Doctrine\MongoDB\Aggregation\Stage\Out::getExpression PHP Méthode

    public function getExpression()
    {
        return ['$out' => $this->collection];
    }

 public function testOutStage()
 {
     $outStage = new Out($this->getTestAggregationBuilder(), 'someCollection');
     $this->assertSame(array('$out' => 'someCollection'), $outStage->getExpression());
 }