assertFalse(svgMimetype.matches(doubleBackslash));

        // Pattern with no backslash (13 chars): should NOT match
        String noBackslash = "image/svg+xml";
        assertEquals("No backslash pattern should be 13 chars", 13, noBackslash.length());
        assertFalse(svgMimetype.matches(noBackslash));
    }

    @Test

        Thread writerThread = new Thread(() -> {
            try {
                startLatch.await(); // Wait for start signal
                // Set alive to false very early - no delay
                dataStore.alive = false;
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        });
        writerThread.start();

        return new RelevanceEvaluationResult(relevantDocIds, relevantIndexes, hasRelevant);
    }

    /**
     * Creates a result with no relevant documents found.
     *
     * @return evaluation result with no relevant documents
     */
    public static RelevanceEvaluationResult noRelevantResults() {

                props.setProperty("bool.true", "true");
                props.setProperty("bool.false", "false");
                props.setProperty("bool.yes", "yes");
                props.setProperty("bool.no", "no");
                props.setProperty("bool.on", "on");
                props.setProperty("bool.off", "off");
                props.setProperty("bool.1", "1");
                props.setProperty("bool.0", "0");

            }
        }

        // An empty file should return no items
        assertEquals("Empty file should have no items", 0, result.size());
        assertEquals("Empty file should have no records", 0, result.getAllRecordCount());
        assertEquals("Empty file should have no pages", 0, result.getAllPageCount());
    }

    // Test selectList method with valid data
    @Test

        // Verify email addresses are correctly formatted (no double @)
        String technicalEmail = (String) defaultSettings.get("onelogin.saml2.contacts.technical.email_address");
        String supportEmail = (String) defaultSettings.get("onelogin.saml2.contacts.support.email_address");

        assertNotNull(technicalEmail);
        assertNotNull(supportEmail);

        // Verify no double @ signs

        docMap.put("_id", "docid1");
        docMap.put("url", "http://example.com");

        boolean result = thumbnailManager.offer(docMap);
        assertTrue(result);
    }

    // Test offer with no matching generator
    @Test
    public void test_offer_noMatchingGenerator() {
        TestThumbnailGenerator generator = new TestThumbnailGenerator();
        generator.available = true;
        generator.target = false;

            }

            @Override
            public long getExecuteTime() {
                return execTime.get();
            }

            @Override
            public void commit() {
                // No-op for test
            }
        };

        // Test initial state
        assertEquals(0L, callback.getDocumentSize());
        assertEquals(0L, callback.getExecuteTime());

        // Test store method

        ComponentUtil.setFessConfig(mockConfig);

        // Setup mock request manager with no value
        RequestManager mockRequestManager = createMockRequestManager(null);

        // Execute
        OptionalThing<Locale> result = provider.findBusinessLocale(null, mockRequestManager);

        // Verify - should return empty when no parameter value
        assertFalse(result.isPresent());
    }

    }

    /**
     * Gets the delay time in milliseconds when there are no URLs in the queue.
     *
     * @return the delay time in milliseconds when no URLs are available
     */
    public long getDelayMillisAtNoUrlInQueue() {
        return delayMillisAtNoUrlInQueue;
    }

    /**
     * Sets the delay time in milliseconds when there are no URLs in the queue.
     *