Set<BsUser> set = new HashSet<>();
        set.add(entity1);
        set.add(entity2);
        RenderDataUtil.register(data, "set", set);

        Object setResult = data.getDataMap().get("set");
        assertNotNull(setResult);
        assertTrue(setResult instanceof List);
    }

    // Test helper class
    public static class ComplexObject {
        private String value;

        public String getValue() {