def test_validate(stc):
    sequencer = CStcSystem.Instance().GetObject("Sequencer")
    ctor = CScriptableCreator()
    cmd = ctor.Create(RPKG + ".CreateRouteMixCommand", sequencer)
    gtc_p = patch(RPKG + ".CreateRouteMixCommand.get_this_cmd",
                  new=MagicMock(return_value=cmd))
    gtc_p.start()

    # Signature
    # validate(TargetObjectList, TargetObjectTagList, MixInfo,
    #          MixTagName, AutoExpandTemplate)
    res = CreateRouteMixCmd.validate([], [], "", "", False)
    assert res == ""
    gtc_p.stop()