public void Calculate_The_Correct_Result() { var sut = new LuhnChecksumCalculator(); sut.Calculate("7992739871").Should().Be(3); sut.Calculate("123456789").Should().Be(7); }
public void When_Subject_Is_Null_Throw_ArgumentNullException() { var sut = new LuhnChecksumCalculator(); Action action = () => sut.Calculate(null); action.Should().Throw <ArgumentNullException>(); }