PASS real isolated Redis connection
PASS parallel worker generated 500 order numbers
PASS parallel worker generated 500 order numbers
PASS parallel worker generated 500 order numbers
PASS parallel worker generated 500 order numbers
PASS 2000 concurrent order numbers are unique
PASS order sequence has bounded 120-second expiry
PASS existing replay order number preserved
PASS forced replay consumed once
PASS 8 simultaneous duplicate submissions: exactly one accepted
PASS different business keys do not block each other
PASS duplicate key rejected before expiry
PASS key eligible again after expiry
PASS Redis unavailable and cache fallback behavior verified
PASS Redis unavailable: order number fails explicitly, duplicate guard falls back
PASS Redis upgrade 14 checks