@SuppressWarnings("unchecked")
        List<String> tags = (List<String>) updated.get(FieldNames.TAGS);
        assertTrue(tags.contains("existing"));
    }

    @Test
    public void testConcatValues() {
        // Test static concatValues method
        List<String> dest = new java.util.ArrayList<>();
        dest.add("existing");

        SuggestItem.concatValues(dest, "new1", "new2", "existing");