'When for_concrete_model is False, we should still be able to get
an instance of the concrete class.'

def test_works_normally(self):

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