def test_cannotSign(self):
        cr = CertificateRequest.load(makeCertRequest("example.com"))
        class FakeService(object):
            portal = None

        q = Q2Q()
        q.service = FakeService()

        d = callResponder(q, Sign,
                          certificate_request=cr,
                          password='hunter2')
        self.failureResultOf(d, amp.RemoteAmpError)
Vertex nodes with no portal will not sign cert requests.
dataset/ETHPy150Open twisted/vertex/vertex/test/test_identity.py/SignTests.test_cannotSign