'Patch _post_teardown so connections don\'t get closed.
In django 1.6\'s _post_teardown connections are closed and we don\'t want
that to happen after each test anymore.  This method isn\'t copied from
Django 1.8 code.
https://github.com/django/django/blob/1.6.10/django/test/testcases.py
#L788'

def _post_teardown(self):

    if (not self._should_reload_connections()):
        real_connections_all = connections.all
        connections.all = (lambda : [])
    super(ClassFixtureTestCase, self)._post_teardown()
    if (not self._should_reload_connections()):
        connections.all = real_connections_all
