FA-8727 / Notification interfaces / Member archive

Toast queue lifecycle: Clear-all removes only the newest toast · case 02

Clear-all removes only the newest toast.

Member previewVariant 2 · 3 implementations · 10 checks per implementation

Case contract

Toast IDs deduplicate additions; equal content may belong to distinct IDs; keep newest within capacity; update/dismiss target one ID; clear removes all.

Why this case matters

A deterministic model of toast queue lifecycle; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
clear	`[{"id": "a", "message": "a"}]`	`[]`	Failed

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