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The "guard against zombie callbacks" subtest passed its asserts but leaked async
activity after the test ended (node:test flags that as failure). Root cause: it
mocked modal.generateTorrentMetadata / resolveUploadIdentifier, but
handleVideoSelection drives the upload through this.mediaUploader.uploadVideo —
a DIFFERENT object with its own helpers — so the mediaUploader still ran real
createTorrentMetadata()/hashing on a synthetic {name:"video.mp4"} file ("invalid
input type" async) and captureVideoMetadata() ran URL.createObjectURL(file)
("must be an instance of Blob"). Not intermittent — a consistent wrong-boundary mock.
Fix: mock at the real DI boundary — modal.mediaUploader.uploadVideo = () =>
delayedUpload (controllable pending promise) — and stub captureVideoMetadata.
Hermetic, deterministic (3/3 exit 0, # pass 3). Mutation-verified: breaking the
videoUploadId zombie guard makes the test fail. Production code untouched. See
TEST_INTEGRITY.md.
NOTE: the runner is fail-fast, so the full suite surfaces pre-existing failures one
at a time. tests/unit/hashChangeHandler.test.mjs is next (consistent AssertionError
on "loads default view if hash is empty" — likely the same stale-default bug the
sibling tests/app/hash-change-handler.test.mjs already had when TRENDING became the
logged-out default). Enumerating full scope next.
Co-Authored-By: Claude Opus 4.8 <[email protected]>