sneak 1f894bad0e Add failing tests for download truncation detection and atomic writes ...

Covers, for both downloadFile and downloadThumbnail:

- a multi-chunk body whose TAG_FINAL chunk never arrived is rejected
  with a truncation error;
- an empty body is rejected as truncation rather than written as a
  zero-byte file;
- after a truncation or chunk-authentication failure the destination
  path does not exist and no temporary scratch file is left behind;
- an existing file at the destination survives a failed download
  byte for byte, and is replaced atomically by a successful one;
- the existing success cases still produce identical bytes and an
  identical DownloadResult.

Adds an encryptMultiChunkBody helper that frames leading chunks at
exactly STREAM_CHUNK_SIZE so the downloader's fixed-size re-splitting
lines up, plus a multi-chunk success case as the positive control.

Also pins the new STREAM_TAG_FINAL crypto export against libsodium's
own constant, since it must be declared as a literal: libsodium
attaches its constants only after sodium.ready resolves, well after
this library's modules are evaluated.

These fail until the implementation lands, per the repo's TDD workflow.

2026-08-09 01:53:43 +00:00

7.7 KiB

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