'Determine whether or not the given volume belongs to a test-created
Flocker cluster (and is therefore subject to automatic destruction).
:return: ``True`` if it does, ``False`` if it does not.'

def _is_test_volume(self, volume):

    try:
        cluster_id = self._get_cluster_id(volume)
    except KeyError:
        return False
    return self._is_test_cluster(cluster_id)
