def test_success(self):
        result = _sync_command_error_squashed(
            [b"python", b"-c", b""],
            Logger())
        self.assertIs(None, result)
``_sync_command_error_squashed`` runs the given command and returns
dataset/ETHPy150Open ClusterHQ/flocker/flocker/volume/test/test_filesystems_zfs.py/SyncCommandTests.test_success