Refactor tests to use pytest.fixtures

[Ckk3]

Description

I refactored a few tests to utilize pytest fixtures. I noticed there were some 'TODO' comments in the tests, so I made the necessary changes.

Types of Changes

• [ ] Core
• [ ] Bugfix
• [ ] New feature
• [x] Enhancement/optimization
• [ ] Documentation

Issues Fixed or Closed by This PR

• There's no Issues for this

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #42 will not alter performance

_{Comparing Ckk3:refactor-tests-files (46de84c) with main (479c50d)}

Summary

✅ 1 untouched benchmarks

[Ckk3]

Looks great! I'll leave it to @mattalbr to do a final check and merge 😊

Thanks!

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