Labellers testing module

[agustinaarroyuelo]

Co-authored-by: Oriol Abril-Pla oriol.abril.pla@gmail.com

Description

Here we will add a new testing module specific for the labeller classes. It will fix #1574.

Checklist

• Follows official PR format
• New features are properly documented (with an example if appropriate)?
• Includes new or updated tests to cover the new feature
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

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📚 Documentation preview 📚: https://arviz--2095.org.readthedocs.build/en/2095/

[agustinaarroyuelo]

Thanks for your comments @OriolAbril. I cleaned up the script trying to get a minimum working unit. If we agree on it, we can start adding more tests.

[OriolAbril]

The tests are passing and I think they can be understood even if focus is probably more on avoiding repetition. I think we can follow this pattern unless maybe @canyon289 has some ideas on how to improve it?

[codecov]

Codecov Report

Merging #2095 (6a152b2) into main (655c4f7) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2095      +/-   ##
==========================================
+ Coverage   90.76%   90.88%   +0.11%     
==========================================
  Files         117      117              
  Lines       12501    12501              
==========================================
+ Hits        11347    11361      +14     
+ Misses       1154     1140      -14     

Impacted Files	Coverage Δ
arviz/labels.py	94.66% <0.00%> (+18.66%)	⬆️

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