> payments@1.4.0 test > jest --config jest.config.ts --runInBand PASS services/payments/retry.test.ts withRetry retries on transient errors (18 ms) applies exponential backoff with jitter (24 ms) gives up after maxAttempts (9 ms) PASS services/payments/idempotency.test.ts keyFor derives a stable key from the request (6 ms) FAIL services/payments/charge.test.ts createCharge rejects duplicate idempotency keys (31 ms) Test Suites: 1 failed, 2 passed, 3 total Tests: 1 failed, 5 passed, 6 total Time: 4.12 s