}
        }

        final int threadCount = 10;
        final Thread[] threads = new Thread[threadCount];
        final Exception[] exceptions = new Exception[threadCount];
        final int[] sizes = new int[threadCount];
        final boolean[][] containsResults = new boolean[threadCount][10];

        // Multiple threads read from deleteUrlList
        for (int i = 0; i < threadCount; i++) {

        final List<Map<String, String>> capturedLogs = new ArrayList<>();
        final ActivityHelper spyActivityHelper = createSpyActivityHelper(capturedLogs);

        final TestActionRuntime testRuntime = new TestActionRuntime("/admin/user/");
        final FessAdminAction action =
                createGodHandAction(spyActivityHelper, OptionalThing.of(new FessUserBean(new TestUser("admin", new String[0]))), true);

     * Returns the new reading.
     *
     * @return The new reading.
     */
    public String getNewReading() {
        return newReading;
    }

    /**
     * Sets the new reading.
     *
     * @param newReading The new reading.
     */
    public void setNewReading(final String newReading) {
        this.newReading = newReading;
    }

    /**
     * Returns the new part of speech.
     *

     */
    protected void reload(final ProtwordsUpdater updater, final InputStream in) {
        final List<ProtwordsItem> itemList = new ArrayList<>();
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(in, Constants.UTF_8))) {
            long id = 0;
            String line = null;
            while ((line = reader.readLine()) != null) {

    public void test_isValidUploadPath_validSubdirectory() throws Exception {
        // Create test directory structure with subdirectory
        File baseDir = new File(tempDir.toFile(), "images");
        File subDir = new File(baseDir, "icons");
        subDir.mkdirs();
        File validFile = new File(subDir, "icon.png");

        Boolean result = invokeIsValidUploadPath(validFile, baseDir);

        final AtomicBoolean heartbeatCalled = new AtomicBoolean(false);
        final AtomicBoolean fetchCalled = new AtomicBoolean(false);
        final AtomicBoolean cleanupCalled = new AtomicBoolean(false);
        final CoordinatorHelper helper = new CoordinatorHelper() {
            @Override
            public void sendHeartbeat() {

        UserRoleLoginException exception = new UserRoleLoginException(RootAction.class);

        // Create multiple threads to test synchronized method
        Thread thread1 = new Thread(() -> {
            Throwable result = exception.fillInStackTrace();
            assertNull(result);
        });

        Thread thread2 = new Thread(() -> {
            Throwable result = exception.fillInStackTrace();

        final Pattern parsePattern = Pattern.compile("(.*?)\\s*+=>\\s*+(.*?)\\s*+$");
        final List<StemmerOverrideItem> itemList = new ArrayList<>();
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(in, Constants.UTF_8))) {
            long id = 0;
            String line = null;
            while ((line = reader.readLine()) != null) {

        indexUpdater = new IndexUpdater();

        // Initialize mocks/test doubles
        systemHelper = new TestSystemHelper();
        indexingHelper = new TestIndexingHelper();
        intervalControlHelper = new TestIntervalControlHelper();
        searchLogHelper = new TestSearchLogHelper();
        languageHelper = new TestLanguageHelper();
        fessConfig = new TestFessConfig();

        }
    }

    // Test add multiple engines
    @Test
    public void test_add_multipleEngines() {
        TestScriptEngine engine1 = new TestScriptEngine("engine1");
        TestScriptEngine engine2 = new TestScriptEngine("engine2");
        CustomScriptEngine customEngine = new CustomScriptEngine();

        scriptEngineFactory.add("engine1", engine1);
        scriptEngineFactory.add("engine2", engine2);