Testing existing components and functions

[ph-nathan]

Summary

Added tests, fix minor bugs, warnings related to keys and tidy codes.

Changes

• Added unit tests for components and utils functions.
• Code coverage has improved.

Dev testing

(https://github.com/wr1159/advent/assets/99804772/7955e815-7631-4153-b57e-72257d076958)

Checklist

• [x] Test coverage has not deteriorated
• [ ] CI is green
• [ ] Added hours into project log
• [ ] Strikethrough in sprint google slides.

[github-actions[bot]]

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