Treat warnings as errors in tests #280
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Fixes #279
Enable that warnings are treated as errors in the testsuite.
I fixed a couple of warnings in main code that would probably hit us badly in the next release of sklearn...
Also, I adjusted some tests for catching warnings using the
pytest.warnscontext manager but there are a lot more. Maybe if @cajchristian or someone else from @rosecers' team can help with fixing them. Almost all of them are very easy to fixContributor (creator of PR) checklist
For Reviewer
📚 Documentation preview 📚: https://scikit-matter--280.org.readthedocs.build/en/280/