public async Task Given_A_Card_Name_Should_Invoke_CardByName_Method_Once()
{
// Arrange
const string cardName = "Blue-Eyes White Dragon";
_cardRepository.CardByName(Arg.Any <string>()).Returns(new Card());
// Act
await _sut.CardByName(cardName);
// Assert
await _cardRepository.Received(1).CardByName(Arg.Is(cardName));
}