assertEquals(Integer.valueOf(0), crawlerContext.getActiveThreadCount());
    }

    /**
     * Test storeChildUrl with a valid URL.
     */
    @SuppressWarnings("unchecked")
    public void test_storeChildUrl_validUrl() throws Exception {
        when(urlFilter.match("http://example.com/child")).thenReturn(true);
        when(crawlerContainer.getComponent("urlQueue")).thenReturn(new UrlQueueImpl<>());