In non-trivial tests, you may want to wait for a method to be called in another thread. This is a case where unittest.mock currently doesn't help. It would be nice to be able to write:
myobj.some_method = Mock(side_effect=myobj.some_method)
# launch some thread
myobj.some_method.wait_until_called()
And perhaps
myobj.some_method.wait_until_called_with(...)
(with an optional timeout?)
If we don't want every Mock object to embed a threading.Event, perhaps there could be a ThreadedMock subclass?
Or perhaps even:
WaitableMock(..., event_class=threading.Event)
so that people can pass multiprocessing.Event if they want to wait on the mock from another process?