public function testMergeGroupBy()
{
$this->queryBuilder->groupBy('id');
$qb = new SelectQueryBuilder();
$qb->groupBy('score', SelectQueryBuilder::ASC);
$this->queryBuilder->mergeGroupBy($qb);
$expected = array(array('column' => 'id', 'order' => NULL), array('column' => 'score', 'order' => SelectQueryBuilder::ASC));
$this->assertEquals($expected, $this->queryBuilder->getGroupByParts());
}