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(1) Cannot open a temp file for writing from 2 python processes simultaneously (2) Need proper environment setup for Popen (thanks to metatoaster's reply on stackoverflow https://stackoverflow.com/a/72845540/4405656) (3) Need different os-separator, so replace hard-coded '/' with os.path.join or os.sep (4) Minor cleanup of imports & whitespace in test_issue_*.py There are still 2 tests that should be adapted to Windows, but those are lower-prio in my eyes. Also, unittest run on my windows VM creates many resource warnings due to non-closed file descriptors. Should address that some (future) day.
