Calling callbacks as a default mock implementation

[Bludator]

This is more for discussion than anything.

There are lots of callbacks (promises in FF) in the web-extension API. And I guess it would be fair to implement all functions with them so, that the callbacks/promises would be called immediately.

Now, one have to overwrite all mocked function, where callback call is needed, with new mock with implementation with callback call weather any other than call is needed or not.

Issues

What to pass as parameters which are often needed?