assertTrue(keywords.isEmpty());
    }

    // Test addHighlightedQuery with null highlightedQuerySet
    @Test
    public void test_addHighlightedQuery_nullSet() {
        queryContext = new QueryContext("test", false);
        queryContext.addHighlightedQuery("text");
        // Should not throw exception
    }

    // Test addHighlightedQuery with valid set
    @Test

        // Manual implementation (for comparison)
        QueryBuilder result2;
        context2.addFieldLog("title", "test");
        context2.addHighlightedQuery("test");
        if (Constants.DEFAULT_FIELD.equals("title")) {
            result2 = queryCommand.buildDefaultQueryBuilder(fessConfig, context2,

            final float boost, final String field, final String text) {
        context.addFieldLog(field, text);
        context.addHighlightedQuery(text);
        return buildMatchPhraseQuery(field, text).boost(boost);
    }

    /**
     * Converts a term query to a keyword-based exact term query.
     *

            final String text, final float boost, final DefaultQueryBuilderFunction defaultBuilder, final FieldQueryBuilder fieldBuilder) {

        context.addFieldLog(field, text);
        context.addHighlightedQuery(text);

        if (Constants.DEFAULT_FIELD.equals(field)) {
            return buildDefaultQueryBuilder(fessConfig, context, defaultBuilder);
        }

        if (isSearchField(field)) {