assertNull(result, "getAnchorSet should return null for null input");
    }

    /**
     * Test getAnchorSet with single string
     */
    @Test
    public void test_getAnchorSet_withSingleString() {
        FessCrawlerThread crawlerThread = new FessCrawlerThread();

        Set<RequestData> result = crawlerThread.getAnchorSet("http://example.com");