Create a test to expose the bug

cmdb/tests.py：

import datetime

from django.test import TestCasefrom

from django.utils import timezone

from .models import Question

class QuestionModelTests(TestCase):

def test_was_published_recently_with_future_question(self):

""" was_published_recently() returns False for questions whose pub_date is in the future. """

time = timezone.now() + datetime.timedelta(days=30)

future_question = Question(pub_date=time)

self.assertIs(future_question.was_published_recently(), False)

打开terminal

1.运行完后在cmdb这目录下寻找tests.py这个文件，

2.找到TestCase的subclass

3.找到里面以test开头的method（所以测试方法必须以test开头）

4.in test_was_published_recently_with_future_question it created a Question instance whose pub_date field is 30 days in the future

5..… and using the assertIs() method, it discovered that its was_published_recently() returns True, though we wanted it to return False

pythonmanage.pytestpollslooked for tests in thepollsapplicationit found a subclass of thedjango.test.TestCaseclassit created a special database for the purpose of testingit looked for test methods - ones whose names begin withtestintest_was_published_recently_with_future_questionit created aQuestioninstance whosepub_datefield is 30 days in the future… and using theassertIs()method, it discovered that itswas_published_recently()returnsTrue, though we wanted it to returnFalse