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() {

        } catch (final InterruptedException e) {
            logger.warn("Interrupted index update.", e);
        }

        crawlingInfoHelper.putToInfoMap(Constants.WEB_FS_INDEX_EXEC_TIME, Long.toString(indexUpdater.getExecuteTime()));
        crawlingInfoHelper.putToInfoMap(Constants.WEB_FS_INDEX_SIZE, Long.toString(indexUpdater.getDocumentSize()));

        if (systemHelper.isForceStop()) {
            return;
        }