'Instances of the proxy should be returned when
for_concrete_model is False.'

def test_proxy_is_returned(self):

    base = ForProxyModelModel()
    base.obj = ProxyRelatedModel.objects.create()
    base.save()
    base = ForProxyModelModel.objects.get(pk=base.pk)
    self.assertIsInstance(base.obj, ProxyRelatedModel)
