How do I Unit Test a MVC redirection?

    public ActionResult Create(Product product)
    {

        _productTask.Save(product);

        return RedirectToAction("Success");

    }

    public ActionResult Success()
    {

        return View();
    }

Is Ayende's approach still the best way to go, with preview 5:

 public static void RenderView(this Controller self, string action) 
 {
    typeof(Controller).GetMethod("RenderView").Invoke(self,new object[] { action} ); 
 }

Seems odd to have to do this, especially as the MVC team have said they are writing the framework to be testable.