public StringDataList createDataList() {
        Request request = new Request();
        StringDataList dataList = new StringDataList(request);
        dataList.add(new StringDataItem(request, "l1"));
        StringDataList secondLevel = new StringDataList(request);
        secondLevel.add(new StringDataItem(request, "l11"));
        secondLevel.add(new StringDataItem(request, "l12"));
        dataList.add(secondLevel);
        return dataList;
    }
Validate we get a full response with a malformed response structure.
container-core/src/test/java/com/yahoo/processing/rendering/AsynchronousSectionedRendererTest.java