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Establish a framework for unit testing and implement some examples:
Use PlatformIO testing with the Unity framework
Add detailed comments to files in
firmware/lib/motor
andfirmware/lib/pid
Create native unit tests for PID
Create embedded unit tests for motors (2 of 4 types so far - generic ones)
Add running native (desktop) unit tests to GitHub Actions CI
Describe Unit Testing in README
Other unit tests should still be added in future PRs, but this should serve as good example for developers writing unit tests for features.