createDoctrineEnvelope example

use Symfony\Component\Messenger\Transport\Serialization\Serializer;
use Symfony\Component\Serializer as SerializerComponent;
use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;

class DoctrineReceiverTest extends TestCase
{
    public function testItReturnsTheDecodedMessageToTheHandler()
    {
        $serializer = $this->createSerializer();

        $doctrineEnvelope = $this->createDoctrineEnvelope();
        $connection = $this->createMock(Connection::class);
        $connection->method('get')->willReturn($doctrineEnvelope);

        $receiver = new DoctrineReceiver($connection, $serializer);
        $actualEnvelopes = $receiver->get();
        $this->assertCount(1, $actualEnvelopes);
        /** @var Envelope $actualEnvelope */
        $actualEnvelope = $actualEnvelopes[0];
        $this->assertEquals(new DummyMessage('Hi'), $actualEnvelopes[0]->getMessage());

        /** @var DoctrineReceivedStamp $doctrineReceivedStamp */