def test_get_first_negative_floor_empty_string():
    if get_first_negative_floor("") is not None:
        pytest.fail("Empty string should be None")
def test_get_first_negative_floor_dirty():
    """Test against dirty/mixed input"""
    assert get_first_negative_floor("$di(r)t(y))") == 5
def test_get_first_negative_floor():
    assert get_first_negative_floor(")") == 1
    assert get_first_negative_floor("()())") == 5