public void test_interfaceImplementation() {
        // Test that UrlQueueImpl implements UrlQueue
        UrlQueueImpl<Long> queue = new UrlQueueImpl<>();
        assertTrue(queue instanceof UrlQueue);
    }

    public void test_genericTypeFlexibility() {
        // Test with different generic types
        UrlQueueImpl<Integer> intQueue = new UrlQueueImpl<>();
        intQueue.setId(42);

        String sessionId = "session123";
        Queue<UrlQueueImpl<Long>> existingQueue = new LinkedList<>();
        Map<String, AccessResultImpl<Long>> accessResultMap = new HashMap<>();

        UrlQueueImpl<Long> newUrl1 = new UrlQueueImpl<>();
        newUrl1.setSessionId(sessionId);
        newUrl1.setUrl("https://example.com/new1");

        UrlQueueImpl<Long> newUrl2 = new UrlQueueImpl<>();
        newUrl2.setSessionId(sessionId);

        when(urlFilter.match(anyString())).thenReturn(true);
        when(crawlerContainer.getComponent("urlQueue")).thenReturn(new UrlQueueImpl<>(), new UrlQueueImpl<>());

        // Use reflection to access protected method
        final java.lang.reflect.Method method = CrawlerThread.class.getDeclaredMethod("storeChildUrls", Set.class, String.class, int.class);

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import org.codelibs.fess.crawler.entity.UrlQueue;
import org.codelibs.fess.crawler.entity.UrlQueueImpl;
import org.codelibs.fess.crawler.util.CrawlingParameterUtil;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * @author hayato
 *
 */
public class HostIntervalControllerTest extends PlainTestCase {

import org.codelibs.fess.crawler.container.StandardCrawlerContainer;
import org.codelibs.fess.crawler.entity.AccessResultImpl;
import org.codelibs.fess.crawler.entity.UrlQueue;
import org.codelibs.fess.crawler.entity.UrlQueueImpl;
import org.codelibs.fess.crawler.extractor.ExtractorFactory;
import org.codelibs.fess.crawler.extractor.impl.TikaExtractor;
import org.codelibs.fess.crawler.filter.impl.UrlFilterImpl;