DkimSigner example

public function testSign(int $time, string $bodyCanon, string $headerCanon, string $header)
    {
        ClockMock::withClockMock($time);

        $message = (new Email())
            ->from(new Address('fabien@testdkim.symfony.net', 'Fabién'))
            ->to('fabien.potencier@gmail.com')
            ->subject('Tést')
            ->text("Some body \n \n This \r\n\r\n is really interesting and at the same time very long line to see if everything works as expected, does it?\r\n\r\n\r\n\r\n")
            ->date(new \DateTimeImmutable('2005-10-15', new \DateTimeZone('Europe/Paris')));

        $signer = new DkimSigner(self::$pk, 'testdkim.symfony.net', 'sf');
        $signedMessage = $signer->sign($message, [
            'header_canon' => $headerCanon,
            'body_canon' => $bodyCanon,
            'headers_to_ignore' => ['Message-ID'],
        ]);

        $this->assertSame($message->getBody()->toString(), $signedMessage->getBody()->toString());
        $this->assertTrue($signedMessage->getHeaders()->has('DKIM-Signature'));
        $this->assertEquals($header, $signedMessage->getHeaders()->get('DKIM-Signature')->getBody());
    }