Sokil\Mongo\AggregatePipelinesTest::testUnwind PHP Method

    public function testUnwind()
    {
        // add documents
        $this->collection->batchInsert(array(array('subdoc' => array('key' => array(1, 2))), array('subdoc' => array('key' => array(4, 8)))));
        // create pipeline
        $pipeline = new Pipeline($this->collection);
        $pipeline->unwind('$subdoc.key');
        // get result
        $result = $pipeline->aggregate();
        $this->assertEquals(4, count($result));
        $this->assertEquals(1, $result[0]['subdoc']['key']);
        $this->assertEquals(2, $result[1]['subdoc']['key']);
        $this->assertEquals(4, $result[2]['subdoc']['key']);
        $this->assertEquals(8, $result[3]['subdoc']['key']);
        $this->assertTrue((string) $result[0]['_id'] === (string) $result[1]['_id']);
        $this->assertTrue((string) $result[2]['_id'] === (string) $result[3]['_id']);
        $this->assertTrue((string) $result[0]['_id'] !== (string) $result[2]['_id']);
    }