsonResultAssertions(Subject as JsonResult);
+	    }
+
 	}
 }

src/FluentAssertions.Mvc.Shared/FailureMessages.resx

@@ -120,6 +120,9 @@
   <data name="CommonFailMessage" xml:space="preserve">
     <value>Expected {0} to be '{1}' but found '{2}'</value>
   </data>
+  <data name="JsonResult_WithDataPredicate" xml:space="preserve">
+    <value>Expected {0} to match the predicate test, but '{1}' did not</value>
+  </data>
   <data name="RouteData_DataTokens_ContainsKey" xml:space="preserve">
     <value>RouteData.DataTokens does not contain key {0}.</value>
   </data>

src/FluentAssertions.Mvc.Shared/FluentAssertions.Mvc.Shared.projitems

@@ -22,6 +22,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Fakes\FakeHttpContext.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Fakes\FakeHttpRequest.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Fakes\FakeHttpResponse.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)JsonResultAssertions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)PartialViewResultAssertions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)RedirectResultAssertions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)RedirectToRouteAssertions.cs" />