dama error test case

Name.php

<?php

namespace App\Entity;

use Doctrine\ORM\Mapping\Id;
use Doctrine\ORM\Mapping\Column;
use Doctrine\ORM\Mapping\Entity;
use Doctrine\ORM\Mapping\GeneratedValue;

/** @Entity */
class Name
{
    public function __construct(string $name)
    {
        $this->name = $name;
    }

    /**
     * @Id
     * @Column(type="integer")
     * @GeneratedValue(strategy="AUTO")
     * @var int|null
     */
    protected $id;

    /**
     * @Column(type="string", length=255)
     * @var string
     */
    protected $name;
}

Test.php

<?php

namespace App\Tests;

use App\Entity\Name;
use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class Test extends WebTestCase
{
    private $em;

    protected function setUp(): void
    {
        static::$kernel = static::createKernel();
        static::$kernel->boot();
        $this->em = static::$kernel->getContainer()
            ->get('doctrine')
            ->getManager()
        ;
    }

    public function testError(): void
    {
        $client = static::createClient();
        $name = new Name('myname');
        $this->em->persist($name);
        $this->em->flush();
        $this->assertTrue(true);
    }
}