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self.doCleanups() cannot be called from a test method of a unittest.IsolatedAsyncioTestCase subclass #101018

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self.doCleanups() cannot be called from a test method of a unittest.IsolatedAsyncioTestCase subclass#101018
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3.13bugs and security fixesbugs and security fixes3.14bugs and security fixesbugs and security fixes3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesdocsDocumentation in the Doc dirDocumentation in the Doc dirstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
@zware

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@zware
zware
opened on Jan 13, 2023
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Example:

import unittest


events = []

class Test(unittest.IsolatedAsyncioTestCase):

    def test(self):
        events.append('started')
        self.addCleanup(events.append, 'cleanup')
        self.doCleanups()
        events.append('end')

unittest.main(exit=False)

assert events == ['started', 'cleanup', 'end'], events

The above passes in 3.9 and 3.10, but fails in 3.11 with

E
======================================================================
ERROR: test (__main__.Test)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/.../cpython/Lib/unittest/async_case.py", line 75, in _callCleanup
    self._callMaybeAsync(function, *args, **kwargs)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/.../cpython/Lib/unittest/async_case.py", line 95, in _callMaybeAsync
    return self._asyncioTestContext.run(func, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: cannot enter context: <_contextvars.Context object at 0x7fb2f93a9900> is already entered

----------------------------------------------------------------------
Ran 1 test in 0.002s

FAILED (errors=1)
Traceback (most recent call last):
  File "<stdin>", line 16, in <module>
AssertionError: ['started', 'end']

git bisect found the culprit to be gh-91150/GH-31837.

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    3.13bugs and security fixesbugs and security fixes3.14bugs and security fixesbugs and security fixes3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesdocsDocumentation in the Doc dirDocumentation in the Doc dirstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

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