'Assert adding an unapplied tag.'

def test_add_async_existent_tag(self):

    TagFactory(name='purplepurplepurple', slug='purplepurplepurple')
    response = self.client.post(_add_async_tag_url(self.question.id), data={'tag-name': '    PURplepurplepurple    '}, HTTP_X_REQUESTED_WITH='XMLHttpRequest')
    self.assertContains(response, 'canonicalName')
    tags = Question.objects.get(id=self.question.id).tags.all()
    eq_([t.name for t in tags], ['purplepurplepurple'])
