'``Volume.change_owner`` returns a ``Deferred`` that fires with a new
``Volume`` with the new owner node ID and the same name.'

def test_return(self):

    volume = self.successResultOf(self.service.create(self.service.get(MY_VOLUME)))
    new_volume = self.successResultOf(volume.change_owner(self.other_node_id))
    self.assertEqual({'node_id': new_volume.node_id, 'name': new_volume.name}, {'node_id': self.other_node_id, 'name': MY_VOLUME})
