'``UnknownInstanceID`` is raised if all node UUID lookup mechanisms
fail.'

def test_unknown_instance_id(self):

    patch = MonkeyPatcher()
    patch.addPatch(self.api, '_config_drive_label', filesystem_label_for_test(self))
    patch.addPatch(self.api, '_metadata_service_endpoint', find_free_port())
    self.addCleanup(patch.restore)
    patch.patch()
    self.assertRaises(UnknownInstanceID, self.api.compute_instance_id)
