Description

Actually, PHPStan throws errors because it cannot resolve the correct type from following code:

use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
use Symfony\Component\DependencyInjection\Container;

class FooTest extends KernelTestCase {
    private Container $container;

    protected function setUp(): void
    {
        $this->container = self::getContainer();
    }

    public function testBar() {
        $serializer = $this->container->get('serializer');

        // ...
    }
}

The previous code with fail with PHPStan errors like (Service "serializer" is private.).

After digging up in the getContainer method, I saw that the returned container was TestContainer and not a Container as indicated in the return type.

If I change the code to this:

// ...
use Symfony\Bundle\FrameworkBundle\Test\TestContainer;

class FooTest extends KernelTestCase {
    private TestContainer $container;

    // ...
}

The errors are gone but I do have other warnings (not from PHPStan though) indicating that the TestContainer is marked as internal.

WDYT about removing the @internal phpdoc annotation and specifying a better typehint @nicolas-grekas ?

Example

No response