我正在 Exercism 網(wǎng)站上進(jìn)行一項(xiàng)練習(xí)，并且我已經(jīng)編寫了程序，但它沒(méi)有通過(guò) Exercism 對(duì)其進(jìn)行的一項(xiàng)測(cè)試。不過(guò)，我不太清楚我需要做什么來(lái)修復(fù)它。這是我的代碼：import randomABILITIES = ['strength', 'dexterity', 'constitution',             'intelligence', 'wisdom', 'charisma']class Character:    def __init__(self):        for ability in ABILITIES:            setattr(self, ability, roll_ability())        self.hitpoints = 10 + modifier(self.constitution)def modifier(constitution):    return (constitution - 10) // 2def roll_ability(dice=4, sides=6):    rolls = []    for die in range(dice):        rolls.append(random.randint(1, sides))    rolls.remove(min(rolls))    return sum(rolls)這是測(cè)試文件中失敗的代碼：def test_random_ability_is_within_range(self):        score = Character().ability()        self.assertIs(score >= 3 and score <= 18, True)這是失敗消息：________________________________ DndCharacterTest.test_random_ability_is_within_range _________________________________self = <dnd_character_test.DndCharacterTest testMethod=test_random_ability_is_within_range>    def test_random_ability_is_within_range(self):>       score = Character().ability()E       AttributeError: 'Character' object has no attribute 'ability'dnd_character_test.py:58: AttributeError我想我需要一個(gè)名為“能力”的對(duì)象屬性？但它有什么作用？我不喜歡必須如此專門地編寫程序才能通過(guò)單元測(cè)試！我想我需要在開始編寫代碼之前通讀單元測(cè)試，這樣我才能知道該怎么做？