result = crawlJob.fileConfigIds(null);
        assertNull(crawlJob.fileConfigIds);
        assertSame(crawlJob, result);
    }

    // Test dataConfigIds setter
    public void test_dataConfigIds() {
        String[] testIds = { "data1", "data2", "data3", "data4" };
        CrawlJob result = crawlJob.dataConfigIds(testIds);
        assertArrayEquals(testIds, crawlJob.dataConfigIds);