public async Task Given_A_Card_Id_Should_Invoke_CardById_Method_Once()
{
// Arrange
const long cardId = 4322;
_cardRepository.CardById(Arg.Any <long>()).Returns(new Card());
// Act
await _sut.CardById(cardId);
// Assert
await _cardRepository.Received(1).CardById(Arg.Is(cardId));
}