def test_multiply_ten_numbers():
c = Calc()
s = range(1, 10)
res = c.mul(*s)
assert res == 362880
def test_mul_by_zero_raises_exception():
c = Calc()
with pytest.raises(ValueError):
c.mul(9, 0)
def test_multiply_three_numbers():
c = Calc()
res = c.mul(3, 5, 4)
assert res == 60
def test_multiply_two_numbers():
c = Calc()
res = c.mul(5, 3)
assert res == 15