public OpenConfigConfigOfTransceiverHandler addEnabled(boolean enabled) {
        modelObject.enabled(enabled);
        return this;
    }
@Test
    public void testAddEnabled() {
        // test Handler
        OpenConfigConfigOfTransceiverHandler config = new OpenConfigConfigOfTransceiverHandler(parent);

        // call addEnabled
        config.addEnabled(true);

        // expected ModelObject
        DefaultConfig modelObject = new DefaultConfig();
        modelObject.enabled(true);

        assertEquals("[NG]addEnabled:ModelObject(Enabled added) is not an expected one.\n",
                     modelObject, config.getModelObject());
    }