def test_cal_mul_0_0_get_0(self):
     result = calrand.multiply(0, 0)
     expected = 0
     self.assertEqual(expected, result)
 def test_cal_mul_n100_n200_get_20000(self):
     result = calrand.multiply(-100, -200)
     expected = 20000
     self.assertEqual(expected, result)