Python 行为测试正在下降，但代码可以自行运行。我不知道为什么

Question

我是新手开发者，请谅解
所以我有一个关于游戏“城镇”的代码，您在其中命名一个城镇，下一个城镇应该从上一个城镇的最后一个字符开始。

我为游戏本身编写了代码。它本身似乎可以工作，但在测试过程中出现错误。

def formatCityName( name_city):
    return name_city.strip().lower().capitalize()

class Town_Game:

    def startGame(self,name_city):
        self.cities = set()
        self.cache = set()
        char = None
        if not self.cities:
            self.cities = {formatCityName(x) for x in open("C:/Users/bodmi/PycharmProjects/test3/cities.txt", "r", encoding="utf-8").readlines() if x.strip()}


        try:
            lastChar = self.isCorrectTown(name_city, char)
            return str(lastChar)
        except Exception as e:
            return f"Error processing town: {str(e)}"

    def isCorrectTown(self, name_city, char):
        if (name_city in self.cities) and (name_city[0] == char or char is None) and not (name_city in self.cache):
            return name_city[-1]
        else:
            raise ValueError(f"{name_city} is not a valid city or has already been used.")

print(Town_Game.startGame(Town_Game,"London")) #outputs "n"

特点：

Feature: I want to play a game Towns

    Scenario: When i saying town name
        Given Game starts
        When I saying new town "London"
        Then New town should be added to cache and next town should start from "n"

测试：

from behave import given, when, then
from town_game import Town_Game, formatCityName


@given('Game starts')
def step_given_calculator_running(context):
    context.game = Town_Game()


@when('I saying new town {name_city}')
def step_when_enter_expression(context, name_city):
    context.result = context.game.startGame(name_city)


@then('New town should be added to cache and next town should start from {expected_result}')
def step_then_verify_result(context, expected_result):
    assert context.result == expected_result, \
        f"Expected '{expected_result}', but got '{context.result}'"

当我运行测试时，它说：预期为“n”，但得到“处理城镇时出错：“伦敦”不是有效的城市或已被使用。”

我不知道为什么。

我是否需要将方法 formatCityName 导入到测试文件中，否则它会自行收紧？

感谢您的帮助！

Answer 1

这就是问题所在：

When I saying new town "London"

测试步骤定义将引号视为实际值的一部分。您的游戏代码收到

"London"

作为实际猜测，包括引号。

要么从步骤定义中去掉引号，要么调整游戏代码以去掉引号。