Make cache directory path Windows friendly #71
Merged
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The existing logic for building the cache directory path assumes *nix style paths when attempting to make a unique cache dir for each test fixture and step. Paths with a Windows drive prefix on the front ("C:\...") muck this up. Pathlib's '/' operator silently covers this up (under Python 3.9 on Windows, at least).
This change reasonably preserves the uniqueness logic whilst being Window friendly by taking a hash of the path to the test fixture's configuration directory
tfdir
and using that in the cache directory path construction.