> asyncio uses loop.create_future() to create sockets.  I'd suggest you to create two base test classes: one that monkeypatches loop.create_future to return pure python Future in its setUp method; an another, that makes create_future to return a C version of the Future.

windows_events.py has some classes extends futures.Future.
Task extends Future.
There are some `isinstance(future, futures.Future)`.

So monkeypatching `baseevent.create_future` seems not enough.
I want a way to completely reload asyncio and test_asyncio packages with and without C future.