FA-85427 / Ride-hailing fare and surge pricing / Member archive

Partial wait minutes not billed · case 02

A rider who kept the driver 61 seconds past grace pays for one minute instead of two.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Wait time starts at driver arrival, or at the scheduled pickup time if the ride was scheduled and the driver arrived early. The first grace seconds are free; beyond that each started minute is billed at per_min cents, up to cap_min billed minutes. Return the wait fee in cents.

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: started minute billing	`0`	`25`	Failed

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