Detect blocking calls in coroutines during tests using BlockBuster #197
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This PR uses the blockbuster library to detect blocking calls made in the asyncio event loop during unit tests.
Avoiding blocking calls is hard as these can be deeply buried in the code or made in 3rd party libraries.
Blockbuster makes it easier to detect them by raising an exception when a call is made to a known blocking function (eg:
time.sleep).