setMessageStream example

$transport = (new PostmarkApiTransport($user, $this->client, $this->dispatcher, $this->logger))->setHost($host)->setPort($port);
        }

        if ('postmark+smtp' === $scheme || 'postmark+smtps' === $scheme || 'postmark' === $scheme) {
            $transport = new PostmarkSmtpTransport($user, $this->dispatcher, $this->logger);
        }

        if (null !== $transport) {
            $messageStream = $dsn->getOption('message_stream');

            if (null !== $messageStream) {
                $transport->setMessageStream($messageStream);
            }

            return $transport;
        }

        throw new UnsupportedSchemeException($dsn, 'postmark', $this->getSupportedSchemes());
    }

    protected function getSupportedSchemes(): array
    {
        return ['postmark', 'postmark+api', 'postmark+smtp', 'postmark+smtps'];
    }

new Dsn('postmark+api', 'default', self::USER),
            new PostmarkApiTransport(self::USER, new MockHttpClient(), null, $logger),
        ];

        yield [
            new Dsn('postmark+api', 'example.com', self::USER, '', 8080),
            (new PostmarkApiTransport(self::USER, new MockHttpClient(), null, $logger))->setHost('example.com')->setPort(8080),
        ];

        yield [
            new Dsn('postmark+api', 'example.com', self::USER, '', 8080, ['message_stream' => 'broadcasts']),
            (new PostmarkApiTransport(self::USER, new MockHttpClient(), null, $logger))->setHost('example.com')->setPort(8080)->setMessageStream('broadcasts'),
        ];

        yield [
            new Dsn('postmark', 'default', self::USER),
            new PostmarkSmtpTransport(self::USER, null, $logger),
        ];

        yield [
            new Dsn('postmark+smtp', 'default', self::USER),
            new PostmarkSmtpTransport(self::USER, null, $logger),
        ];