def test_removeNonexistentTrigger(self):
        self.assertRaises(ValueError, self.event.removeTrigger, object())
``shared_state_changes`` returns a ``NodeState`` with
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_internet.py/ThreePhaseEventTests.test_removeNonexistentTrigger--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/test/test_blockdevice.py/BlockDeviceDeployerLocalStateTests.test_shared_changes