Specify rootdir to recursive pytest calls (fixes #110)

[juliangilbey]

Following a discussion on the pytest issue pytest-dev/pytest#11781 the source of #110 has become a little clearer: the rootdir was set to /tmp, being the common ancestor of the temporary test directory and the invocation directory in the CI environment. This patch specifies the rootdir explicitly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.29%. Comparing base (19dae40) to head (7e2a507).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
+ Coverage   97.21%   98.29%   +1.08%     
==========================================
  Files           5        5              
  Lines         575      588      +13     
  Branches      136      141       +5     
==========================================
+ Hits          559      578      +19     
+ Misses          9        2       -7     
- Partials        7        8       +1     

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[mrbean-bremen]

Thanks a lot! Can you add an entry in the release notes?

[mrbean-bremen]

Thanks!