public void GetBookById_ExistingBook_ReturnsOk()
{
mockService.Setup(s => s.AddBook(It.IsAny <AddBookDto>()))
.Returns(BookTestData.AddBookServiceResponse());
mockService.Setup(s => s.GetBookById(It.IsAny <int>()))
.Returns(BookTestData.GetSingleBookServiceResponse());
BookController bookController = new BookController(mockService.Object);
AddBookDto newBook = BookTestData.AddBookDto();
bookController.AddBook(newBook);
var result = bookController.GetSingleBook(1);
Assert.That(result, Is.InstanceOf <OkObjectResult>());
}
