'The default for for_concrete_model should be True'

def test_default_behavior(self):

    base = ForConcreteModelModel()
    base.obj = rel = ProxyRelatedModel.objects.create()
    base.save()
    base = ForConcreteModelModel.objects.get(pk=base.pk)
    rel = ConcreteRelatedModel.objects.get(pk=rel.pk)
    self.assertEqual(base.obj, rel)
