def assert_foreign_volume(self, flocker_volume):
        self.assertNotIn(flocker_volume, self.api.list_volumes())
position is not set when sent from save(). I assume it
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/testtools/_blockdevice.py/IBlockDeviceAPITestsMixin.assert_foreign_volume--crossover with--dataset/ETHPy150Open django-mptt/django-mptt/tests/myapp/tests.py/Signals.test_move_by_changing_parent_should_send_signal