unittest.IsolatedAsyncioTestCase hangs on asyncio.CancelledError

[AndreyMoiseev]

BPO	39706
Nosy	@asvetlov, @1st1, @lisroach
PRs	bpo-39101: Fixes BaseException hang in IsolatedAsyncioTestCase. #22654

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-10-26.16:28:53.559>
created_at = <Date 2020-02-21.10:12:48.627>
labels = ['type-bug', 'expert-asyncio']
title = 'unittest.IsolatedAsyncioTestCase hangs on asyncio.CancelledError'
updated_at = <Date 2020-10-26.16:28:53.558>
user = 'https://bugs.python.org/AndreyMoiseev'

bugs.python.org fields:

activity = <Date 2020-10-26.16:28:53.558>
actor = 'lisroach'
assignee = 'none'
closed = True
closed_date = <Date 2020-10-26.16:28:53.559>
closer = 'lisroach'
components = ['asyncio']
creation = <Date 2020-02-21.10:12:48.627>
creator = 'Andrey Moiseev'
dependencies = []
files = []
hgrepos = []
issue_num = 39706
keywords = ['patch']
message_count = 1.0
messages = ['362402']
nosy_count = 4.0
nosy_names = ['asvetlov', 'yselivanov', 'lisroach', 'Andrey Moiseev']
pr_nums = ['22654']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39706'
versions = []

[AndreyMoiseev]

The following code hangs:

import asyncio
import unittest


class TestCancellation(unittest.IsolatedAsyncioTestCase):

    async def test_works(self):
        raise asyncio.CancelledError()


if __name__ == '__main__':
    unittest.main()