Problem with TempData and Faked HttpContext using ASP.NET MVC

I am working with a faked HttpContext (code provided in the end) and probably I am missing something because I can't access TempData collection (forth line of SetFakeControllerContext method). Every time I try I get this error message:

'controller.TempData' threw an exception of type 'System.AccessViolationException'

The code that calls FakeHttpContext is:

    public static void SetFakeControllerContext(this Controller controller)
    {
        HttpContextBase httpContext = FakeHttpContext(string.Empty);
        var context = new ControllerContext(new RequestContext(httpContext, new RouteData()), controller);
        controller.ControllerContext = context;
        controller.TempData = new TempDataDictionary(); //This is not necessary! It was just a test!!!!
    }

Does anybody know what I am doing wrong?

public static HttpContextBase FakeHttpContext(string username){

var context = new Mock<HttpContextBase>();
var request = new Mock<HttpRequestBase>();
var response = new Mock<HttpResponseBase>();
var session = new Mock<HttpSessionStateBase>();
var server = new Mock<HttpServerUtilityBase>();
var user = new Mock<IPrincipal>();
var identity = new Mock<IIdentity>();

context.Setup(ctx => ctx.Request).Returns(request.Object);
context.Setup(ctx => ctx.Response).Returns(response.Object);
context.Setup(ctx => ctx.Session).Returns(session.Object);
context.Setup(ctx => ctx.Server).Returns(server.Object);
context.Setup(ctx => ctx.User).Returns(user.Object);

user.Setup(ctx => ctx.Identity).Returns(identity.Object);

if (!string.IsNullOrEmpty(username))
{
    identity.Setup(id => id.IsAuthenticated).Returns(true);
    identity.Setup(id => id.Name).Returns(username);
}
else
{
    identity.Setup(id => id.IsAuthenticated).Returns(false);
    identity.Setup(id => id.Name).Returns(string.Empty);
}

context.Setup(ctx => c开发者_如何学Ctx.Response.Cache).Returns(CreateCachePolicy());
return context.Object;

}

P.s.: I am using Moq

UPDATE:

OMG!! I CAN'T BELIEVE IT! More than 2 hours to figure out that the problem was a reference to the wrong MVC dll. I was referencing System.Web.Mvc 2.0 for my main app but System.Web.Mvc 1.0 in another project. Sorry about this!

The problem's definitely somewhere else. You don't even need to initialize the TempData property to a new dictionary in your unit test. The following program works fine:

public class HomeController: Controller
{
    public ActionResult Index()
    {
        TempData["foo"] = "bar";
        return View();
    }
}

class Program
{
    static void Main()
    {
        var controller = new HomeController();
        controller.Index();
        Console.WriteLine(controller.TempData["foo"]);
    }
}