crawlerContext.setIntervalController(null);
        assertNull(crawlerContext.getIntervalController());
    }

    /**
     * Test robotsTxtUrlSet getter and setter
     */
    public void test_robotsTxtUrlSet() {
        Set<String> urlSet = crawlerContext.getRobotsTxtUrlSet();
        assertNotNull(urlSet);
        assertTrue(urlSet instanceof LruHashSet);
        assertTrue(urlSet.isEmpty());