public async Task DeleteAllConfirmed_Post_RedirectToIndex()
        {
            Mock <BusinessTripService> mock       = new Mock <BusinessTripService>();
            BusinessTripController     controller = GetNewBusinessTripController(mock.Object, null);

            RedirectToRouteResult result = (await controller.DeleteAllConfirmed()) as RedirectToRouteResult;

            Assert.AreEqual("Index", result.RouteValues["action"]);
        }