Service layer (payment_fulfillment_order_not_found_test.go):
- TestHandlePaymentNotification_UnknownOrder_ReturnsSentinel: in-memory
sqlite ent client, query for a non-existent out_trade_no → errors.Is
must recognise ErrOrderNotFound (handler relies on this to ack 200).
- TestHandlePaymentNotification_NonSuccessStatus_Skips: non-success
notification short-circuits before DB lookup → nil error.
- TestErrOrderNotFound_DistinctFromOtherErrors: generic errors must not
match the sentinel (prevents silently swallowing DB failures).
Handler layer (payment_webhook_handler_test.go):
- TestUnknownOrderWebhookAcksWithSuccess: locks the two ingredients the
handleNotify ack path depends on — fmt.Errorf %w wrapping preserves
errors.Is recognition, and writeSuccessResponse(stripe) returns an
empty 200 body that Stripe treats as acknowledged.
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