// Test that multiple calls to getUrl() return the same value
        String url = "http://example.com/test";
        String message = "Test message";
        Exception cause = new RuntimeException("Test cause");

        DataStoreCrawlingException exception = new DataStoreCrawlingException(url, message, cause);

        // Call getUrl() multiple times
        assertEquals(url, exception.getUrl());

                && isValidCanonicalUrl(responseData.getUrl(), canonicalUrl)) {
            final Set<RequestData> childUrlSet = new HashSet<>();
            childUrlSet.add(RequestDataBuilder.newRequestData().get().url(canonicalUrl).build());
            logger.info("Canonical URL redirect: from={}, to={}", responseData.getUrl(), canonicalUrl);

        assertEquals("plugin/repo3/fess-crawler-smbj/14.14.0/fess-crawler-smbj-14.14.0.jar", list.get(0).getUrl());
        assertEquals("fess-crawler-smbj", list.get(1).getName());
        assertEquals("14.15.0", list.get(1).getVersion());
        assertEquals("plugin/repo3/fess-crawler-smbj/14.15.0/fess-crawler-smbj-14.15.0.jar", list.get(1).getUrl());
    }

    @Test
    public void test_getArtifactFromFileName1() {

        urlList = fessXpathTransformer.convertChildUrlList(urlList);
        assertEquals(2, urlList.size());
        assertEquals("http://www.example.com", urlList.get(0).getUrl());
        assertEquals("http://www.test.com", urlList.get(1).getUrl());

        urlList.clear();
        urlList.add(RequestDataBuilder.newRequestData().get().url("feed://www.example.com").build());

        final ResponseData responseData = new ResponseData();

        responseData.setUrl("http://example.com/document.pdf");
        assertEquals("http://example.com/document.pdf", responseData.getUrl());

        responseData.setMimeType("application/pdf");
        assertEquals("application/pdf", responseData.getMimeType());

        responseData.setCharSet("UTF-8");

        assertEquals(1, result.size());

        RequestData requestData = result.iterator().next();
        assertEquals("http://example.com", requestData.getUrl());
    }

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

            return "test_session";
        }

        @Override
        public String getRuleId() {
            return "test_rule";
        }

        @Override
        public String getUrl() {
            return "http://test.example.com";
        }

        @Override
        public String getParentUrl() {
            return null;
        }

        @Override

            this.id = id;
            this.url = url;
        }

        @Override
        public String getId() {
            return id;
        }

        @Override
        public String getUrl() {
            return url;
        }

        @Override
        public String getMetaData() {
            return null;
        }

        @Override
        public String getEncoding() {

     * @throws PluginException if installation fails
     */
    protected void install(final Artifact artifact) {
        final String fileName = artifact.getFileName();
        final String url = artifact.getUrl();
        if (StringUtil.isBlank(url)) {
            throw new PluginException("url is blank: " + artifact.getName());
        }
        if (url.startsWith("http:") || url.startsWith("https:")) {

            return msg.getContent();
        }
        final String refs = sources.stream().map(s -> {
            final String title = s.getTitle();
            final String url = s.getUrl();
            if (title != null && !title.isEmpty() && url != null && !url.isEmpty()) {
                return title + " (" + url + ")";
            } else if (title != null && !title.isEmpty()) {