gh-95736: Fix event loop creation in IsolatedAsyncioTestCase

[serhiy-storchaka]

It should be created before calling the setUp() method, but after
checking for skipping a test.

• Issue: IsolatedAsyncioTestCase does not call asyncio.set_event_loop before setUp anymore, asyncio.Runner+PidFdChildWatcher leaves zombie processes #95736

Automerge-Triggered-By: GH:tiran

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @serhiy-storchaka for commit 1194f25 🤖

If you want to schedule another build, you need to add the ":hammer: test-with-buildbots" label again.

[tiran]

I have a new ticket and PR GH-96031

[gvanrossum]

Well, this fix sure looks simpler than @tiran's. I'll defer judgment until I've had time to look at things more thoroughly though.

[tiran]

Let's merge this PR to unblock and fix main branch. We can solve #95736 and correct the problematic implementation in the async unittest helper later.

[gvanrossum]

The wasm32-wasi PR build fails with a different error:

======================================================================
FAIL: test_errno_mapping (test.test_exception_hierarchy.HierarchyTest.test_errno_mapping)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Lib/test/test_exception_hierarchy.py", line 94, in test_errno_mapping
    self.assertIs(type(e), OSError)
AssertionError: <class 'PermissionError'> is not <class 'OSError'>
----------------------------------------------------------------------

[gvanrossum]

Tho other WASM builds are fine. @tiran what do you think?

[gvanrossum]

Assuming the failing buildbots are explained this LGTM.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @tiran for commit ef7e7f6 🤖

If you want to schedule another build, you need to add the ":hammer: test-with-buildbots" label again.

[tiran]

The wasm32-wasi PR build fails with a different error:

It's an unrelated error which is already fixed in main.

[miss-islington]

@serhiy-storchaka: Status check is done, and it's a pending ❌ .

[miss-islington]

@serhiy-storchaka: Status check is done, and it's a pending ❌ .

[miss-islington]

Status check is done, and it's a success ✅ .

[miss-islington]

Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[miss-islington]

Sorry @serhiy-storchaka, I had trouble checking out the 3.11 backport branch.
Please backport using cherry_picker on command line.
cherry_picker 36517101dd80cae93da379e95e98a688c52935b7 3.11

[miss-islington]

Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[bedevere-bot]

GH-96041 is a backport of this pull request to the 3.11 branch.