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gh-124694: In test_interpreter_pool, Restore the Asyncio Event Loop Policy During Cleanup #125708

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Merged
merged 4 commits into from
Oct 18, 2024
Merged

gh-124694: In test_interpreter_pool, Restore the Asyncio Event Loop Policy During Cleanup #125708

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af52044
Clear the default event loop policy if it might have been set.
ericsnowcurrently Oct 18, 2024
b0519f9
Move the cleanup to the class teardown.
ericsnowcurrently Oct 18, 2024
216cc99
Add a comment about clearing the policy.
ericsnowcurrently Oct 18, 2024
0f6c50f
Update Lib/test/test_concurrent_futures/test_interpreter_pool.py
ericsnowcurrently Oct 18, 2024
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13 changes: 13 additions & 0 deletions 13 Lib/test/test_concurrent_futures/test_interpreter_pool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -282,6 +282,19 @@ def test_idle_thread_reuse(self):

class AsyncioTest(InterpretersMixin, testasyncio_utils.TestCase):

@classmethod
def setUpClass(cls):
# Most uses of asyncio will implicitly call set_event_loop_policy()
# with the default policy if a policy hasn't been set already.
# If that happens in a test, like here, we'll end up with a failure
# when --fail-env-changed is used. That's why the other tests that
# use asyncio are careful to set the policy back to None and why
# we're careful to do so here. We also validate that no other
# tests left a policy in place, just in case.
policy = support.maybe_get_event_loop_policy()
assert policy is None, policy
cls.addClassCleanup(lambda: asyncio.set_event_loop_policy(None))

def setUp(self):
super().setUp()
self.loop = asyncio.new_event_loop()
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