def test_fake_lvcreate_called_with_wrong_params(self):
        lvsubsystem = lvmlib.LVSubsystem(mock.Mock(), mock.Mock())
        lvsubsystem.add_volume_group('vg')

        exec_result = lvsubsystem.fake_lvcreate(
            "someprog --something-stupid -n name n -L 100 vg".split(), '')

        self.assertExecutionFailed(exec_result)