[issue46425] Multiple test modules fail to run if invoked directly

[Nikita Sobolev]

Nikita Sobolev <mail at sobolevn.me> added the comment:

Important note, in practice there's also a difference in how one calls some test module:

- python Lib/test/test_contextlib.py
- python ./Lib/test/test_contextlib.py

Example of a test failure because of that: https://github.com/python/cpython/pull/30681

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