// Test convertBooleanQuery with empty BooleanQuery
    public void test_convertBooleanQuery_withEmptyQuery() {
        BooleanQuery.Builder boolQueryBuilder = new BooleanQuery.Builder();
        BooleanQuery booleanQuery = boolQueryBuilder.build();

        QueryContext context = new QueryContext("test", false);
        QueryBuilder result = booleanQueryCommand.convertBooleanQuery(context, booleanQuery, 1.0f);

        assertNull(result);

    @Override
    protected String getQueryClassName() {
        return BooleanQuery.class.getSimpleName();
    }

    @Override
    public QueryBuilder execute(final QueryContext context, final Query query, final float boost) {
        if (query instanceof final BooleanQuery booleanQuery) {
            if (logger.isDebugEnabled()) {
                logger.debug("{}:{}", query, boost);
            }

        // Test executing BoostQuery with a BooleanQuery inside
        BooleanQuery.Builder boolBuilder = new BooleanQuery.Builder();
        boolBuilder.add(new TermQuery(new Term("field1", "value1")), BooleanClause.Occur.MUST);
        boolBuilder.add(new TermQuery(new Term("field2", "value2")), BooleanClause.Occur.SHOULD);
        BooleanQuery boolQuery = boolBuilder.build();

        query = queryParser.createDefaultFilterChain().parse("fess codelibs");
        assertEquals(BooleanQuery.class, query.getClass());
        List<BooleanClause> clauses = ((BooleanQuery) query).clauses();
        assertEquals(TermQuery.class, clauses.get(0).query().getClass());
        assertEquals("_default:fess", clauses.get(0).query().toString());