> STINNER Victor added the comment:
> 
> Barry: would you be ok to start by adding Controller to asyncio.test_utils,
> and wait later to expose it in the public API?

Sorry, but we are going to deprecate and remove test_utils soon. It's a bunch of internal unit test helpers used privately by asyncio. They are not documented and not supported. Now that asyncio repo is in CPython repo and we don't release it on its own, i see no reason to keep test_utils (we can move it to 'Lib/test'.

Again, the natural way of something like Controller to end up in asyncio is to either go through full PEP process, or live some time on PyPI and prove to be useful.