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

def test_proxy_model_included(self):

    out = StringIO()
    widget = Widget.objects.create(name='grommet')
    management.call_command('dumpdata', 'fixtures_regress.widget', 'fixtures_regress.widgetproxy', format='json', stdout=out)
    self.assertJSONEqual(out.getvalue(), ('[{"pk":    %d,    "model":    "fixtures_regress.widget",    "fields":    {"name":    "grommet"}}]' % widget.pk))
