⚙️ Add tests for WarmupManager

[swiftyfinch]

Description

I've added tests for WarmupManagerTests.

References

• #236

Checklist (I have ...)

• 🧐 Followed the code style of the rest of the project
• 📖 Updated the documentation, if necessary
• 👨🏻‍🔧 Added at least one test which validates that my change is working, if appropriate
• 👮🏻‍♂️ Run make lint and fixed all warnings
• ✅ Run make test and fixed all tests

❤️ Thanks for contributing to the 🏈 Rugby!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5067c83) 47.12% compared to head (9952579) 50.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #307      +/-   ##
==========================================
+ Coverage   47.12%   50.98%   +3.86%     
==========================================
  Files         142      142              
  Lines        4168     4168              
==========================================
+ Hits         1964     2125     +161     
+ Misses       2204     2043     -161     

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