public void ShouldFailToAddReturnUrl()
        {
            // arrange
            RouteValueDictionary actual = new RouteValueDictionary();

            // act

            // assert
            Assert.AreEqual(0, actual.AddReturnUrl("").Count);
        }
        public void ShouldAddReturnUrl()
        {
            // arrange
            RouteValueDictionary expected = new RouteValueDictionary(new {
                returnUrl = "returnHere"
            });
            RouteValueDictionary actual = new RouteValueDictionary();

            // act

            // assert
            RoutingAssert.AreDictionariesEqual(expected, actual.AddReturnUrl("returnHere"));
        }