Date expires = crawlingInfoHelper.getDocumentExpires(null);
        assertNotNull(expires); // Returns documentExpires when config is null
        assertEquals(currentTime + 1000, expires.getTime());

        // Test when documentExpires is set but config is provided (but config has no timeToLive)
        crawlingInfoHelper.documentExpires = currentTime + 5000;

        final Date currentTime = systemHelper.getCurrentTime();
        assertNotNull(currentTime);
        final long now = System.currentTimeMillis();
        assertTrue(Math.abs(currentTime.getTime() - now) < 1000);
    }

    @Test
    public void test_getCurrentTimeAsLong() {
        final long currentTime = systemHelper.getCurrentTimeAsLong();
        final long now = System.currentTimeMillis();