/**
 * Test class for AbstractRule.
 * Tests the abstract rule implementation and its common functionality.
 */
public class AbstractRuleTest extends PlainTestCase {

    /**
     * Concrete implementation of AbstractRule for testing
     */
    public static class TestAbstractRule extends AbstractRule {
        private static final long serialVersionUID = 1L;

        private boolean matchResult = true;

}

// Wait for completion
crawler.awaitTermination();
System.out.println("Crawling completed");
```

### Custom Content Extractor

```java
public class CustomExtractor extends AbstractExtractor {
    @Override
    public ExtractData getText(final InputStream inputStream, final Map<String, String> params) {
        // Custom extraction logic
        ExtractData extractData = new ExtractData();

import org.opensearch.indices.analysis.AnalysisModule.AnalysisProvider;
import org.opensearch.plugins.AnalysisPlugin;
import org.opensearch.plugins.Plugin;

public class ExtensionPlugin extends Plugin implements AnalysisPlugin {

    @Override
    public Map<String, AnalysisProvider<CharFilterFactory>> getCharFilters() {
        final Map<String, AnalysisProvider<CharFilterFactory>> extra = new HashMap<>();

import org.codelibs.fess.crawler.helper.impl.MimeTypeHelperImpl;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * @author shinsuke
 *
 */
public class CrawlerClientFactoryTest extends PlainTestCase {
    public CrawlerClientFactory clientFactory;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * @author shinsuke
 *
 */
public class XmlExtractorTest extends PlainTestCase {
    private static final Logger logger = LogManager.getLogger(XmlExtractorTest.class);

    public XmlExtractor xmlExtractor;

    @Override
    protected void setUp() throws Exception {

import org.codelibs.fess.crawler.service.impl.UrlFilterServiceImpl;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * @author shinsuke
 *
 */
public class UrlFilterImplTest extends PlainTestCase {
    public UrlFilterImpl urlFilter;

    public MemoryDataHelper dataHelper;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test class for UrlFilter interface.
 * Tests the contract and behavior of UrlFilter implementations.
 */
public class UrlFilterTest extends PlainTestCase {

    private UrlFilter urlFilter;
    private StandardCrawlerContainer container;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

 * It extracts data from an HTML document by applying XPath rules defined in {@link #fieldRuleMap}.
 * The extracted data is then formatted into an XML structure and stored in the {@link ResultData}.
 * <p>
 * This class extends {@link HtmlTransformer} and overrides the {@link #storeData(ResponseData, ResultData)} method
 * to parse the HTML content, evaluate XPath expressions, and generate the XML output.
 * </p>
 * <p>

import org.codelibs.fess.crawler.container.StandardCrawlerContainer;
import org.codelibs.fess.crawler.entity.RobotsTxt;
import org.dbflute.utflute.core.PlainTestCase;

public class RobotsTxtHelperTest extends PlainTestCase {
    public RobotsTxtHelper robotsTxtHelper;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

import org.codelibs.fess.crawler.util.CrawlerWebServer;
import org.codelibs.opensearch.runner.OpenSearchRunner;
import org.dbflute.utflute.lastadi.LastaDiTestCase;

import jakarta.annotation.Resource;

public class CrawlerTest extends LastaDiTestCase {

    @Resource
    private Crawler crawler;

    @Resource
    private DataService dataService;

    @Resource
    private UrlQueueService urlQueueService;

    @Resource