public async void AddBookReturnsFase()
{
//Arrange
var mockService = new Mock <IBookService>();
var mockMerdiatR = new Mock <IMediator>();
_bookController = new BookController(mockService.Object, mockMerdiatR.Object);
_bookController.ModelState.AddModelError("Name", "Required");
Book newBook = new Book();
//Act
var isBookAdded = await _bookController.AddNewBook(newBook);
//Assert
Assert.Equal(false, isBookAdded.Value);
}