public OpenConfigConfigOfAssignmentHandler addLogicalChannel(String logicalChannel) {
        modelObject.logicalChannel(logicalChannel);
        return this;
    }
@Test
    public void testAddLogicalChannel() {
        // test Handler
        OpenConfigConfigOfAssignmentHandler config = new OpenConfigConfigOfAssignmentHandler(parent);

        // call addLogicalChannel
        config.addLogicalChannel("name");

        // expected ModelObject
        DefaultConfig modelObject = new DefaultConfig();
        modelObject.logicalChannel("name");

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