Symfony version(s) affected

6.2.0

Description

Prior to 6.2.0, a call to self::getMailerMessage(0) would return the only message that was sent. After #47191 was merged, this returns a message from the QueueingMessageEvent, which means it hasn't been rendered via MessageListener yet.

Given this is just in tests, it's not a critical BC break, but it is a BC break. I'm not sure if getMailerMessage and getMailerMessages is really intended to be returning RawMessages from QueueingMessageEvent or not.

How to reproduce

Create templates/test_email.html.twig

<?php

use Symfony\Bridge\Twig\Mime\TemplatedEmail;
use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
use Symfony\Component\Mailer\MailerInterface;

class TestCase extends KernelTestCase
{
    public function testItSendsAnEmail(): void
    {
        $mailer = self::getContainer()->get(MailerInterface::class);

        $email = (new TemplatedEmail())
            ->from('from@example.com')
            ->to('user@example.com')
            ->htmlTemplate('test_email.html.twig');

        $mailer->send($email);

        $email = self::getMailerMessage(0);
        self::assertNotNull($email->getHtmlBody());
    }
}

Possible Solution

Change getMailerMessage and getMailerMessages to filter the events to remove QueueingMessageEvent.

Additional Context

No response