def test_none_when_get_nominator_denominator_invalid(self): result = Fraction.get_nominator_denominator('a') self.assertIsNone(result)
def test_can_get_nominator_denominator_minus_1_2(self): p, q = Fraction.get_nominator_denominator('-1/2') result = p == '-1' and q == '2' self.assertTrue(result)