assertEquals(20L, merged.getQueryFreq()); // 5 + 15
        assertEquals(2.0f, merged.getUserBoost(), 0.001f); // max(1.0, 2.0)
    }

    @Test
    public void testMerge_tags() {
        SuggestItem item1 = createItemWithTags("text", "tag1", "tag2");
        SuggestItem item2 = createItemWithTags("text", "tag2", "tag3");

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