I have .env, .env.test, .env.test.local files in my project.
Variables are specified in .env.test:

APP_ENV=test
APP_DEBUG=1

However, when the test is running (WebTestCase), these variables don’t seem to exist.

class ErrorListener
{
    public function __construct(
        protected Environment $twig,
        protected ParameterBagInterface $parameters,
    )
    {
    }
    
    public function __invoke(ExceptionEvent $event): void
    {
        if ($this->parameters->get('APP_DEBUG')) { //APP_DEBUG is empty
            return;
        }
        ......
        ......
    }
}

And APP_ENV is empty too.
Why?