Dependency Injection with Fixtures - symfony

Question

I am building a web application using Symfony 4. I am trying to load fixtures from my functional tests. I have created a fixture class:
<?php
namespace App\DataFixtures;
use App\Entity\User;
use Doctrine\Bundle\FixturesBundle\Fixture;
use Doctrine\Common\Persistence\ObjectManager;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
class TestFixtures extends Fixture
{
private $encoder;
public function __construct(UserPasswordEncoderInterface $encoder)
{
$this->encoder = $encoder;
}
public function load(ObjectManager $em)
{
$user = new User();
$user->setUsername('user#gamil.com');
$user->setIsActive(true);
$user->setEmail('user#gmail.com');
$user->setFirstName('John');
$user->setLastName('Doe');
$user->setSchool($school);
$user->setRoles(['ROLE_USER']);
$password = $this->encoder->encodePassword($user, 'pass1234');
$user->setPassword($password);
$em->persist($user);
$em->flush();
return $user;
}
}
I have configured services_test.yaml to pass the service to the fixture:
services:
_defaults:
public: true
App\DataFixtures\TestFixtures:
arguments: ['#security.password_encoder']
However, when I try to run my tests I get the following error:
ArgumentCountError: Too few arguments to function App\DataFixtures\TestFixtures::__construct(), 0 passed in /Development/app/src/Test/ApiTestCase.php on line 38 and exactly 1 expected
This is the function from my test case:
protected function setUp()
{
$this->client = self::$staticClient;
$this->purgeDatabase();
$em = $this->getEntityManager();
$fixture = new TestFixtures();
$fixture->load($em);
}
Thanks in advance for any advice offered on this...

Answer 1

You are instantiating a class:
$fixture = new TestFixtures(); whereas you need it as a service.
You need to either, do this $fixture = new TestFixtures(encoder);
where encoder is either an instantiated class or a mock of your encoder class, or, retrieve TestFixtures class from the client's container. I'm not entirely sure but try
$fixture = $this->client->getContainer()->get('App\DataFixtures\TestFixtures');