assertNotNull(result);
        assertSame(messages, result);
        assertTrue(messages.hasMessageOf(property));
    }

    // Test null property handling
    public void test_addErrorsFrontHeader_nullProperty() {
        try {
            messages.addErrorsFrontHeader(null);
            fail("Should throw exception for null property");

 * This class extends XpathTransformer to provide Fess-specific document processing capabilities
 * including content extraction, metadata processing, and robots tag handling.
 */
public class FessXpathTransformer extends XpathTransformer implements FessTransformer {

    /** Logger instance for this class */

   *
   * @since 32.0.0
   */
  public static final String OBSERVE_BROWSING_TOPICS = "Observe-Browsing-Topics";

  /**
   * The HTTP <a
   * href="https://wicg.github.io/turtledove/#handling-direct-from-seller-signals">{@code
   * Sec-Ad-Auction-Fetch}</a> header field name.
   *
   * @since 33.0.0
   */
  public static final String SEC_AD_AUCTION_FETCH = "Sec-Ad-Auction-Fetch";

  /**

        assertTrue(result.contains("Skipped to purge job logs"));
        assertTrue(result.contains("Skipped to purge user info logs"));
    }

    // Test crawlingInfoService exception handling
    public void test_execute_crawlingInfoException() {
        // Setup tracking variables
        final boolean[] deleteSearchLogCalled = { false };
        final boolean[] deleteJobLogCalled = { false };

            assertTrue((noPropagation & ACE.FLAGS_NO_PROPAGATE) != 0, "Should include no propagate flag");
        }
    }

    @Nested
    @DisplayName("Interface Edge Case Handling")
    class InterfaceEdgeCaseTests {

        @Test
        @DisplayName("Should handle null SID from interface methods")
        void shouldHandleNullSID() {
            ACE ace = mock(ACE.class);

 *
 * <p>Key features:</p>
 * <ul>
 *   <li>Concurrent crawler process management with configurable limits</li>
 *   <li>Selective crawling based on configuration IDs</li>
 *   <li>Document expiration handling</li>
 *   <li>Hot thread monitoring for performance analysis</li>
 *   <li>Process isolation with separate JVM</li>
 * </ul>
 */
public class CrawlJob extends ExecJob {

            if (semaphoreAcquired) {
                requestSemaphore.release();
            }
        }
    }

    /**
     * Execute an operation with circuit breaker protection and custom error handling
     *
     * @param <T> return type
     * @param operation the operation to execute
     * @param isFailure custom failure detection
     * @return operation result

                }
                curReq = next;
                curResp = next.getResponse();
            }
        }
    }

    /**
     * Sends a request and manages the response handling.
     *
     * @param <T> the response type
     * @param request the request to send
     * @param response the response object to populate
     * @param params additional parameters for the request

        mockProcessHelper.setThrowException(new InterruptedException("Interrupted"));

        try {
            suggestJob.executeSuggestCreator();
            // In test environment, exception handling may vary
        } catch (JobProcessingException e) {
            assertTrue(e.getMessage().contains("SuggestCreator Process terminated"));
        } catch (Exception e) {

        // Test with minimum timeout
        execJob.timeout(Integer.MIN_VALUE);
        assertEquals(Integer.MIN_VALUE, execJob.timeout);
    }

    // Test exception handling in execute
    public void test_execute_withException() {
        execJob.setThrowException(true);

        try {
            execJob.execute();
            fail("Should throw RuntimeException");