Doctrine\ODM\MongoDB\Tests\Aggregation\Stage\LookupTest::testLookupStageWithClassName PHP Method

    public function testLookupStageWithClassName()
    {
        $this->requireMongoDB32();
        $this->insertTestData();
        $builder = $this->dm->createAggregationBuilder(\Documents\SimpleReferenceUser::class);
        $builder->lookup(\Documents\User::class)->localField('userId')->foreignField('_id')->alias('user');
        $expectedPipeline = [['$lookup' => ['from' => 'users', 'localField' => 'userId', 'foreignField' => '_id', 'as' => 'user']]];
        $this->assertEquals($expectedPipeline, $builder->getPipeline());
        $result = $builder->execute()->toArray();
        $this->assertCount(1, $result);
        $this->assertCount(1, $result[0]['user']);
        $this->assertSame('alcaeus', $result[0]['user'][0]['username']);
    }