Refactor benchmarks' tests

[sfmig]

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Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

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How has this PR been tested?

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Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
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[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (ffee651) 82.75% compared to head (1fcb6f2) 82.23%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
benchmarks/cellfinder_core.py	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
- Coverage   82.75%   82.23%   -0.53%     
==========================================
  Files          27       26       -1     
  Lines        1577     1452     -125     
==========================================
- Hits         1305     1194     -111     
+ Misses        272      258      -14     

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[sfmig]

deprecated in favour of #96