propFile.deleteOnExit();
        try (FileOutputStream fos = new FileOutputStream(propFile)) {
            fos.write("fess.version=1.0.0".getBytes());
        }

        // Initialize SystemHelper
        SystemHelper systemHelper = new SystemHelper() {
            @Override
            protected void parseProjectProperties(final java.nio.file.Path propPath) {

    private IngestFactory ingestFactory;

    @Override
    public void setUp() throws Exception {
        super.setUp();

        // Initialize IndexUpdater
        indexUpdater = new IndexUpdater();

        // Initialize mocks/test doubles
        systemHelper = new TestSystemHelper();
        indexingHelper = new TestIndexingHelper();
        intervalControlHelper = new TestIntervalControlHelper();

        queryProcessor = ComponentUtil.getComponent("queryProcessor");
        queryFieldConfig = ComponentUtil.getComponent("queryFieldConfig");

        // Initialize and register PrefixQueryCommand
        queryCommand = new PrefixQueryCommand();
        queryCommand.register();
    }

    private void setNotAnalyzedFields(final String... fields) {

     * Uses ParamMap for automatic case format conversion between camelCase and snake_case.
     */
    protected final Map<String, Object> params;

    /**
     * Creates a new empty DataStoreParams instance.
     * Initializes the internal parameter map with a ParamMap wrapper.
     */
    public DataStoreParams() {
        params = new ParamMap<>(new HashMap<>());
    }

    /**

    /** Group name for search filtering. */
    public String name;

    /** Version number for optimistic locking. */
    public String versionNo;

    /**
     * Default constructor for GroupPager.
     * Initializes the pager with default values for pagination settings.
     */
    public GroupPager() {
        // Default constructor
    }

    /**

     * Used to retrieve paging and other configuration parameters.
     */
    @Resource
    protected FessConfig fessConfig;

    /**
     * Creates a new instance of DuplicateHostService.
     * This constructor initializes the service for managing duplicate host configuration operations
     * including CRUD operations and search functionality.
     */
    public DuplicateHostService() {
        super();
    }

    /**

        public static void shutdownAll() {
            throw new RuntimeException("Simulated exception during shutdown");
        }
    }

    // Test to verify the logger field is properly initialized
    public void test_loggerFieldInitialization() throws Exception {
        // Use reflection to access the private logger field
        Field loggerField = FessCurtainFinallyHook.class.getDeclaredField("logger");

            }
        };
        // Should not throw exception
        invokerAssistant.toBeDisposable(process);
    }

    // Test static constants are properly initialized
    public void test_staticConstants() {
        // Test DEFAULT_CLIENT_INVOKE_NAMES
        String[] clientNames = ImplementedInvokerAssistant.DEFAULT_CLIENT_INVOKE_NAMES;
        assertNotNull(clientNames);

    /** Cache for storing statistics objects keyed by crawler object identifiers. */
    protected LoadingCache<String, StatsObject> statsCache;

    /**
     * Initializes the crawler statistics helper.
     * Sets up the statistics logger and creates the cache for storing
     * statistics objects with the configured size and expiration settings.
     */
    @PostConstruct

     */
    protected final List<DataCrawlingThread> dataCrawlingThreadList = Collections.synchronizedList(new ArrayList<>());

    /**
     * Creates a new instance of DataIndexHelper.
     * This constructor initializes the helper for managing data crawling operations,
     * including thread pool management and session-based crawling coordination.
     */
    public DataIndexHelper() {