'Adding a tag differing only in case from existing ones shouldn\'t
create a new tag.'

def test_add_new_case_insensitive(self):

    self.client.post(_add_async_tag_url(self.question.id), data={'tag-name': 'RED'}, HTTP_X_REQUESTED_WITH='XMLHttpRequest')
    tags_eq(Question.objects.get(id=self.question.id), ['red'])
