def test_charge(self):
card = CreditCard("Mr. Test", "TBank Inc", "20 677 880", 1000)
with self.assertRaises(ValueError):
card.charge("abcd")
def test_make_payment(self):
card = CreditCard("Mr. Test", "TBank Inc", 200, 1000)
with self.assertRaises(ValueError):
card.make_payment("a")
