public void EditTest_Get_ReturnErrorViewWhenIdIsZero() { _placesService.Setup(s => s.GetById(0)) .Throws <NullReferenceException>(); var result = _placesController.Edit(0); var viewResult = Assert.IsType <ViewResult>(result); var model = Assert.IsAssignableFrom <ErrorViewModel>(viewResult.ViewData.Model); Assert.Equal("The place that you are looking for doesn`t exist.", model.ErrorMessage); }