List<RequestData> urlList = new ArrayList<>();

        urlList = fessXpathTransformer.convertChildUrlList(urlList);
        assertEquals(0, urlList.size());

        urlList.clear();
        urlList.add(RequestDataBuilder.newRequestData().get().url("http://www.example.com").build());
        urlList = fessXpathTransformer.convertChildUrlList(urlList);
        assertEquals(1, urlList.size());

                        responseData.getCharSet())) {
                    requestDataList.add(RequestDataBuilder.newRequestData().get().url(childUrl).build());
                }
                requestDataList = convertChildUrlList(requestDataList);
                resultData.addAllUrl(requestDataList);
            });

            resultData.addAllUrl(responseData.getChildUrlSet());