[issue46426] Improve tests for the dir_fd argument

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
pull_requests: +28868
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30668

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46426>
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