Addition of `isInstance` test of `BackendSerial`

[talagayev]

Fixes #4657

Changes made in this Pull Request:

• Addition of test_instance_serial_backend to test_base.py to check that the function works and the instance is correct

Currently I just create a variable of BackendSerial for serial_backend , which I use in FrameAnalysis(u.trajectory).run to display that it runs with the backend=serial_backend and also then check the correct instance of serial_backend

I wasn't sure here if I should check the instance of backend of the run() in FrameAnalysis(u.trajectory).run(backend=serial_backend), since then I would need to modify the code to get the instance of backend from run()

PR Checklist

• [x] Tests?
• [x] Docs?
• [x] CHANGELOG updated?
• [x] Issue raised/referenced?

Developers certificate of origin

• [x] I certify that this contribution is covered by the LGPLv2.1+ license as defined in our LICENSE and adheres to the Developer Certificate of Origin.

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📚 Documentation preview 📚: https://mdanalysis--4773.org.readthedocs.build/en/4773/

[pep8speaks]

Hello @talagayev! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2024-11-13 19:57:25 UTC

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.29%. Comparing base (e776f12) to head (7d0dc7a). Report is 5 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #4773 +/- ## =========================================== - Coverage 93.66% 93.29% -0.38% =========================================== Files 177 189 +12 Lines 21726 22808 +1082 Branches 3052 3055 +3 =========================================== + Hits 20349 21278 +929 - Misses 930 1071 +141 - Partials 447 459 +12 ```

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[RMeli]

I restarted the failing job. The timeout is a known issue unfortunately.