Django和鼻测试：DoesNotExist:<；对象>；匹配的查询不存在

我正在django上启动一个小应用程序。目前，它的目标只是管理测试人员（又名用户）和团队。这是我的model.py：

from django.db import models

class Team(models.Model):
    name = models.CharField(max_length=200)
    def __unicode__(self):
        return self.name
    def get_testers(self):
        return self.tester_set.all()

class Tester(models.Model):
    team = models.ForeignKey(Team)
    visa = models.CharField(max_length=3)
    privileged = models.BooleanField()
    def __unicode__(self):
        return self.visa

我正试图为“get_testers”函数编写一个测试。 这是：

from models import Team, Tester
def testTeamGetTesters_test():
    t = list(Team.objects.get(id=2L).get_testers())

    a = Tester(visa = 'a', privileged = True)
    b = Tester(visa = 'b', privileged = True)

    assert(t[0].visa == a.visa and t[0].privileged == a.privileged and t[1].visa == b.visa and t[1].privileged == b.privileged)

但当我跑步时：

$ python manage.py test tmg

我得到这个错误：

nosetests --verbosity 1 tmg
E
======================================================================
ERROR: tempsite.tmg.tests.testTeamGetTesters_test
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/nose/case.py", line 183, in runTest
    self.test(*self.arg)
  File "/home/charlie/code/tempsite/../tempsite/tmg/tests.py", line 8, in testTeamGetTesters_test
    t = list(Team.objects.get(id=2L).get_testers())
  File "/usr/lib/pymodules/python2.6/django/db/models/manager.py", line 132, in get
    return self.get_query_set().get(*args, **kwargs)
  File "/usr/lib/pymodules/python2.6/django/db/models/query.py", line 341, in get
    % self.model._meta.object_name)
DoesNotExist: Team matching query does not exist.

因此，我编写了大致相同的测试，但可以直接运行：

from models import Team, Tester

t = list(Team.objects.get(id=2L).get_testers())

a = Tester(visa = 'a', privileged = True)
b = Tester(visa = 'b', privileged = True)

print "%r" % (t[0].visa == a.visa and t[0].privileged == a.privileged and t[1].visa == b.visa and t[1].privileged == b.privileged)

…当我运行它时：

$ python tests.py
True

---

这是非常令人困惑的。。。我检查了数据库，所有的对象都被完美地检索到，但是我仍然得到这个错误…

您是否在测试中的某个地方创建了id为2的团队对象？不要忘记测试从一个空白数据库开始。

您是否在测试中的某个地方创建id为2的团队对象？别忘了测试是从一个空白数据库开始的