public function testGetHash()
{
$queryBuilder = $this->collection->find()->field('_id')->field('ineterests')->sort(array('age' => 1, 'gender' => -1))->limit(10, 20)->whereAll('interests', array('php', 'snowboard'));
$this->assertEquals('508cc93b371c222c53ae90989d95caae', $queryBuilder->getHash());
}