assertTrue(langSet.contains("en"));
        assertTrue(langSet.contains("ja"));
        assertTrue(langSet.contains("zh"));
    }

    @Test
    public void testMerge_preservesText() {
        SuggestItem item1 = createItem("test text", 10L, 5L, 1.0f);
        SuggestItem item2 = createItem("test text", 20L, 15L, 2.0f);

        SuggestItem merged = SuggestItemMerger.merge(item1, item2);