8000 gh-124694: In test_interpreter_pool, Restore the Asyncio Event Loop Policy During Cleanup by ericsnowcurrently · Pull Request #125708 · python/cpython · GitHub
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gh-124694: In test_interpreter_pool, Restore the Asyncio Event Loop Policy During Cleanup 8000 #125708

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13 changes: 13 additions & 0 deletions Lib/test/test_concurrent_futures/test_interpreter_pool.py
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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