def test_no_common(self):
        self.assertIs(
            None,
            _latest_common_snapshot(
                [Snapshot(name=b"a")], [Snapshot(name=b"b")]))
If there are no common ``Snapshot`` instances in the two ``list``\ s,
dataset/ETHPy150Open ClusterHQ/flocker/flocker/volume/test/test_filesystems_zfs.py/LatestCommonSnapshotTests.test_no_common