Rule matchedRule = ruleManager.getRule(responseData);

        assertNull(matchedRule);
    }

    /**
     * Test getRule with null ResponseData
     */
    public void test_getRule_nullResponseData() {
        TestRule rule = new TestRule("rule1", true);

        ruleManager.addRule(rule);

        Rule matchedRule = ruleManager.getRule(null);

        assertNull(matchedRule);
    }

     * Test RuleManager implementation
     */
    public static class TestRuleManager implements RuleManager {
        private final List<Rule> rules = new ArrayList<>();

        @Override
        public Rule getRule(ResponseData responseData) {
            for (Rule rule : rules) {
                if (rule != null && rule.match(responseData)) {
                    return rule;
                }
            }

     */
    protected void processResponse(final UrlQueue<?> urlQueue, final ResponseData responseData) {
        // get a rule
        final Rule rule = crawlerContext.ruleManager.getRule(responseData);
        if (rule == null) {
            log(logHelper, LogType.NO_RULE, crawlerContext, urlQueue, responseData);
        } else {
            responseData.setRuleId(rule.getRuleId());

        }
    }

    /**
     * Test implementation of RuleManager for testing
     */
    private static class TestRuleManager implements RuleManager {
        @Override
        public Rule getRule(ResponseData responseData) {
            return null;
        }

        @Override
        public void addRule(Rule rule) {
        }

        @Override
        public void addRule(int index, Rule rule) {

        } catch (final Exception e) {
            throw new ExtractException("Failed to extract data.", e);
        } finally {
            if (dfos != null && !dfos.isInMemory()) {
                final File file = dfos.getFile();
                try {
                    Files.delete(file.toPath());
                } catch (final IOException e) {
                    logger.warn("Failed to delete {}.", file.getAbsolutePath(), e);

        if (dfos.isInMemory()) {
            return new ByteArrayInputStream(dfos.getData());
        }
        return new BufferedInputStream(new FileInputStream(dfos.getFile()));
    }

    /**
     * Returns a content from a writer.
     *
     * @param out A content writer.
     * @param encoding An encoding.
     * @param normalizeText If true, normalize a text.

                    if (annotation instanceof final PDAnnotationFileAttachment annotationFileAttachment) {
                        final PDFileSpecification fileSpec = annotationFileAttachment.getFile();
                        if (fileSpec instanceof final PDComplexFileSpecification complexFileSpec) {
                            final PDEmbeddedFile embeddedFile = getEmbeddedFile(complexFileSpec);