def test_cal_div_0_0_get_error(self):
result = calrand.divide(0, 0)
expected = 'divide by zero exception'
self.assertEqual(expected, result)
def test_cal_div_n100_200_get_nf0p5(self):
result = calrand.divide(-100, 200)
expected = -0.5
self.assertEqual(expected, result)
def test_cal_div_0_200_get_0(self):
result = calrand.divide(0, 200)
expected = 0
self.assertEqual(expected, result)