def test_negative_power(self): self.assertEqual(power(5, -6), pow(5, -6))
def test_input_integer_or_float(self): self.assertEqual(power('u', 8), 'invalid input')
def test_both_negative(self): self.assertEqual(power(-5, -5), pow(-5, -5))
def test_float_power(self): self.assertEqual(power(-5.0, 5.3), 'invalid input')
def test_power(self): self.assertEqual(power(2, 1), pow(2, 1))