Andrew Svetlov <andrew.svet...@gmail.com> added the comment:

This print comes from asyncio debug mode when async function is blocked by time 
longer than 0.1 sec (see loop.slow_callback_duration at 
loop.slow_callback_duration).
Usually, it is a sign of a problem in user code, e.g. something should be 
pushed into executor.

A test case is executed in debug mode. I think it is reasonable for the test 
run, isn't it?

The mode can be disabled by `asyncio.get_running_loop().set_debug(False)` in 
`asyncSetUp()` method.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38608>
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