test: allow skipping S3-related tests

[miketheman]

Show the user how to skip S3 tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.70%. Comparing base (4d020e8) to head (5e1c38d).
Report is 122 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1766      +/-   ##
==========================================
+ Coverage   79.69%   83.70%   +4.00%     
==========================================
  Files          31       33       +2     
  Lines        4324     4381      +57     
  Branches      780      783       +3     
==========================================
+ Hits         3446     3667     +221     
+ Misses        721      531     -190     
- Partials      157      183      +26     

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[miketheman]

I also thought a little bit about https://pypi.org/project/pytest-minio-mock/ - that might be a more interesting long-term idea, so no real minio server has to be running for tests.

[cooperlees]

Nice. Thanks for this. Will make easier for people not touching S3.

I would totally move a mocked library to make these unit tests again ...

• But I worry about over mocking hiding issues these integration tests have found - e.g. auth setting bugs etc.