public void DeleteReturnsOkNegotiatedContentResultDTO() { // Arrange var mockRepository = new Mock <IRepository <ToDoItem> >(); mockRepository.SetReturnsDefault(new ToDoItem() { Id = 10 }); var controller = new ToDoItemsController(mockRepository.Object, _mapper); // Act IHttpActionResult actionResult = controller.Delete(10); // Assert Assert.IsInstanceOfType(actionResult, typeof(OkNegotiatedContentResult <ToDoItemDTO>)); }