def METHOD_NAME(self):
    """Ensure simplest use-case"""
    pbm = PolicyBindingModel.objects.create()
    PolicyBinding.objects.create(target=pbm, policy=self.policy_true, order=0)
    engine = PolicyEngine(pbm, self.user)
    result = engine.build().result
    self.assertEqual(result.passing, True)
    self.assertEqual(result.messages, ("dummy",))