public OpenConfigChannelHandler addLogicalChannelAssignments(
           OpenConfigLogicalChannelAssignmentsHandler logicalChannelAssignments) {
        modelObject.logicalChannelAssignments(logicalChannelAssignments.getModelObject());
        return this;
    }
@Test
    public void testAddLogicalChannelAssignments() {
        // test Handler
        OpenConfigChannelHandler channel = new OpenConfigChannelHandler(1, parent);

        // call addLogicalChannelAssignments
        OpenConfigLogicalChannelAssignmentsHandler logicalChannelAssignments =
            new OpenConfigLogicalChannelAssignmentsHandler(channel);

        // expected ModelObject
        DefaultChannel modelObject = new DefaultChannel();
        modelObject.index(1);
        DefaultLogicalChannelAssignments logicalChannel = new DefaultLogicalChannelAssignments();
        modelObject.logicalChannelAssignments(logicalChannel);

        assertEquals(
        "[NG]addLogicalChannelAssignments:ModelObject(LogicalChannelAssignments added) is not an expected one.\n",
        modelObject, channel.getModelObject());
    }