Fix tests

[albangossard]

• Fix tests
• Apply code formatter to the files that were not formatted

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.75%. Comparing base (2f79cae) to head (83ccac4).
⚠️ Report is 56 commits behind head on main.

Files with missing lines	Patch %	Lines
massbalancemachine/config.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
- Coverage   47.60%   44.75%   -2.85%     
==========================================
  Files          44       44              
  Lines        4109     4433     +324     
==========================================
+ Hits         1956     1984      +28     
- Misses       2153     2449     +296     

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