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"]);
}