FA-85462 / Ride-hailing fare and surge pricing / Member archive

ETA improvement treated as driver lateness · case 02

Riders are charged although the ETA ballooned by ten minutes.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Decide a cancellation charge [cents, reason]. Driver cancellations are free. A rider cancelling at or after driver arrival pays the no-show fee if at least noshow_wait seconds passed since arrival, else the regular fee. Before arrival, cancelling within free_window seconds of acceptance is free; it is also free if the ETA grew by more than late_margin since acceptance, or if the driver is more than late_margin past the ETA promised at acceptance; otherwise the regular fee applies.

Why this case matters

Ride-hailing prices are computed per trip at scale; ordering, unit and boundary slips become systematic over- or under-charging.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: eta growth direction	`[0, "driver_late"]`	`[500, "late_cancel"]`	Failed

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