public void NullValueThrowsArgumentNullException()
{
CardNumberValidator.IsValid(null);
}
public void EmptyValueIsInvalid()
{
Assert.IsFalse(CardNumberValidator.IsValid(""), "Null value must not be valid");
}
private static void AssertIsInvalid(string cardNumber)
{
string errorMessage = string.Format("Card number '{0}' must be invalid!", cardNumber);
Assert.IsFalse(CardNumberValidator.IsValid(cardNumber.Replace(" ", "")), errorMessage);
}
