Feature Request: Testing Event Subscribers

[junyang-chin]

Currently there are methods to test whether a listener is listening to an event by using the assertListening method

    ...

    Event::fake();
    Event::assertListening(
        OrderShipped::class,
        SendShipmentNotification::class
    );

   ...

However, there are no available methods to assert an Event Subscriber is listening to multiple events
It would be great if we could have something like

    ...

    Event::assertSubscribing(
        [
            OrderShipped::class,
            OrderDelayed::class,
        ],
        OrderEventsSubscriber::class
    );
    
    ...