Results: 2/7 passed
FAIL: mergeContacts is implemented and exported -- mergeContacts export is missing
FAIL: student tests cover createdAt conflict -- src/test.js does not reference mergeContacts
PASS: npm test passes
FAIL: later input order wins over older-looking createdAt timestamps -- mergeContacts is not a function
FAIL: empty later fields do not erase earlier useful values -- mergeContacts is not a function or its return value is not iterable
FAIL: first-seen group position is preserved -- mergeContacts is not a function
PASS: implementation does not sort by createdAt
VERDICT: FAIL (5 failed)
