public void testAddAllowedCardType() { CreditCardValidator ccv = new CreditCardValidator(CreditCardValidator.NONE); // Turned off all cards so even valid numbers should fail assertFalse(ccv.isValid(VALID_VISA)); assertFalse(ccv.isValid(VALID_AMEX)); assertFalse(ccv.isValid(VALID_MASTERCARD)); assertFalse(ccv.isValid(VALID_DISCOVER)); // test our custom type ccv.addAllowedCardType(new DinersClub()); assertTrue(ccv.isValid(VALID_DINERS)); }