def testValidMastercard(self):
"Ensures `CreditCard.type` returns `'master'` for valid Mastercard numbers."
nums = ['6771890000000000', '5413031000000000']
for num in nums:
self.assertEqual(CreditCard.type(num), 'master')
def testValidVisa(self):
"Ensures `CreditCard.type` returns `'visa'` for valid Visa numbers."
nums = ['4175001000000000',]
for num in nums:
self.assertEqual(CreditCard.type(num), 'visa')
