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

        assertNotNull(mergedItems);
        assertEquals(1, mergedItems.length);
        assertEquals(3, mergedItems[0].getDocFreq());
    }

    @Test
    public void test_mergeItemsWithDifferentTexts() throws Exception {
        String[][] readings1 = new String[1][];
        readings1[0] = new String[] { "test1" };

        secondLine.put("fields", item.getFields());
        secondLine.put("queryFreq", item.getQueryFreq());
        secondLine.put("docFreq", item.getDocFreq());
        secondLine.put("userBoost", item.getUserBoost());
        secondLine.put("score", (item.getQueryFreq() + item.getDocFreq()) * item.getUserBoost());
        secondLine.put("tags", item.getTags());
        secondLine.put("roles", item.getRoles());

        assertNotNull(items);
        assertTrue(items.size() > 0);
        for (SuggestItem item : items) {
            assertEquals(SuggestItem.Kind.DOCUMENT, item.getKinds()[0]);
            assertEquals(1, item.getDocFreq());
        }
    }

    @Test
    public void test_parseDocumentWithTags() throws Exception {
        Map<String, Object> document = new HashMap<>();
        document.put("content", "テストドキュメント");