How to access a private service in Symfony 5.3 phpunit tests?

Question

I want to define a functional testcase for my phpunit-tests for my Symfony 5.3 application which requires the private service security.password_hasher from the container.

I get the following execption

1. App\Tests\Functional\SiteResourceTest::testCreateSite Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: The security.password_hasher service or alias has been removed or inlined when the container was compiled. You should either make it public, or stop using the container directly and use dependency injection instead.

I followed the instructions from the documentation about retrieving services in the test

What am i doing wrong? How can i fix this?

class CustomApiTestCase extends ApiTestCase
{
    protected UserPasswordHasher $passwordHasher;

    protected function setUp(): void
    {
        // (1) boot the Symfony kernel
        self::bootKernel();

        // (2) use static::getContainer() to access the service container
        $container = static::getContainer();

        // (3) run some service & test the result
        $this->passwordHasher = $container->get('security.password_hasher');
    }

    protected function createUser(
        string $email,
        string $password,
    ): User {
        $user = new User();
        $user->setEmail($email);

        $encoded = $this->passwordHasher->hash($password);
        $user->setPassword($encoded);

        $em = self::getContainer()->get('doctrine')->getManager();
        $em->persist($user);
        $em->flush();

        return $user;
    }


    protected function createUserAndLogIn(Client $client, string $email, string $password): User
    {
        $user = $this->createUser($email, $password);
        $this->logIn($client, $email, $password);

        return $user;
    }



    protected function logIn(Client $client, string $email, string $password)
    {
        $client->request('POST', '/login', [
            'headers' => ['Content-Type' => 'application/json'],
            'json' => [
                'email' => $email,
                'password' => $password
            ],
        ]);
        $this->assertResponseStatusCodeSame(204);
    }
}

Answer 1

I had to rewrite the complete definition of the service to prevent the following error during cache compilation:

The definition for "security.user_password_hasher" has no class. If you intend to inject this service dynamically at runtime, please mark it as synthetic=true. If this is an abstract definition solely used by child definitions, please add abstract=true, otherwise specify a class to get rid of this error.

services.yaml

security.user_password_hasher:
    class: Symfony\Component\PasswordHasher\Hasher\UserPasswordHasher
    public: true
    arguments:
      [ '@security.password_hasher_factory' ]