test: add unit tests for restoreNames

[Nazarii-Lesniak]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your test file for restoreNames is well-structured and successfully validates all core requirements. The three test cases properly verify function existence, restoration of firstName from fullName for both undefined values and missing keys, and preservation of existing firstName values. The tests use appropriate Jest assertions (toBeInstanceOf, toEqual) and match the expected array structure from the requirements. One minor improvement you could consider: the requirements mention the function should not return anything, but there's no explicit assertion validating this void return behavior. While not critical, adding a simple test like expect(restoreNames(users)).toBeUndefined() would make the test suite more complete. This is optional since your current tests already cover the essential functionality thoroughly.

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