UrlQueueImpl<Long> queue = new UrlQueueImpl<>();

        queue.setDepth(0);
        assertEquals(Integer.valueOf(0), queue.getDepth());

        queue.setDepth(5);
        assertEquals(Integer.valueOf(5), queue.getDepth());

        queue.setDepth(null);
        assertNull(queue.getDepth());
    }

    public void test_lastModifiedGetterSetter() {

                if ((maxDepth != -1 && crawlRequest.getDepth() > maxDepth) || processedUrls.contains(crawlRequest.getUrl())) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Skipping crawl request for url='{}' at depth={} (maxDepth={}, alreadyProcessed={})",
                                crawlRequest.getUrl(), crawlRequest.getDepth(), maxDepth, processedUrls.contains(crawlRequest.getUrl()));

            crawlerContext.setNumOfThread(numOfThread);

            // depth
            final int depth = webConfig.getDepth() != null ? webConfig.getDepth() : -1;
            crawlerContext.setMaxDepth(depth);

            // max count
            final long maxCount = webConfig.getMaxAccessCount() != null ? webConfig.getMaxAccessCount() : maxAccessCount;

        assertEquals(sessionId, added.getSessionId());
        assertEquals(url, added.getUrl());
        assertEquals(Constants.GET_METHOD, added.getMethod());
        assertEquals(Integer.valueOf(0), added.getDepth());
        assertNotNull(added.getCreateTime());
    }

    public void test_insert() {
        // Setup
        String sessionId = "session123";
        UrlQueueImpl<Long> urlQueue = new UrlQueueImpl<>();

                "createdTime");
        setupEpg(_epgMap, et -> ((FileConfig) et).getDepth(), (et, vl) -> ((FileConfig) et).setDepth(DfTypeUtil.toInteger(vl)), "depth");
        setupEpg(_epgMap, et -> ((FileConfig) et).getDescription(), (et, vl) -> ((FileConfig) et).setDescription(DfTypeUtil.toString(vl)),
                "description");

        setupEpg(_epgMap, et -> ((WebConfig) et).getCreatedTime(), (et, vl) -> ((WebConfig) et).setCreatedTime(DfTypeUtil.toLong(vl)),
                "createdTime");
        setupEpg(_epgMap, et -> ((WebConfig) et).getDepth(), (et, vl) -> ((WebConfig) et).setDepth(DfTypeUtil.toInteger(vl)), "depth");
        setupEpg(_epgMap, et -> ((WebConfig) et).getDescription(), (et, vl) -> ((WebConfig) et).setDescription(DfTypeUtil.toString(vl)),
                "description");

            try {
                storeChildUrls(childUrlSet.stream().filter(rd -> StringUtil.isNotBlank(rd.getUrl())).collect(Collectors.toSet()),
                        urlQueue.getUrl(), urlQueue.getDepth() != null ? urlQueue.getDepth() + 1 : 1);
            } catch (final Throwable t) {
                if (!ComponentUtil.available()) {
                    throw new ContainerNotAvailableException(t);
                }

            @Override
            public void setParentUrl(String parentUrl) {
            }

            @Override
            public Integer getDepth() {
                return null;
            }

            @Override
            public void setDepth(Integer depth) {
            }

            @Override
            public Long getLastModified() {
                return null;
            }

        urlQueue.setDepth(1);
        urlQueue.setMethod("GET");
        urlQueue.setSessionId("id1");
        urlQueue.setUrl("http://www.id1.com/");

        urlQueueService.insert(urlQueue);

        final OpenSearchUrlQueue urlQueue2 = new OpenSearchUrlQueue();
        urlQueue2.setCreateTime(System.currentTimeMillis());
        urlQueue2.setDepth(1);
        urlQueue2.setMethod("GET");

     */
    public void test_isValid_validUrlQueue() throws Exception {
        final UrlQueue<?> urlQueue = new UrlQueueImpl<>();
        urlQueue.setUrl("http://example.com/");
        urlQueue.setDepth(1);

        when(urlFilter.match(anyString())).thenReturn(true);

        // Use reflection to access protected method