assertEquals("FacetInfo [field=[], query=[], size=null, minDocCount=null, sort=null, missing=null]", result);
    }

    // Test toString method with partially populated fields
    public void test_toString_partiallyPopulated() {
        facetInfo.field = new String[] { "field1" };
        facetInfo.size = 20;
        facetInfo.sort = "term.asc";

        String result = facetInfo.toString();