How to test/assert if an event is broadcasted in Laravel

I am developing a Laravel application. I am using Laravel Broadcast in my application. What I am trying to do now is that I am trying to test if an event is broadcasted in Laravel.

I am broadcasting an event like this:

broadcast(new NewItemCreated($item));

I want to test if the event is broadcasted. How can I test it? I mean in unit test. I want to do something like

Broadcast::assertSent(NewItemCreated::class) 

Additional information

That event is broadcasted within the observer event that is triggered when an item is created.

I think you can treat broadcasting more or less like events, so you can refer to this section of the documentation.