FA-92885 / EV charging session scheduling / Member archive

Post-charge idle occupancy fee: block rounding · case 05

Idle minutes shorter than a full block are never billed.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Times are minutes 0..1440 of one day. done is when charging finished (None: never finished, no idle fee). Idle time starts at done+grace and ends at unplug (exclusive). Only minutes in [360, 1320) are billable (night waiver). Fee = ceil(billable/block)*rate cents, then capped at cap when cap is not None (cap 0 waives the fee). Return [billable minutes, fee].

Why this case matters

Depot, workplace and public EV chargers schedule sessions against prices, circuit limits and departure deadlines; a wrong decision silently strands a driver or overloads a feeder.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: block rounding	`[116, 115]`	`[116, 120]`	Failed

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