test_contextlib_async logs "Task was destroyed but it is pending" messages

[vstinner]

BPO	45206
Nosy	@vstinner

^{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 = None
created_at = <Date 2021-09-15.13:23:17.714>
labels = ['tests', '3.11']
title = 'test_contextlib_async logs "Task was destroyed but it is pending" messages'
updated_at = <Date 2021-09-15.13:23:17.714>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2021-09-15.13:23:17.714>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2021-09-15.13:23:17.714>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 45206
keywords = []
message_count = 1.0
messages = ['401834']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue45206'
versions = ['Python 3.11']

[vstinner]

3 tests of test_contextlib_async logs messages. I would prefer a quiet output.

test_contextmanager_trap_second_yield (test.test_contextlib_async.AsyncContextManagerTestCase) ...
Task was destroyed but it is pending!
task: <Task pending name='Task-12' coro=<<async_generator_athrow without __name__>()>>
ok

test_contextmanager_trap_yield_after_throw (test.test_contextlib_async.AsyncContextManagerTestCase) ...
Task was destroyed but it is pending!
task: <Task pending name='Task-14' coro=<<async_generator_athrow without __name__>()>>
ok

test_async_gen_propagates_generator_exit (test.test_contextlib_async.TestAbstractAsyncContextManager) ...
Task was destroyed but it is pending!
task: <Task pending name='Task-20' coro=<<async_generator_athrow without __name__>()>>
ok

Current output:
---

$ ./python -m test test_contextlib_async 
0:00:00 load avg: 12.33 Run tests sequentially
0:00:00 load avg: 12.33 [1/1] test_contextlib_async
Task was destroyed but it is pending!
task: <Task pending name='Task-12' coro=<<async_generator_athrow without __name__>()>>
Task was destroyed but it is pending!
task: <Task pending name='Task-14' coro=<<async_generator_athrow without __name__>()>>
Task was destroyed but it is pending!
task: <Task pending name='Task-20' coro=<<async_generator_athrow without __name__>()>>

== Tests result: SUCCESS ==

1 test OK.

Total duration: 837 ms
Tests result: SUCCESS
---