Integration doctrine to codeigniter 4

I have installed doctrine with composer and added Doctrine.php to libraries using tutorial on next link
codeigniter and doctrine

and I try this:

PHP Code:

<?php namespace App\Controllers;

use CodeIgniter\Controller;
use App\Libraries\Doctrine;

use Doctrine\ORM\Query\ResultSetMapping;
use Doctrine\ORM\EntityManager;
use Doctrine\ORM\Tools\Setup;

class Home extends Controller {

public function test {

            $rsm = new ResultSetMapping();
            
            
            $query = $entityManager->createNativeQuery('SELECT * FROM test', $rsm);
            
            
            $users = $query->getResult();
            print_r($users);

       }
} 


Autoload

PHP Code:

public $classmap = [
            'Test' => APPPATH . 'libraries/Test.php',
            'Twig' => APPPATH . 'libraries/Twig.php',
            'Doctrine' => APPPATH . 'libraries/Doctrine.php',
        ]; 


and I get error: Undefined variable: entityManager

This is only the test for me.