assertEquals(message, exception.getMessage());
        assertEquals(cause, exception.getCause());
    }

    @Test
    public void test_constructor_withCause() {
        // Test constructor with cause only
        Throwable cause = new IllegalArgumentException("Cause exception");
        FessSystemException exception = new FessSystemException(cause);

        final List<PathMapping> pathMappingList = new ArrayList<PathMapping>();

        final PathMapping pathMapping1 = new PathMapping();
        pathMapping1.setRegex("file:///home/");
        pathMapping1.setReplacement("http://localhost/");
        pathMappingList.add(pathMapping1);

        final PathMapping pathMapping2 = new PathMapping();
        pathMapping2.setRegex("http://localhost/");

        super.setUp(testInfo);
        crawler = new Crawler();

        // Initialize mock components
        searchEngineClient = new SearchEngineClient() {
            // Mock implementation
        };
        crawler.searchEngineClient = searchEngineClient;

        webFsIndexHelper = new WebFsIndexHelper() {
            @Override

    }

    @Test
    public void test_addSourceWithNullSources() {
        final ChatMessage message = new ChatMessage();
        message.setSources(null);

        final ChatSource source = new ChatSource();
        source.setTitle("New Source");

        message.addSource(source);

        assertNotNull(message.getSources());
        assertEquals(1, message.getSources().size());

        DictionaryExpiredException original = new DictionaryExpiredException();

        // Serialize
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(original);
        oos.close();

        // Deserialize
        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

        ExceptionScoreBooster booster2 = new ExceptionScoreBooster();
        TestScoreBooster booster3 = new TestScoreBooster(300L);

        scoreUpdater.addScoreBooster(booster1);
        scoreUpdater.addScoreBooster(booster2);
        scoreUpdater.addScoreBooster(booster3);

        String result = scoreUpdater.execute();
        assertTrue(result.contains("TestScoreBooster : 100"));

        PluginException exception = new PluginException(longMessage);

        assertNotNull(exception);
        assertEquals(longMessage, exception.getMessage());
    }

    @Test
    public void test_multiLevelExceptionChain() {
        // Test multi-level exception chain
        Throwable level3 = new NullPointerException("Null value");
        Throwable level2 = new IllegalStateException("Invalid state", level3);

        LogNotificationHelper helper = new LogNotificationHelper();
        int numThreads = 8;
        int eventsPerThread = 200;
        ExecutorService executor = Executors.newFixedThreadPool(numThreads);
        CountDownLatch startLatch = new CountDownLatch(1);
        CountDownLatch doneLatch = new CountDownLatch(numThreads);
        AtomicInteger totalDrained = new AtomicInteger(0);

    public void test_isAvailable() {
        // Test default implementation
        generator = new TestThumbnailGenerator();
        assertTrue(generator.isAvailable());
    }

    @Test
    public void test_isTarget() {
        // Test isTarget method
        generator = new TestThumbnailGenerator();
        Map<String, Object> docMap = new HashMap<>();

        // Note: isTarget requires FessConfig which needs container

        TestFessTransformer transformer = new TestFessTransformer();
        Map<String, Object> dataMap = new HashMap<>();

        // Add a List as initial value
        List<String> initialList = new ArrayList<>();
        initialList.add("item1");
        initialList.add("item2");
        dataMap.put("items", initialList);

        // Add a new value