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"));
    }

                // 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);

        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);

     *
     * @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(),

     *
     * @param dataMap the document data map containing URL, roles, and virtual host information
     * @return a unique hashed ID string for the document
     */
    public String generateId(final Map<String, Object> dataMap) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String url = (String) dataMap.get(fessConfig.getIndexFieldUrl());

            Map<String, Object> dataMap = new HashMap<>();
            if (responseData != null) {
                dataMap.put("url", responseData.getUrl());
            }
            dataMap.put("content", "test content");
            resultData.setData(dataMap.toString().getBytes());
            return resultData;
        }

        @Override

                    postcard.setDataCrawlStartTime(getValueFromMap(dataMap, "dataCrawlStartTime", StringUtil.EMPTY));
                    postcard.setDataIndexSize(getValueFromMap(dataMap, "dataIndexSize", "0"));
                    postcard.setDataIndexExecTime(getValueFromMap(dataMap, "dataIndexExecTime", "0"));

                // Simulate storing documents
                Map<String, Object> doc1 = new HashMap<>();
                doc1.put("id", "1");
                doc1.put("title", "Document 1");
                callback.store(initParamMap, doc1);

                Map<String, Object> doc2 = new HashMap<>();
                doc2.put("id", "2");
                doc2.put("title", "Document 2");