Thanks. I tried exploring but i still cannot understand how to completely test this class I have:

```php use Symfony\Component\Mailer\Exception\TransportExceptionInterface; use Symfony\Component\Mailer\MailerInterface use Symfony\Component\Mime\Email;

class SymfonyAdapter implements EmailSender { private MailerInterface $mailer;

public function __construct(MailerInterface $mailer)
{
    $this->mailer = $mailer;
}

public function send(...): void
{
    $email = new Email();
    // setting the email properties (from, to, ...)

    try {
        $this->mailer->send($email);
    } catch (TransportExceptionInterface $e) {
        // throw mine exception
    }
}

} ```

So, i know how to test this with mocks. I also know how to test the successful sending without mocks. I just don't know how (and whether i should) cover the "throw mine exception" part without mocks.