def test_compute_instance_id_nonempty(self):
        self.assertNotEqual(u"", self.this_node)
``compute_instance_id`` returns a non-empty string.
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/testtools/_blockdevice.py/IBlockDeviceAPITestsMixin.test_compute_instance_id_nonempty