Test 4: Validating duplicate detection...
Found 11 duplicate groups:
  - John Smith: 1 duplicate(s)
  - Jane Doe: 1 duplicate(s)
  - Robert Brown: 1 duplicate(s)
  - Emily White: 1 duplicate(s)
  - Michael Green: 1 duplicate(s)
  - Laura Black: 1 duplicate(s)
  - David King: 1 duplicate(s)
  - Sarah Miller: 1 duplicate(s)
  - Christopher Wilson: 1 duplicate(s)
  - Patricia Young: 1 duplicate(s)
  - J. Hall: 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