getAcknowledgeCount example

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

        $this->assertSame($apiMessage, $envelopes[0]->getMessage());
        $this->assertSame($ipaMessage, $envelopes[1]->getMessage());
        $this->assertCount(1, $envelopes[0]->all(ReceivedStamp::class));
        $this->assertCount(1, $envelopes[0]->all(ConsumedByWorkerStamp::class));
        $this->assertSame('transport', $envelopes[0]->last(ReceivedStamp::class)->getTransportName());

        $this->assertSame(2, $receiver->getAcknowledgeCount());
    }

    public function testHandlingErrorCausesReject()
    {
        $receiver = new DummyReceiver([
            [new Envelope(new DummyMessage('Hello'), [new SentStamp('Some\Sender', 'transport1')])],
        ]);

        $bus = $this->createMock(MessageBusInterface::class);
        $bus->method('dispatch')->willThrowException(new \InvalidArgumentException('Why not'));