[issue9999] test_shutil cross-file-system tests are fragile (may not test what they purport to test)

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

> Unfortunately I don't currently have a suggestion for how to reliably
> create a cross-file-system link for testing purposes.

We could try walking a list of common mount points (/run, /dev, /tmp, /home, etc.), compiled from as many OSes as possible, and filter it with os.path.ismount to see if we have more than one partition.

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