Method ClearScale

tests/unit/scale/ScaleController.h:133–142

    }
    
    static bool ClearScale() {
        nlohmann::json data = {{{"field", "2017"}}};
        scale::ScaleController ctrl(nullptr);
        auto coord = ScaleController::MakeCoord();
        auto &scale = ctrl.CreateScale("field", data, ScaleController::MakeTracer(), coord);
        bool ret1 = ctrl.ScaleCount() == 1;
        ctrl.Clear();
        bool ret2 = ctrl.Empty();
        return ret1 && ret2;
    }
};

}//unit