public function testGroupByAggregate()
 {
     $group_by = new Aggregate('count', new Field('user'), true, 'c');
     $field = new Field('very_long_identifier', 0, 'url');
     $q = new SelectQuery('test');
     $q->setSelect(array($group_by, $field));
     $q->setGroupby(array($group_by));
     $q->setOrderBy(array($field));
     $this->assertEquals('SELECT COUNT(DISTINCT `t0`.`user`) AS `c`, `t0`.`very_long_identifier` AS `url` FROM `test` AS `t0` GROUP BY `c` ORDER BY `url` ASC', $q->sql());
 }