import re import unittest def validate_credit_card_number(cc): return bool(re.match('^\d{16}$', cc)) class TestIsValidCreditCardNumber(unittest.TestCase): def test_fails_when_only_14_digits(self): self.assertFalse( validate_credit_card_number('01234567890123') ) def test_fails_when_more_than_16_digits(self): self.assertFalse( validate_credit_card_number('0123456783454390123') ) def test_fails_its_non_numeric(self): self.assertFalse( validate_credit_card_number('fiuef398rq8hdoqa') ) def test_passes_when_its_exactly_16_numerical_digits(self): self.assertTrue( validate_credit_card_number('1234567812345678') ) if __name__ == '__main__': unittest.main()
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