FA-66644 / Airline fare rule evaluation / Member archive

One year of validity counted as 365 days · case 04

Tickets whose validity spans 29 February expire a day early.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Input {'issue','first_travel' (ISO or None)}. One calendar year = same month/day next year (29 Feb -> 28 Feb). Unused -> ['UNUSED', issue+1y]. First travel later than issue+1y -> ['EXPIRED_UNUSED', issue+1y] (travel on that date is still valid). Otherwise ['TRAVEL', first travel+1y].

Why this case matters

Normal ticket validity runs one year from issue until travel commences, then one year from first travel, with calendar-year and leap-day rules.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
travel commenced mid-year	`["TRAVEL", "2028-06-04"]`	`["TRAVEL", "2028-06-05"]`	Failed

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