assertSame(crawlJob, result);
    }

    // Test documentExpires setter
    @Test
    public void test_documentExpires() {
        int testExpires = 30;
        CrawlJob result = crawlJob.documentExpires(testExpires);
        assertEquals(testExpires, crawlJob.documentExpires);
        assertSame(crawlJob, result);

        // Test with negative value
        result = crawlJob.documentExpires(-1);

        assertNull(expire);
    }

    // Test with different expire values
    @Test
    public void test_differentExpireValues() {
        int[] testExpires = { 0, 1, 60, 3600, 86400, Integer.MAX_VALUE };

        for (int expire : testExpires) {
            ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
                private static final long serialVersionUID = 1L;

                @Override