testData.add(createRelatedQuery("common", new String[] { "host2_query1", "host2_query2" }, "host2"));
        testData.add(createRelatedQuery("common", new String[] { "default_query1", "default_query2" }, ""));
        mockBhv.setTestData(testData);

        relatedQueryHelper.load();

        // Test default virtual host (empty string)
        virtualHostHelper = new VirtualHostHelper() {

            final DefaultQueryBuilderFunction builder) {
        final DefaultQueryBuilder defaultQuery = createDefaultQueryBuilder();
        defaultQuery.add(builder.apply(fessConfig.getIndexFieldTitle(), fessConfig.getQueryBoostTitleAsDecimal().floatValue()));
        defaultQuery.add(builder.apply(fessConfig.getIndexFieldContent(), fessConfig.getQueryBoostContentAsDecimal().floatValue()));

        final DefaultQueryBuilder defaultQuery =
                buildDefaultQueryBuilder(fessConfig, context, (f, b) -> buildMatchPhraseQuery(f, text).boost(b * boost));
        final Integer fuzzyMinLength = fessConfig.getQueryBoostFuzzyMinLengthAsInteger();
        if (fuzzyMinLength >= 0 && text.length() >= fuzzyMinLength) {
            defaultQuery.add(QueryBuilders.fuzzyQuery(fessConfig.getIndexFieldTitle(), text)