assertEquals("default", result4);
    }

    // Test joinCrawlerThread private method via reflection
    @Test
    public void test_joinCrawlerThread() throws Exception {
        Method method = Crawler.class.getDeclaredMethod("joinCrawlerThread", Thread.class);
        method.setAccessible(true);

        // Test with null thread
        try {

                }, DATA_CRAWLING_PROCESS);
                dataCrawlerThread.start();
            }

            joinCrawlerThread(webFsCrawlerThread);
            joinCrawlerThread(dataCrawlerThread);

            if (logger.isInfoEnabled()) {
                logger.info("Finished Crawler.");
            }

            return Constants.EXIT_OK;