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Local upload task presentation: Preview while incomplete · case 04

Preview while incomplete.

Member previewVariant 4 · 3 implementations · 80 checks per implementation

Case contract

This local upload view tracks parts and blob preview ownership, not a wire protocol. Accepted parts alone advance durable progress; cancellation aborts unaccepted sends; zero-byte parts still require acknowledgment; detached previews are released. Operation preview-while-incomplete has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
preview-while-incomplete scenario 1	`null`	`"blob:a"`	Failed

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