In unittest.TestCase, tearDown() is always called if setUp() is successful. It is only not called when setUp() fails. In IsolatedAsyncioTestCase, which is a subclass of TestCase, tearDown() is not called if setUp() is successful, but asyncSetUp() fails. I think is a problem.

Linked PRs

• gh-96139: [unittest] call tearDown even if asyncSetUp fails #99596