Configure warnings to error in pytest

[michael-christen]

Configure warnings to error in pytest: https://docs.pytest.org/en/stable/how-to/capture-warnings.html#controlling-warnings

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (b59e230) to head (d57393c). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #161 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 5 5 Lines 56 56 ========================================= Hits 56 56 ```

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