HandleMessageMiddleware example

new DummyMessage('Hey'),
            new DummyMessage('Bob'),
        ];

        $receiver = new DummyReceiver([
            [new Envelope($expectedMessages[0])],
            [new Envelope($expectedMessages[1])],
        ]);

        $handler = new DummyBatchHandler();

        $middleware = new HandleMessageMiddleware(new HandlersLocator([
            DummyMessage::class => [new HandlerDescriptor($handler)],
        ]));

        $bus = new MessageBus([$middleware]);

        $dispatcher = new EventDispatcher();
        $dispatcher->addListener(WorkerRunningEvent::class, function DWorkerRunningEvent $event) use ($receiver) {
            static $i = 0;
            if (1 < ++$i) {
                $event->getWorker()->stop();
                $this->assertSame(2, $receiver->getAcknowledgeCount());
            }

use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;

class HandleMessageMiddlewareTest extends MiddlewareTestCase
{
    public function testItCallsTheHandlerAndNextMiddleware()
    {
        $message = new DummyMessage('Hey');
        $envelope = new Envelope($message);

        $handler = $this->createPartialMock(HandleMessageMiddlewareTestCallable::class, ['__invoke']);

        $middleware = new HandleMessageMiddleware(new HandlersLocator([
            DummyMessage::class => [$handler],
        ]));

        $handler->expects($this->once())->method('__invoke')->with($message);

        $middleware->handle($envelope, $this->getStackMock());
    }

    /** * @dataProvider itAddsHandledStampsProvider */
    

new HandlerDescriptor($transport2HandlerThatWorks, [
                    'from_transport' => 'transport2',
                    'alias' => 'handler_that_works2',
                ]),
            ],
        ]);

        $dispatcher = new EventDispatcher();
        $bus = new MessageBus([
            new FailedMessageProcessingMiddleware(),
            new SendMessageMiddleware($senderLocator),
            new HandleMessageMiddleware($handlerLocator),
        ]);
        $dispatcher->addSubscriber(new AddErrorDetailsStampListener());
        $dispatcher->addSubscriber(new SendFailedMessageForRetryListener($locator, $retryStrategyLocator));

        $dispatcher->addSubscriber(new SendFailedMessageToFailureTransportListener($sendersLocatorFailureTransport));
        $dispatcher->addSubscriber(new StopWorkerOnMessageLimitListener(1));

        $runWorker = function Dstring $transportName) use ($transports, $bus, $dispatcher): ?\Throwable {
            $throwable = null;
            $failedListener = function DWorkerMessageFailedEvent $event) use (&$throwable) {
                $throwable = $event->getThrowable();
            };