Sokil\Mongo\CollectionTest::testGetResultSet PHP Method

    public function testGetResultSet()
    {
        $document1Id = $this->collection->createDocument(array('param' => 1))->save()->getId();
        $document2Id = $this->collection->createDocument(array('param' => 2))->save()->getId();
        $document3Id = $this->collection->createDocument(array('param' => 3))->save()->getId();
        $document4Id = $this->collection->createDocument(array('param' => 4))->save()->getId();
        $resultSet = $this->collection->find()->getResultSet();
        $this->assertInstanceOf('\\Sokil\\Mongo\\ResultSet', $resultSet);
        $filtered = $resultSet->filter(function ($item) {
            return $item->param % 2;
        })->keys();
        $this->assertEquals(array($document1Id, $document3Id), $filtered);
    }