FA-94743 / Exam timetabling constraints / Member archive

Withdrawn exams produce no notification · case 03

Candidates are not told an exam was removed from the timetable.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

old/new timetables map exam -> [period, room]; rooms room -> venue; enrol [student, exam] rows (may repeat). Reasons: added, removed, moved (period changed; takes precedence), venue (same period, different venue). A room change within the same venue needs no notice. Return distinct [student, exam, reason] rows sorted by student, exam.

Why this case matters

Republishing a timetable must notify exactly the affected candidates.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: removed exams 1	`[["s3", "PHYS110", "added"], ["s4", "MATH101H", "added"], ["s4", "PHYS110", "added"]]`	`[["s1", "BIO130", "removed"], ["s3", "PHYS110", "added"], ["s4", "BIO130", "removed"], ["s4", "MATH101H", "added"], ["s4", "PHYS110", "added"]]`	Failed

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