title: Django Unittests Failing Randomly
body: <p>I am running into this wierd issue of randomly failing unittests. I am basically testing Syndication Feeds</p>
  
  <p>Here is the relevant portion of my code:</p>
  
  <pre><code>class ObjectFeedTests(PuppyTestCase):
  
      def test_object_feeds(self):
          site = Site.objects.get_or_create(id=site_id)[0]
  
          #Some preprocessing and initialization
  
          with self.settings(ROOT_URLCONF='myapp.urls.something'):
  
              #Some more preprocessing is done here
  
              show = ShowFactory.create(slug=show_slug, title=show_name,
                                        site=site)
  
              for feed_name, entry_points in OBJECT_FEEDS.items():
  
                  factory = default_factories[model] #fetches the correct factory
  
                  if feed_name == "podcast":
                      instance = factory.create(show=show, slug="podcasts")
                  else:
                      instance = factory.create()
  
                  #Creates the instance with the factory correctly
  
                  for feed_type in ['rss', 'atom']:
  
                      with self.settings(SITE_ID=site.id):
                          class_url_pattern = feed_class().get_url_pattern()
  
                      slug_of_note = '%s/%s' % (show_slug, instance.slug)
                      presumed_url = '/%s/%s/%s' % (FEED_URL_PREFIXES[feed_type],
                                             feed_name, slug_of_note)
  
                      with self.settings(SITE_ID=site.id):
                          response = self.client.get(presumed_url,
                                          {'password': '****'})
  
                      self.assertContains(response, '&lt;?xml',
                          msg_prefix="%s %s feed raised a 404 \
                          or wasn't XML (tried %s)" \
                              % (feed_name, feed_type, presumed_url))
  
                  # End of our loop.  We'll delete the object
                  # so that we're not hung up by unique_together constraints
                  instance.delete()
  </code></pre>
  
  <p>The factory:</p>
  
  <pre><code>class ShowFactory(factory.Factory):
      FACTORY_FOR = Show
  
      title = factory.Sequence(lambda name: 'My Show {0}'.format(name))
      slug = factory.Sequence(lambda name: 'my-show-{0}'.format(name))
      creator = factory.SubFactory(UserFactory)
      last_editor = factory.SubFactory(UserFactory)
      site = factory.SubFactory(SiteFactory)
      status = STATUS_CHOICES.PUBLISHED
  </code></pre>
  
  <p>Each time I run the test, 3 factories are created, and the tests fail randomly.</p>
  
  <p>If I have left out any local variable declaration in the code here, please ignore it, as I have condensed the code to keep it as small as possible. </p>
  
  <p>I was considering <a href="https://docs.djangoproject.com/en/dev/topics/testing/overview/#liveservertestcase" rel="nofollow">using this</a>, but the results were still the same.</p>
  
  <p>Please let me know if there is any more information I could provide. </p>
  
  <p>Here is the stacktrace of a failure:</p>
  
  <pre><code>======================================================================
  FAIL: test_object_feeds (tests.syndication_tests.ObjectFeedTests)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "tests/cases.py", line 44, in run
      testMethod()
    File "tests/syndication_tests.py", line 370, in test_object_feeds
      presumed_url))
    File "/usr/local/virtualenvs/lib/python2.6/site-packages/django/test/testcases.py", line 622, in assertContains
      " (expected %d)" % (response.status_code, status_code))
  AssertionError: 404 != 200 : people rss feed raised a 404                             or wasn't XML (tried /feeds/show/test-show-0): Couldn't retrieve content: Response code was 404 (expected 200)
  
  ----------------------------------------------------------------------
  
  Ran 5 tests in 10.613s
  
  FAILED (failures=1)
  Destroying test database for alias 'default'...
  </code></pre>
  
  <p>The next time I run it,</p>
  
  <pre><code>======================================================================
  FAIL: test_object_feeds (tests.syndication_tests.ObjectFeedTests)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "tests/cases.py", line 44, in run
      testMethod()
    File "tests/syndication_tests.py", line 370, in test_object_feeds
      presumed_url))
    File "/usr/local/virtualenvs/lib/python2.6/site-packages/django/test/testcases.py", line 622, in assertContains
      " (expected %d)" % (response.status_code, status_code))
  AssertionError: 404 != 200 : channels rss feed raised a 404                             or wasn't XML (tried /feeds/show/test-show-1): Couldn't retrieve content: Response code was 404 (expected 200)
  
  ----------------------------------------------------------------------
  Ran 5 tests in 3.483s
  
  FAILED (failures=1)
  Destroying test database for alias 'default'...
  </code></pre>