stubs

Is your feature request related to a problem? Please describe.
Today we silently ignore stubbing issues, such as trying to use sinon.stub(obj, 'prop'), when obj.prop is a synthetic getter. From a user perspective, it is probably more user friendly to be explicitly told immediately that this Object.descriptor is non-configurable (perhaps even with a link to a Sinon doc page!) and cannot be

A "normal" event on an instance ignores null subscriptions. If I do so on a substituted interface, a null subscription leads to an exception. I have a not so nice legacy code with different listeners to an event an one class that does null-attach internally under some conditions, would be nice if this behaviour would be able to be tested as well. Example code for the problem:

        publ

I hope the official can add a new command to automatically generate RESTful API