Testing ASP.net MVC routes does not need to be hard or require external testing libraries. this uses XUnit and Nsubstitue. refactoring out the RequestPath and the assertion and you have a very simple test fixture.

RouteFixture.cs

public class RouteFixture
    {
        private readonly HttpContextBase _httpContextMock;
        private readonly RouteCollection _routes;

        public RouteFixture()
        {
            _routes = new RouteCollection();
            RouteConfig.RegisterRoutes(_routes);

            _httpContextMock = Substitute.For<HttpContextBase>();
        }

        private RouteData RequestPath(string url)
        {
            _httpContextMock.Request.AppRelativeCurrentExecutionFilePath.Returns(url);
            return _routes.GetRouteData(_httpContextMock);
        }


        [Fact]
        public void RouteDefaultsToHomeWhenNoControllerOrActionProvided()
        {
            RequestPath("~/").ShouldMatchRoute("Home", "Index");
        }
        [Fact]
        public void HomeIndexGoesToHomeIndex()
        {
            RequestPath("~/Home/Index").ShouldMatchRoute("Home", "Index");
        }

        
    }

    public static class RouteTestingExtensions
    {
        public static void ShouldMatchRoute(this RouteData routeData, string controllerName, string actionName)
        {
            Assert.NotNull(routeData);
            Assert.Equal(controllerName, routeData.Values["Controller"]);
            Assert.Equal(actionName, routeData.Values["action"]);
        }
    }