Lib/test/test_contextlib_async.py failed when ran as a script

BPO	34183
Nosy	@serhiy-storchaka
PRs	bpo-34183: Fix running Lib/test/test_contextlib_async.py as a script. #8381 [3.7] bpo-34183: Fix running Lib/test/test_contextlib_async.py as a script. (GH-8381) #8422

^{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 = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2018-07-23.22:05:43.185>
created_at = <Date 2018-07-21.17:40:37.410>
labels = ['3.7', '3.8', 'type-bug', 'tests']
title = 'Lib/test/test_contextlib_async.py failed when ran as a script'
updated_at = <Date 2018-07-23.22:05:43.184>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-07-23.22:05:43.184>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2018-07-23.22:05:43.185>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2018-07-21.17:40:37.410>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 34183
keywords = ['patch']
message_count = 3.0
messages = ['322112', '322255', '322269']
nosy_count = 1.0
nosy_names = ['serhiy.storchaka']
pr_nums = ['8381', '8422']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34183'
versions = ['Python 3.7', 'Python 3.8']