def METHOD_NAME(self):
    input_true = '$$$$ab&%!'
    input_false = 'normal text!'
    result_true = _add_special_character_ratio_score(input_true, 0)
    result_false = _add_special_character_ratio_score(input_false, 0)
    assert result_true < 0, 'special normal ratio fail'
    assert result_false > 0, 'special to normal ratio fail2'