public async void AddBookRoute_Test()
        {
            // Arrange
            var newBook = CreateBook();

            SetupMockBookRepo(newBook);

            var bookController = new BookController(_bookRepository.Object, _genreRepository.Object, _mapper);

            // Act
            var result = await bookController.AddUpdateBookAsync(newBook);

            var okResult = result as OkResult;

            // Assert
            Assert.True(okResult != null);
            Assert.Equal(200, okResult.StatusCode);
        }