I am attempting to create integration tests to make sure my views do not have any runtime errors in them. Thus I need to create a test that checks if `ViewResult.ExecuteResult()` works correctly but it seems I have hit a snag. 

I found [this site](http://www.heartysoft.com/post/2010/05/25/ASPNET-MVC-Unit-Testing-JsonResult-Returning-Anonymous-Types.aspx) which gave me a starting point, and I have the following code:

```
    [TestMethod]
    public void RegisterResultExecutes()
    {
        //arrange 
        RequestContext requestContext = new RequestContext(new MockHttpContext(), new RouteData());
        AccountController controller = new AccountController
        {
            FormsService = new MockFormsAuthenticationService(),
            MembershipService = new MockMembershipService(),
            Url = new UrlHelper(requestContext)
        };

        var result = controller.Register();
        var sb = new StringBuilder();
        Mock<HttpResponseBase> response = new Mock<HttpResponseBase>();
        response.Setup(x => x.Write(It.IsAny<string>())).Callback<string>(y =>
        {
            sb.Append(y);
        });
        Mock<ControllerContext> controllerContext = new Mock<ControllerContext>();
        controllerContext.Setup(x => x.HttpContext.Response).Returns(response.Object);

        //act 
        result.ExecuteResult(controllerContext.Object);
    }

```

The problem is that when `result.ExecuteResult()` is called I get the following exception

```
System.NullReferenceException: Object reference not set to an instance of an object.

System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
MyApp.Tests.Controllers.AccountControllerTest.RegisterResultExecutes() in C:\Users\KallDrexx\Documents\Projects\MyApp\MyApp.Tests\Controllers\AccountControllerTests.cs: line 297

```

Unfortunately, that stack trace isn't very useful as I'm not sure what it's trying to access that is null. Does anyone have any suggestions on how I can create a test for `ExecuteResult()`?