Test 4: Validating duplicate detection...
Found 11 duplicate groups:
  - John Smith: 1 duplicate(s)
  - Alice Johnson: 1 duplicate(s)
  - Bob Brown: 1 duplicate(s)
  - Charlie Davis: 1 duplicate(s)
  - Dave Wilson: 1 duplicate(s)
  - Grace Hall: 1 duplicate(s)
  - Jane Doe: 1 duplicate(s)
  - Katie Lee: 1 duplicate(s)
  - Liam Moore: 1 duplicate(s)
  - Noah Scott: 1 duplicate(s)
  - Olivia Taylor: 1 duplicate(s)
WARNING: 'John Smith' has 1 duplicates, expected 2
ERROR: Expected duplicate group for 'Sarah Johnson' not found
ERROR: Expected duplicate group for 'Michael Brown' not found
ERROR: Expected duplicate group for 'Jennifer Davis' not found
ERROR: Expected duplicate group for 'Robert Wilson' not found
ERROR: Expected duplicate group for 'Lisa Anderson' not found

ERROR: Missing 5 expected duplicate groups