'Regression for #11428 - Proxy models aren\'t included when you dumpdata'

def test_proxy_model_included(self):

    stdout = StringIO()
    Widget(name='grommet').save()
    management.call_command('dumpdata', 'fixtures_regress.widget', 'fixtures_regress.widgetproxy', format='json', stdout=stdout)
    self.assertEqual(stdout.getvalue(), '[{"pk":    1,    "model":    "fixtures_regress.widget",    "fields":    {"name":    "grommet"}}]')
