getAcknowledgedEnvelopes example

$stamp = new class() implements StampInterface {
        };
        $listener = function DWorkerMessageReceivedEvent $event) use ($stamp) {
            $event->addStamps($stamp);
        };

        $eventDispatcher->addListener(WorkerMessageReceivedEvent::class, $listener);

        $worker = new Worker([$receiver], $bus, $eventDispatcher, clock: new MockClock());
        $worker->run();

        $envelope = current($receiver->getAcknowledgedEnvelopes());
        $this->assertCount(1, $envelope->all($stamp::class));
    }

    public function testWorkerRateLimitMessages()
    {
        $envelope = [
            new Envelope(new DummyMessage('message1')),
            new Envelope(new DummyMessage('message2')),
        ];
        $receiver = new DummyReceiver([$envelope]);