assertMessageSignatureIsValid example

        $message = new Message(
            (new Headers())
                ->addDateHeader('Date', new \DateTimeImmutable('2019-04-07 10:36:30', new \DateTimeZone('Europe/Paris')))
                ->addMailboxListHeader('From', ['fabien@symfony.com']),
            new TextPart('content')
        );

        $signer = new SMimeSigner($this->samplesDir.'sign.crt', $this->samplesDir.'sign.key');
        $signedMessage = $signer->sign($message);

        $this->assertMessageSignatureIsValid($signedMessage, $message);
    }

    public function testSignEncryptedMessage()
    {
        $message = (new Email())
            ->date(new \DateTimeImmutable('2019-04-07 10:36:30', new \DateTimeZone('Europe/Paris')))
            ->to('fabien@symfony.com')
            ->subject('Testing')
            ->from('noreply@example.com')
            ->text('El Barto was not here');