}
        final String value = LaFunctions.h(title);
        if (!fessConfig.isResponseHighlightContentTitleEnabled()) {
            return value;
        }
        return getQuerySet().map(querySet -> {
            final String pattern = querySet.stream().map(LaFunctions::h).map(Pattern::quote).collect(Collectors.joining("|"));
            if (StringUtil.isBlank(pattern)) {
                return null;

    public void test_getContentTitle() {
        final Set<String> querySet = new HashSet<>();
        ViewHelper viewHelper = new ViewHelper() {
            @Override
            protected OptionalThing<Set<String>> getQuerySet() {
                return OptionalThing.of(querySet);
            }
        };
        viewHelper.init();

        querySet.add("aaa");

        final Map<String, Object> document = new HashMap<>();