'Concrete model subclasses with generic relations work
correctly (ticket 11263).'

def test_subclasses_with_gen_rel(self):

    granite = Rock.objects.create(name='granite', hardness=5)
    TaggedItem.objects.create(content_object=granite, tag='countertop')
    self.assertEqual(Rock.objects.get(tags__tag='countertop'), granite)
