def test_mul_many_numbers():
    c = Calc()
    many = range(1, 6)

    assert c.mul(*many) == 120
def test_mul_by_0_raises_exception():
    c = Calc()

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

    assert c.mul(3, 10) == 30