Map<String, Object> dataMap = new HashMap<>();
        dataMap.put("url", "http://example.com/test");
        dataMap.put("label", new String[] { "existing" });

        // Execute
        indexUpdateCallback.store(paramMap, dataMap);

        // Verify labels are merged
        String[] labels = (String[]) dataMap.get("label");
        assertEquals(3, labels.length);

        TestFessTransformer transformer = new TestFessTransformer();
        Map<String, Object> dataMap = new HashMap<>();

        transformer.putResultDataBody(dataMap, "mixed", "string");
        transformer.putResultDataBody(dataMap, "mixed", 123);
        transformer.putResultDataBody(dataMap, "mixed", true);

        Object result = dataMap.get("mixed");
        assertTrue(result instanceof Object[]);

        IndexUpdateCallback callback = new IndexUpdateCallback() {
            @Override
            public void store(DataStoreParams paramMap, Map<String, Object> dataMap) {
                assertNotNull(paramMap);
                assertNotNull(dataMap);
                assertTrue(dataMap.isEmpty());
                storeCount.incrementAndGet();
            }

            @Override
            public long getDocumentSize() {

        Map<String, Object> dataMap = new HashMap<>();
        dataMap.put("a", "A0");
        Map<String, Object> responseDataMap = new HashMap<>();
        responseDataMap.put("b", "B1");

        indexUpdateCallback.mergeResponseData(dataMap, responseDataMap);

        assertEquals(2, dataMap.size());
        assertEquals("A0", dataMap.get("a"));
        assertEquals("B1", dataMap.get("b"));
    }

     *
     * @param responseData the response data from crawling
     * @param dataMap the data map containing extracted field values
     */
    protected void normalizeData(final ResponseData responseData, final Map<String, Object> dataMap) {
        final Object titleObj = dataMap.get(fessConfig.getIndexFieldTitle());
        if (titleObj != null) {
            dataMap.put(fessConfig.getIndexFieldTitle(),

        Map<String, Object> dataMap = new HashMap<>();
        assertEquals("", documentHelper.getContent(null, responseData, null, dataMap));
        assertEquals("", documentHelper.getContent(null, responseData, "", dataMap));
        assertEquals("", documentHelper.getContent(null, responseData, " ", dataMap));
        assertEquals("", documentHelper.getContent(null, responseData, "  ", dataMap));

        method.setAccessible(true);

        Map<String, String> dataMap = new HashMap<>();
        dataMap.put("key1", "value1");
        dataMap.put("key2", "");
        dataMap.put("key3", null);

        // Test with existing value
        String result1 = (String) method.invoke(crawler, dataMap, "key1", "default");
        assertEquals("value1", result1);

        // Test with empty value

        Object target = value;
        if (template != null) {
            final Map<String, Object> contextMap = new HashMap<>();
            contextMap.put("doc", dataMap);
            final Map<String, Object> paramMap = new HashMap<>(dataMap.size() + 2);
            paramMap.putAll(dataMap);
            paramMap.put("value", target);
            paramMap.put("context", contextMap);

                // text cache
                putResultDataBody(dataMap, fessConfig.getIndexFieldCache(), cache);
                putResultDataBody(dataMap, fessConfig.getIndexFieldHasCache(), Constants.TRUE);
            }
        }
        // digest
        putResultDataBody(dataMap, fessConfig.getIndexFieldDigest(),
                documentHelper.getDigest(responseData, bodyBase, dataMap, fessConfig.getCrawlerDocumentFileMaxDigestLengthAsInteger()));

                crawlingInfoHelper.generateId(dataMap));
    }

    @Test
    public void test_generateId_virtualHost() {
        final Map<String, Object> dataMap = new HashMap<String, Object>();
        dataMap.put("url", "http://example.com/");
        final List<String> roleTypeList = new ArrayList<String>();
        roleTypeList.add("admin");
        dataMap.put("role", roleTypeList);