ResponseData data = new ResponseData();

        data.addMetaData("key1", "value1");

        Map<String, Object> metaDataMap = data.getMetaDataMap();
        metaDataMap.put("key2", "value2");

        assertEquals(2, data.getMetaDataMap().size());
    }

    public void test_childUrlOperations() {
        // Test child URL operations
        ResponseData data = new ResponseData();

            assertEquals("file1", new String(InputStreamUtil.getBytes(responseData.getResponseBody())));
            assertEquals(5, responseData.getContentLength());
            assertEquals("label1", responseData.getMetaDataMap().get("label"));
        }
        try (final ResponseData responseData = gcsClient.doGet("gcs://fess/dir1/file2.txt")) {
            assertEquals("gcs://fess/dir1/file2.txt", responseData.getUrl());

            assertEquals("file1", new String(InputStreamUtil.getBytes(responseData.getResponseBody())));
            assertEquals(5, responseData.getContentLength());
            assertEquals("label1", responseData.getMetaDataMap().get("label"));
        }
        try (final ResponseData responseData = storageClient.doGet("storage://fess/dir1/file2.txt")) {
            assertEquals("storage://fess/dir1/file2.txt", responseData.getUrl());

            assertEquals("file1", new String(InputStreamUtil.getBytes(responseData.getResponseBody())));
            assertEquals(5, responseData.getContentLength());
            assertEquals("label1", responseData.getMetaDataMap().get("label"));
        }
        try (final ResponseData responseData = s3Client.doGet("s3://fess/dir1/file2.txt")) {
            assertEquals("s3://fess/dir1/file2.txt", responseData.getUrl());

            final String owner = (String) responseData.getMetaDataMap().get(FtpClient.FTP_FILE_USER);
            if (owner != null) {
                roleTypeList.add(systemHelper.getSearchRoleByUser(owner));
            }
            final String group = (String) responseData.getMetaDataMap().get(FtpClient.FTP_FILE_GROUP);
            if (group != null) {

        processor.process(responseData);

        // Verify metadata is unchanged
        assertEquals(2, responseData.getMetaDataMap().size());
        assertEquals("value1", responseData.getMetaDataMap().get("key1"));
        assertEquals(123, responseData.getMetaDataMap().get("key2"));
    }

    public void test_processWithResponseDataContainingChildUrls() {

            if (configParam != null && Constants.TRUE.equalsIgnoreCase(configParam.get(Param.Config.KEEP_ORIGINAL_BODY))) {
                return content;
            }
        }

        if (responseData.getMetaDataMap().get(Extractor.class.getSimpleName()) instanceof TikaExtractor) {
            return content;
        }

        final int maxAlphanumTermSize = getMaxAlphanumTermSize();

                storeChildUrls(responseData, resultData);
            }
        } finally {
            xpathAPI.remove();
        }

        final Object redirectUrlObj = responseData.getMetaDataMap().get(LOCATION_HEADER);
        if (redirectUrlObj instanceof String) {
            final UrlConvertHelper urlConvertHelper = crawlerContainer.getComponent("urlConvertHelper");
            final String redirectUrl;

                return;
            }
        } else if (Boolean.parseBoolean(ignore)) {
            return;
        }

        // X-Robots-Tag
        responseData.getMetaDataMap()
                .entrySet()
                .stream()
                .filter(e -> X_ROBOTS_TAG.equalsIgnoreCase(e.getKey()) && e.getValue() != null)
                .forEach(e -> {