assertTrue(status == CrawlerStatus.RUNNING || status == CrawlerStatus.DONE);
        assertFalse(status == CrawlerStatus.INITIALIZING && status == CrawlerStatus.DONE);
    }

    /**
     * Test null safety in comparisons
     */
    public void test_nullSafety() {
        CrawlerStatus status = CrawlerStatus.INITIALIZING;
        CrawlerStatus nullStatus = null;

        // Enum == null should be false

 * comparator is not consistent with {@code equals}.
 *
 * <p>The {@code standard} methods are not guaranteed to be thread-safe, even when all of the
 * methods that they depend on are thread-safe.
 *
 * @author Mike Bostock
 * @author Louis Wasserman
 * @since 2.0
 */
@GwtCompatible

 * <pre>
 * {@code
 * String escapedXml = XmlUtil.escapeXml("<tag>value</tag>");
 * Map<String, Object> dataMap = XmlUtil.getDataMap(accessResultData);
 * }
 * </pre>
 *
 * <h2>Thread Safety:</h2>
 * <p>
 * This class is thread-safe as it does not maintain any state.
 * </p>
 *
 * <h2>Dependencies:</h2>
 * <ul>
 *   <li>org.apache.logging.log4j.Logger</li>
 *   <li>org.apache.logging.log4j.LogManager</li>

     *  The implementation of this is a little slow, since it creates
     *  a number of objects each time it is called.  This could be optimized
     *  to keep the same objects around, but then thread-safety issues would arise.
     *
     *  @param contextNode The node to start searching from.
     *  @param expression A valid XPath string.

 * thread-safe, even when all of the methods that they depend on are thread-safe.
 *
 * @author Mike Bostock
 * @author Louis Wasserman
 * @since 2.0
 */
@GwtCompatible
public abstract class ForwardingList<E extends @Nullable Object> extends ForwardingCollection<E>
    implements List<E> {
  // TODO(lowasser): identify places where thread safety is actually lost

        // but PrintStream doesn't throw exceptions on write after close
    }

    @Test
    void testConcurrentAccess() throws InterruptedException {
        // Test thread safety of getInstance
        LogStream.setInstance(testStream);

        final LogStream[] instances = new LogStream[10];
        Thread[] threads = new Thread[10];

        for (int i = 0; i < threads.length; i++) {

        assertNotNull(provider2.providePrimaryOneWayCryptographer());
        assertNotSame(provider1.providePrimaryOneWayCryptographer(), provider2.providePrimaryOneWayCryptographer());
    }

    // Test thread safety
    public void test_threadSafety() {
        // Test that the provider returns the same instances in multi-threaded environment
        final int threadCount = 10;
        final Thread[] threads = new Thread[threadCount];

 *   <li>Checking if a URL has already been visited.</li>
 *   <li>Generating URL queues from a previous session's access results.</li>
 * </ul>
 *
 * <p>
 * The class uses synchronization to ensure thread safety when accessing and modifying the URL queue.
 * It also checks for duplicate URLs before adding them to the queue,
 * both within the queue itself and against previously accessed URLs stored in the {@link MemoryDataHelper}.
 * </p>

            assertEquals(4, written);
            assertEquals(4, SMBUtil.readInt2(largeBuffer, 5000));
        }

        @Test
        @DisplayName("Should maintain thread safety")
        void testThreadSafety() throws InterruptedException {
            int threadCount = 10;
            Thread[] threads = new Thread[threadCount];
            boolean[] success = new boolean[threadCount];

        assertEquals(0, stats.consecutiveFailures);
        assertEquals(SimpleCircuitBreaker.State.CLOSED, circuitBreaker.getState());
    }

    @RepeatedTest(10)
    @DisplayName("Test thread safety")
    void testThreadSafety() throws InterruptedException {
        SimpleCircuitBreaker breaker = new SimpleCircuitBreaker("concurrent", 5, 3, 100);
        AtomicInteger successCount = new AtomicInteger(0);