This is bug report for pytest-datadir issue #36.
C:\Users\foobar\repo> pytest -k test_datadir -s tests\
========================================= test session starts =========================================
platform win32 -- Python 3.8.2, pytest-6.2.1, py-1.10.0, pluggy-0.13.1
rootdir: C:\Users\foobar\repo
plugins: datadir-1.3.1
collected 7 items / 6 deselected / 1 selected