Creating fake event objects for testing components.

Say I want to test a component behavior where preventDefault() or stopPropagation() is called on some event.

In vanilla JS land, I would create a fake event object, passing it to the event handler and be done with it. However, with types, any fake event has to line up with the expected event type for both TS and Dart. One could almost just do class FakeEvent extends Event, but IE doesn’t support instantiating event objects with new.

From here, there’s no clear way of getting a fake event object that works with the handler’s signature

[jelbourn]

Yeah, though we may end up deciding that it’s something that’s more appropriate for the cdk.

[splincode]

@jelbourn Is the issue relevant?