Hello,
if you're like me and like asyncio and pytest, I've put together something to make it easier:
https://github.com/Tinche/pytest-asyncio. It's up on PyPI as well.
Hopefully the README is enough, if you'd like some real-world examples you can take a look at my aiofiles tests which use it (
https://github.com/Tinche/aiofiles/tree/master/tests).
Travis is having some issues with the builds so I don't have the coverage badge working yet, but there's 100% coverage. (Doesn't mean it's bug-free of course, just that it's probably fine. :)