tests: add test infra and one test

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@c59684f). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head 822b1e5 differs from pull request most recent head ff8c66b. Consider uploading reports for the commit ff8c66b to get more accurate results

@@           Coverage Diff           @@
##             main       #9   +/-   ##
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  Coverage        ?   77.50%           
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  Files           ?        3           
  Lines           ?      120           
  Branches        ?        0           
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  Hits            ?       93           
  Misses          ?       27           
  Partials        ?        0           

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[maelle]

@krlmlr I can't merge this since I don't have write access :wink:

[krlmlr]

Thanks!