Question

我已经完成了Django民意调查教程，我希望通过进行测试来检查投票竞争状况here。我发现了一个名为before_after的python包，它可用于进行涉及竞争条件的测试。但是，我不了解before和after方法的参数。我已查看some examples并认为Choice.get_votes是我的第一个参数所需要的，但这会导致我获得ImportError: No module named 'Choice'。有谁知道我需要在我的测试中改变它才能使它工作？

这是我做的测试：

tests.py：

import datetime
from django.utils import timezone
from django.test import TestCase
from .models import Question, Choice
import before_after

def create_question(question_text, days):
    time = timezone.now() + datetime.timedelta(days=days)
    return Question.objects.create(question_text=question_text, pub_date=time)

class ChoiceTest(TestCase):

    def test_race_condition_avoided(self):
        self.assertEqual(self.creating_race_condition(), 2, "Votes do not equal amount expected.")

    def test_race_condition_occurred(self):
        self.assertNotEqual(self.creating_race_condition(), 1, "Votes do equal amount expected from a race condition.")

    def creating_race_condition(self):
        q = create_question('Did the race condition happen?', 0)
        self.choice = q.choice_set.create(choice_text="Let's find out.", votes=0)
        with before_after.after('Choice.get_votes', self.increment_vote):
            self.increment_vote()
        return c.votes

    def increment_vote(self):
        self.choice.votes += 1
        self.choice.save()

    def get_votes(self):
        return self.choice.votes

models.py：

import datetime
from django.utils import timezone
from django.db import models

class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')

    def __str__(self):
        return self.question_text

    def was_published_recently(self):
        now = timezone.now()
        return now - datetime.timedelta(days=1) <= self.pub_date <= now
    was_published_recently.admin_order_field = 'pub_date'
    was_published_recently.boolean = True
    was_published_recently.short_description = 'Published recently?'

class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

    def __str__(self):
        return self.choice_text

我正在使用Python 3.5.1＆amp; Django 1.10.4

Answer 1

before_after需要您使用完整路径来导入函数。

您需要使用'vote.models.Choice.get_votes'之类的str来为其提供完整的导入路径。

与before_after之后的Django竞争条件测试

1 个答案: