public function testMergeSelect()
 {
     $this->queryBuilder->select('id');
     $this->queryBuilder->select('count(*)', 'nb');
     $qb = new SelectQueryBuilder();
     $qb->select('title');
     $qb->addOption('DISTINCT');
     $this->queryBuilder->mergeSelect($qb);
     $expected = array('count(*)' => 'nb', 'id' => null, 'title' => null);
     $this->assertEquals($expected, $this->queryBuilder->getSelectParts());
     $this->assertEquals(array('DISTINCT'), $this->queryBuilder->getOptions());
 }