public void BorrowBookAction_BookBALIsCalled()
{
// Arrange
var bookBALMoq = new Mock <IBookService>();
bookBALMoq.Setup(x => x.BorrowBook(It.IsAny <int>(), fakeUser.Id)).Returns(() => true);
BooksController bookController = CreateControllerWithFakeUser(bookBALMoq.Object);
// Act
var result = bookController.BorrowBook(1) as RedirectToRouteResult;
// Assert
bookBALMoq.Verify(x => x.BorrowBook(It.IsAny <int>(), fakeUser.Id), Times.Once);
Assert.IsTrue(result != null);
}