Collections.addAll(roleList, item1.getRoles());
        for (final String role : item2.getRoles()) {
            if (!roleList.contains(role)) {
                roleList.add(role);
            }
        }
        mergedItem.roles = roleList.toArray(new String[roleList.size()]);

        mergedItem.kinds = concatKinds(item1.kinds, item2.kinds);
        mergedItem.timestamp = item2.timestamp;

        String[] text2 = { "item2" }; // Different text -> different ID
        String[][] readings2 = { { "read2" } };
        SuggestItem item2 = new SuggestItem(text2, readings2, null, 0L, 0L, 1.0f, null, null, null, SuggestItem.Kind.QUERY);

        SuggestItem.merge(item1, item2); // Should throw IllegalArgumentException
    }

        SuggestItem item2 = new SuggestItem(new String[] { "テスト" }, readings, new String[] { "content" }, 2, 0, -1, new String[] { "tag2" },
                new String[] { SuggestConstants.DEFAULT_ROLE }, null, SuggestItem.Kind.DOCUMENT);

        SuggestItem[] mergedItems = writer.mergeItems(new SuggestItem[] { item1, item2 });

        assertNotNull(mergedItems);

        assertEquals("123", testTransformer.getData(intData));

        // List data
        List<String> list = new ArrayList<>();
        list.add("item1");
        list.add("item2");
        TestAccessResultData<String> listData = new TestAccessResultData<>(list.toString().getBytes());
        Object retrievedList = testTransformer.getData(listData);
        assertEquals(list.toString(), retrievedList);