FA-68615 / Toll and parking fee computation / Member archive
Pay-by-plate invoice and tag discount: exempt trips fall through to plate billing · case 05
Pay-by-plate invoice and tag discount returns a wrong result when exempt trips fall through to plate billing.
Case contract
Input {trips: [[day (0-based), base cents, tag|plate|exempt]], plate_surcharge_pct, tag_discount_pct, invoice_fee, cycle_days}. Exempt trips are ignored. Tag trips pay base minus a discount floored to cents. Plate trips pay base plus a surcharge rounded up to cents and are grouped into invoices by billing period day // cycle_days; each invoice adds one invoice_fee to the plate total. Return {tag, plate, invoices}.
Why this case matters
Fee engines bill customers in integer cents; a wrong boundary, rounding stage or cap scope silently over- or under-charges.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| fee oracle 1 | {"invoices": 3, "plate": 4359, "tag": 555} | {"invoices": 3, "plate": 3129, "tag": 555} | Failed |
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