test: add unit tests for getCoinCombination function

[sonik-boom71]

Базовый случай: 0 → [0,0,0,0]
Каждая монета отдельно: 1, 5, 10, 25 cents
Смешанные: 41 → [1,1,1,1], 99 → [4,0,2,3]
Произвольные: 30, 67, 100 cents
Структура возвращаемого значения (массив из 4 чисел)

[mateacademy-ai-mentor]

Review Summary

Your solution is approved. The test file successfully implements all required test cases for the getCoinCombination function. Tests properly verify the function declaration, return type validation (array of 4 numbers), and various coin combinations including edge cases like 0 cents and mixed amounts (41, 99, 30, 67, 100 cents). All 9 checklist requirements are met, and Jest assertions are used correctly throughout. No critical issues were found—the implementation is complete and functional.

---

✨ Please rate this review in the Platform's notification center¹. I will be grateful for your feedback! ✨

Footnotes

1. Rate AI review example ↩