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
    public void test_setUncaughtExceptionHandler() {