MSTest Assert Utility for MVC3 Controller Unit Testing

AssertMvc.cs

    using System.Web.Mvc;
    using Microsoft.VisualStudio.TestTools.UnitTesting;

    /// <summary>
    /// MSTest Asserts for unit testing MVC3 Controllers.
    /// </summary>
    public static class AssertMvc
    {
        public static T ResultIs<T>(object result)
            where T : ActionResult
        {
            Assert.IsInstanceOfType(result, typeof(T));
            return result as T;
        }

        public static ViewResult View(string expectedViewName, ActionResult result)
        {
            var viewResult = ResultIs<ViewResult>(result);
            Assert.AreEqual(expectedViewName, viewResult.ViewName);
            return viewResult;
        }

        public static ViewResult DefaultView(ActionResult result)
        {
            var viewResult = ResultIs<ViewResult>(result);
            Assert.IsTrue(string.IsNullOrEmpty(viewResult.ViewName));
            Assert.IsNull(viewResult.View);
            return viewResult;
        }

        public static PartialViewResult DefaultPartialView(ActionResult result)
        {
            var viewResult = ResultIs<PartialViewResult>(result);
            Assert.IsTrue(string.IsNullOrEmpty(viewResult.ViewName));
            Assert.IsNull(viewResult.View);
            return viewResult;
        }

        public static ViewResult DefaultViewOr(string expectedViewName, ActionResult result)
        {
            var viewResult = ResultIs<ViewResult>(result);
            Assert.IsTrue(string.IsNullOrEmpty(viewResult.ViewName) || viewResult.ViewName == expectedViewName);
            return viewResult;
        }

        public static void ModelIsNull(ActionResult result)
        {
            var viewResult = ResultIs<ViewResultBase>(result);
            Assert.IsNull(viewResult.Model);
        }

        public static T ModelIsInstanceOfType<T>(ActionResult result)
        {
            var viewResult = ResultIs<ViewResultBase>(result);
            Assert.IsInstanceOfType(viewResult.Model, typeof(T));
            return (T)viewResult.Model;
        }

        public static void RedirectsToAction(string expectedAction, ActionResult result)
        {
            var redirectResult = ResultIs<RedirectToRouteResult>(result);
            Assert.AreEqual(expectedAction, redirectResult.RouteValues["action"]);
        }

        public static void RedirectsToAction(string expectedAction, string expectedController, ActionResult result)
        {
            var redirectResult = ResultIs<RedirectToRouteResult>(result);
            Assert.AreEqual(expectedController, redirectResult.RouteValues["controller"]);
            Assert.AreEqual(expectedAction, redirectResult.RouteValues["action"]);
        }

        public static void RedirectsTo(string expectedUrl, ActionResult result)
        {
            var redirectResult = ResultIs<RedirectResult>(result);
            Assert.AreEqual(expectedUrl, redirectResult.Url);
        }
    }

Sample Usage:

    [TestMethod]
    public void GetLogOn_ReturnsDefaultViewAndModel()
    {
        var controller = new LogOnController();
        var result = controller.LogOn();

        AssertMvc.DefaultView(result);
        AssertMvc.ModelIsInstanceOfType<LogOnModel>(result);
    }