assertEquals("FacetInfo [field=[field1], query=null, size=20, minDocCount=null, sort=term.asc, missing=null]", result);
    }

    // Test field assignment
    @Test
    public void test_fieldAssignment() {
        String[] fields = new String[] { "field1", "field2", "field3" };
        facetInfo.field = fields;
        assertNotNull(facetInfo.field);
        assertEquals(3, facetInfo.field.length);