// Test with null
        result = crawlJob.dataConfigIds(null);
        assertNull(crawlJob.dataConfigIds);
        assertSame(crawlJob, result);
    }

    // Test hotThread setter
    public void test_hotThread() {
        int testInterval = 60;
        CrawlJob result = crawlJob.hotThread(testInterval);
        assertEquals(testInterval, crawlJob.hotThreadInterval);
        assertSame(crawlJob, result);