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>));
        }