tests: add package repository tests

[lengau]

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• [x] Have you successfully run tox?

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Added these while I was adding pinning to package repositories. Not a direct requirement of the work item, but I'm going to change some things that weren't fully tested.

[codecov[bot]]

Codecov Report

Merging #38 (17f6253) into main (7bf8c35) will increase coverage by 1.41%. The diff coverage is n/a.

:exclamation: Current head 17f6253 differs from pull request most recent head 5c55e7e. Consider uploading reports for the commit 5c55e7e to get more accurate results

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   78.42%   79.83%   +1.41%     
==========================================
  Files          11       11              
  Lines         496      496              
  Branches      110      110              
==========================================
+ Hits          389      396       +7     
+ Misses         76       75       -1     
+ Partials       31       25       -6     

see 1 file with indirect coverage changes

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