FA-66665 / Airline fare rule evaluation / Member archive

Cancellation fee eats into refundable taxes · case 05

A cheap ticket with a large penalty refunds less than its refundable government taxes.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Input {'paid' base fare,'cancel_fee','used_fare','status' UNUSED|PARTIAL,'taxes':[[code, amount, refundable, used]]}. Fare portion = paid - cancel fee - (used fare only when PARTIAL), floored at 0 before taxes are added. Taxes are refunded only if refundable and not used. Return refund rounded 2.

Why this case matters

Refund calculation must keep the penalty from consuming refundable taxes and must only deduct usage for partially flown tickets.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fee larger than fare	`0.0`	`42.2`	Failed

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