public void ThrowsArgumentNullExceptionifValidatorIsNull()
{
ExceptionTester.CallMethodAndExpectException<ArgumentException>(() => Argument.IsValid("myParam", "value", (IValueValidator<string>)null));
ExceptionTester.CallMethodAndExpectException<ArgumentException>(() => Argument.IsValid("myParam", (string)null, (IValueValidator<string>)null));
}