DummyMessageWithoutTransport example

$this->assertSame($message->getSubject(), $nullMessage->getSubject());
        $this->assertSame($message->getRecipientId(), $nullMessage->getRecipientId());
        $this->assertSame($message->getOptions(), $nullMessage->getOptions());

        (null === $message->getTransport())
            ? $this->assertSame('null', $nullMessage->getTransport())
            : $this->assertSame($message->getTransport(), $nullMessage->getTransport());
    }

    public static function messageDataProvider(): \Generator
    {
        yield [new DummyMessageWithoutTransport()];
        yield [new DummyMessageWithTransport()];
    }
}