Test Failure Summary: A JavaScript test fails because the code tries to access the name property on an undefined value. --- Likely Root Cause: The function assumes a user object is always provided, but the test passes an undefined or missing user value. --- Fixes Applied: - Added a guard clause for missing user input - Preserved the existing behavior for valid user objects --- Files Modified: - src/userFormatter.js --- Commands Executed: - npm test --- Verification Result: Relevant tests now pass successfully. --- Next Steps: Add an explicit test case for missing user input to prevent future regressions.