def test_cal_pow_0_n5_get_error(self):
result = calrand.pow(0, -5)
expected = 'math error'
self.assertEqual(expected, result)
def test_cal_pow_n5_2_get_25(self):
result = calrand.pow(-5, 2)
expected = 25
self.assertEqual(expected, result)
def test_cal_pow_n5_n2_get_0p04(self):
result = calrand.pow(-5, -2)
expected = 0.04
self.assertEqual(expected, result)
def test_cal_pow_0_0_get_1(self):
result = calrand.pow(0, 0)
expected = 1
self.assertEqual(expected, result)