feat: fireEvent.emit

[epszaw]

Hello!
I've already asked for help with custom vue events emitting in #233, but I think, it would be nice to have unified way to fire both DOM and vue events.
I propose to use fireEvent.emit as syntax sugar over the __vue__.$emit method.

[afontcu]

Hi! Thank you for the initiative here.

I think this is already solvable by clicking the button and using emitted() to inspect the result. With this addition, tests would rely on implementation details (the custom event) instead of interacting with the component as a user would.

[epszaw]

Hi! Thank you for the initiative here.

I think this is already solvable by clicking the button and using emitted() to inspect the result. With this addition, tests would rely on implementation details (the custom event) instead of interacting with the component as a user would.

I see, what you mean. I'll try to follow this way and return back, if something goes wrong or I'll have example to continue the discussion.