title: MultipleObjectsReturned: get() returned more than one Feed -- it returned 2
body: <p>I'm writing some simple test for a <code>django-model</code> and I'm just using <code>assertEqual</code> and <code>assertNotEqual</code> for it.
  Now I'm not fully grasping how to test <code>BooleanField</code> in this case. I have a <code>model</code> field like this:</p>
  
  <p><code>duplicate = models.BooleanField(default=False)</code></p>
  
  <p>and I'm writing this test for it, just to check if it is equal:</p>
  
  <pre><code>def test_feed_duplicate_create(self):
      stefan_feed_duplicate = Feed.objects.get(duplicate='False')
      milan_feed_duplicate = Feed.objects.get(duplicate='False')
      self.assertEqual(
          stefan_feed_duplicate.duplicate, 'False'
      )
      self.assertEqual(
          milan_feed_duplicate.duplicate, 'False'
      )
  </code></pre>
  
  <p>But the error that I'm facing is:</p>
  
  <pre><code>(venv) vagrant@jessie:/var/www/vhosts/bspotted.net/app$ ./manage.py test --keepdb socialmedia
  nosetests socialmedia --verbosity=1
  Using existing test database for alias 'default'...
  ............E....................
  ======================================================================
  ERROR: test_feed_duplicate_create (app.socialmedia.tests.test_feed_model.CommentsTest)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/var/www/vhosts/bspotted.net/app/socialmedia/tests/test_feed_model.py", line 225, in test_feed_duplicate_create
      stefan_feed_duplicate = Feed.objects.get(duplicate='False')
    File "/var/www/vhosts/bspotted.net/venv/lib/python3.4/site-packages/django/db/models/manager.py", line 127, in manager_method
      return getattr(self.get_queryset(), name)(*args, **kwargs)
    File "/var/www/vhosts/bspotted.net/venv/lib/python3.4/site-packages/django/db/models/query.py", line 338, in get
      (self.model._meta.object_name, num)
  socialmedia.models.feed.MultipleObjectsReturned: get() returned more than one Feed -- it returned 2!
  
  ----------------------------------------------------------------------
  Ran 33 tests in 0.159s
  </code></pre>
  
  <p>Can someone explain me what is the proper way of testing <code>BooleanField</code> in this case? Thanks.</p>