}

    // Fast mock implementations to minimize overhead

    private static class FastMockIndexUpdateCallback implements IndexUpdateCallback {
        @Override
        public long getExecuteTime() {
            return 100L;
        }

        @Override
        public long getDocumentSize() {
            return 10L;
        }

        @Override
        public void commit() {

        assertEquals(0, indexUpdateCallback.getExecuteTime());

        systemHelper.processingTime = 100L;

        DataStoreParams paramMap = new DataStoreParams();
        Map<String, Object> dataMap = new HashMap<>();
        dataMap.put("url", "http://example.com/test");

        indexUpdateCallback.store(paramMap, dataMap);
        assertEquals(100L, indexUpdateCallback.getExecuteTime());

        indexUpdater.setCrawlerList(crawlerList);
        // Verify crawlerList was set (cannot access private field directly)

        // Test executeTime
        assertEquals(0L, indexUpdater.getExecuteTime());

        // Test documentSize
        assertEquals(0L, indexUpdater.getDocumentSize());
    }

    // Test setUncaughtExceptionHandler
    @Test
    public void test_setUncaughtExceptionHandler() {