* different types of processing states and a method to introduce a delay
 * based on the type of processing.
 * <p>
 * Constants:
 * </p>
 * <ul>
 *   <li>{@code PRE_PROCESSING} - Represents the pre-processing state.</li>
 *   <li>{@code POST_PROCESSING} - Represents the post-processing state.</li>
 *   <li>{@code NO_URL_IN_QUEUE} - Indicates that there are no URLs in the queue.</li>

 */
public class RuleTest extends PlainTestCase {

    /**
     * Test implementation of Rule interface for testing purposes
     */
    public static class TestRule implements Rule {
        private static final long serialVersionUID = 1L;

        private final String ruleId;
        private final ResponseProcessor responseProcessor;
        private final boolean matchResult;

        public int getState() {
            return state;
        }

        public void reset() {
            processedUrls.clear();
            state = 0;
        }
    }

    /**
     * Test AccessResultData implementation
     */
    public static class TestAccessResultData<T> implements AccessResultData<T>, Serializable {
        private static final long serialVersionUID = 1L;
        private T id;

        // Enum instances are singletons
        CrawlerStatus status1 = CrawlerStatus.INITIALIZING;
        CrawlerStatus status2 = CrawlerStatus.INITIALIZING;

        // Should be the same instance
        assertSame(status1, status2);
        assertTrue(status1 == status2);

        // valueOf should return the same instance
        CrawlerStatus status3 = CrawlerStatus.valueOf("INITIALIZING");

     */
    public static final String PARENT_URL = "parentUrl";

    /**
     * Field name for status.
     */
    public static final String STATUS = "status";

    /**
     * Field name for HTTP status code.
     */
    public static final String HTTP_STATUS_CODE = "httpStatusCode";

    /**
     * Field name for method.
     */
    public static final String METHOD = "method";

    /**

     * The POST method.
     */
    public static final String POST_METHOD = "POST";

    /**
     * The status code for OK.
     */
    public static final int OK_STATUS = 0;

    /**
     * The status code for Not Modified.
     */
    public static final int NOT_MODIFIED_STATUS = 304;

    /**
     * The HTTP status code for OK.
     */
    public static final int OK_STATUS_CODE = 200;

    /**

 */
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;
        private int matchCallCount = 0;
        private ResponseData lastResponseData = null;

String sessionId = crawler.execute();
```

### Background Crawling

```java
// Configure for background execution
crawler.setBackground(true);
String sessionId = crawler.execute();

// Check crawling status
while (crawler.crawlerContext.getStatus() == CrawlerStatus.RUNNING) {
    Thread.sleep(1000);
    System.out.println("Crawling in progress...");
}

// Wait for completion
crawler.awaitTermination();

    public static final String PROXY_PORT_PROPERTY = "proxyPort";

    /** Property name for proxy authentication scheme setting */
    public static final String PROXY_AUTH_SCHEME_PROPERTY = "proxyAuthScheme";

    /** Property name for proxy credentials setting */
    public static final String PROXY_CREDENTIALS_PROPERTY = "proxyCredentials";

    /** Property name for user agent setting */

        endLatch.await(10, TimeUnit.SECONDS);
        executor.shutdown();

        assertEquals(threadCount * operationsPerThread, crawlerContext.getAccessCount());
    }

    /**
     * Test status getter and setter
     */
    public void test_status() {
        assertEquals(CrawlerStatus.INITIALIZING, crawlerContext.getStatus());

        crawlerContext.setStatus(CrawlerStatus.RUNNING);