public StringDataList createDataListWithReusedSublist() {
        Request request = new Request();
        StringDataList dataList = new StringDataList(request);

        StringDataList group1 = new StringDataList(request);
        dataList.add(group1);

        StringDataList group2 = new StringDataList(request);
        group1.add(group2);

        dataList.add(group2); // Bug: This should not be added twice
        return dataList;
    }
Validate we get a full response with a malformed response structure.
container-core/src/test/java/com/yahoo/processing/rendering/AsynchronousSectionedRendererTest.java