feat(test): qa_restore-names

[xapg6acc]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your test suite for restoreNames is solid and meets the stated requirements for the task. You correctly cover restoring firstName when it is missing or explicitly undefined, and you verify that existing firstName values are left unchanged. The tests also confirm that the function works in-place on the users array and that it does not return a value, which aligns with the specification. Handling of multiple users and the empty array case is properly tested, showing good attention to typical edge cases. The examples using Jack Holy and Mike Adams match the described behavior of reconstructing firstName from fullName. Overall, your tests are clear, focused, and use Jest expectations appropriately, so your solution is approved. Nice work covering the core behaviors cleanly and comprehensively.

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