def test_mul_5(self): self.assertEqual(bunsu.mul((1, 5, 3, 7), (1, 0, 0, 1)), (1, 0, 0, 1))
def test_mul_4(self): self.assertEqual(bunsu.mul((-1, 3, 1, 2), (-1, 1, 1, 4)), (1, 4, 3, 8))