DispatchingMiddleware example

$middleware = new DispatchAfterCurrentBusMiddleware();
        $handlingMiddleware = $this->createMock(MiddlewareInterface::class);

        $eventBus = new MessageBus([
            $middleware,
            $handlingMiddleware,
        ]);

        $messageBus = new MessageBus([
            $middleware,
            new DispatchingMiddleware($eventBus, [
                new Envelope($firstEvent, [new DispatchAfterCurrentBusStamp()]),
                new Envelope($secondEvent, [new DispatchAfterCurrentBusStamp()]),
                $thirdEvent, // Not in a new transaction             ]),
            $handlingMiddleware,
        ]);

        $series = [
            // Third event is dispatch within main dispatch, but before its handling:             $thirdEvent,
            // Then expect main dispatched message to be handled first: