def test_mul_many_numbers():
    s = range(1, 10)

    assert Calc.mul(*s) == 362880
def test_mul_by_zero_raises_exception():
    c = Calc()

    with pytest.raises(ValueError):
        c.mul(3, 0)
def test_mul_two_numbers():
    c = Calc()

    res = c.mul(6, 4)

    assert res == 24