public void should_return_true_in_validate_valid_nationalCode()
        {
            var isValidNationalNumber = NationalNumber.IsValid(NationalNumber.Create());

            Check.That(isValidNationalNumber).IsTrue();
        }
        public void should_return_false_in_validate_invalid_nationalCode(string nationalCode)
        {
            var isValidNationalNumber = NationalNumber.IsValid(nationalCode);

            Check.That(isValidNationalNumber).IsFalse();
        }