Mark
73eb9b654c
Replace harness-page-mutation approach with verbatim port of the canonical cs-injection-world pattern from Plan 03-02 (assertA30) + Plan 03-03 (assertA31): - chrome.tabs.create(https://example.com/, active:true) opens probe tab where content script + rrweb's record() attach normally (chrome-extension:// is NOT covered by <all_urls> per Chrome match-pattern spec; was the root flake cause) - 1.5s tab-attach + 11s segment-settle waits (canonical A27/A30/A31) - chrome.scripting.executeScript world: 'ISOLATED' injects a sentinel- bearing <div> (textContent='a29-mutation-sentinel') into document.body — rrweb's MutationObserver lives in the same ISOLATED world so the IncrementalSnapshot's data.adds[*].node.textContent will carry the sentinel - 500ms MutationObserver-enqueue settle - SAVE_ARCHIVE while probe tab is active (SW harvests rrweb/session.json from there) - try/finally chrome.tabs.remove with silent-ignore (T-02-04-04 parity) A29 constants block extended: A29_TAB_NAVIGATION_WAIT_MS, A29_PROBE_TAB_URL, A29_MUTATION_SENTINEL, A29_PROBE_DIV_ID. This closes the documented ~2/3 success-rate flake from Plans 03-02 + 03-03 where A29 "passed" by reading iana.org leftover DOM mutations from A27/A28's probe tabs — a real rrweb regression at src/content/index.ts:284 would have been masked because iana.org's home page emits plenty of mutations during normal rendering. Tier-1 FORBIDDEN_HOOK_STRINGS unchanged at 12; assertA30 + assertA31 untouched; __mokoshHarness wiring unchanged. Host-side driveA29 strict-sentinel filter lands in Task 2. Verify: - npx tsc --noEmit → 0 - npm run build:test → 0 - grep -c 'A29_MUTATION_SENTINEL' tests/uat/extension-page-harness.ts → 3 - grep -nE "world: 'ISOLATED'" tests/uat/extension-page-harness.ts → 3 call sites (A29 + A30 + A31) — ISOLATED parity per RESEARCH Pitfall 5
Mokosh UAT harness (Plan 01-11)
Puppeteer-driven Node script that runs 14 assertions end-to-end against a real Chrome instance loaded with the Mokosh extension. Replaces Plan 01-09 Task 5's operator-empirical functional verification (the operator retains only step 1 — build — and step 14 — brand/design acceptance).
Quick start
npm run test:uat
This builds dist-test/ (the hook-enabled bundle) and runs the harness.
Exit 0 means all 14 assertions passed. Final line: UAT harness: 14/14 assertions passed.
Local-debug mode
HEADLESS=0 npm run test:uat
Opens a real Chrome window so you can watch the picker auto-accept, the badge transitions, the popup appear, etc.
Developer iteration tricks
# Skip the production build inside assertion 0 (uses existing dist/):
SKIP_PROD_REBUILD=1 npm run test:uat
# Run the harness against an existing dist-test/ (skip npm run build:test):
npx tsx tests/uat/harness.test.ts
Assertion catalog
| # | Title | Bug class | Hook used |
|---|---|---|---|
| 0 | Production bundle has no test-hook leaks | T-1-11-01 | filesystem grep |
| 1 | SW bootstrap → setIdleMode | — | sw.evaluate |
| 2 | Toolbar onClicked-idle → REC + popup | — | triggerExtensionAction |
| 3 | Offscreen displaySurface === monitor | D-15 | __mokoshTest.getCurrentStream |
| 4 | Toolbar onClicked-recording → popup, no new offscreen | — | targets count |
| 5 | SAVE_ARCHIVE → download fires | — | downloads polling |
| 6 | BUG B: simulateUserStop → badge OFF + no recovery notif | b9eeeeb |
dispatchEvent('ended') |
| 7 | RECORDING_ERROR codec-unsupported → ERR + recovery notif | — | sendMessage |
| 8 | BUG A: onStartup → mokosh-startup- notification creates | a881bf0 |
__mokoshTest.handlers.onStartup |
| 9 | Icon file sizes meet floors | Bug A precondition | sw.evaluate(fetch) |
| 10 | Manifest has notifications + 3 icons | Bug A precondition | chrome.runtime.getManifest |
| 11 | 35s recording → segments.length >= 3 | D-13 | __mokoshTest.getSegmentCount |
| 12 | ffprobe on extracted webm exits 0 | Plan 01-08 | jszip + execFile |
| 13 | Archive shape — video + meta.json version match | Plan 01-07 | jszip |
Failure isolation
Single browser, serial assertions, bail on first failure for setup- dependent assertions (assertion 0 abort means refusing to launch a potentially-leaky bundle). Per-assertion bail keeps the diagnostic output unambiguous — see RESEARCH §5 + Plan 01-11 open-question resolution 4.
On failure, the harness dumps the last 30 lines of SW console + last 30 lines of offscreen console (captured live during the run) to stderr BEFORE rethrowing — gives you contextual triage without needing to re- run with debug logging.
Known gotchas
Locale-specific picker auto-accept
The --auto-select-desktop-capture-source=Entire screen Chrome flag
auto-accepts the screen-share picker. The string "Entire screen" is
en_US-specific. If your Chrome is set to a non-English locale, the
picker option label will differ and the auto-accept will silently fail
(picker stays open; assertion 2 times out).
Fallback: switch your Chrome user-data-dir's locale to en_US for
harness runs, OR adjust the launch arg in tests/uat/lib/launch.ts to
match your locale's equivalent string.
dev-dep Chromium binary size
puppeteer pulls a ~150 MB Chromium binary at npm install time. CI
must accept this. Production npm install --omit=dev skips it cleanly.
Xvfb is NOT required
Per Plan 01-11 RESEARCH §3 empirical probes against Chrome 148, the
--headless=new mode handles screen capture without Xvfb on Linux CI
runners. If a future Chrome regresses this, Xvfb :99 & DISPLAY=:99 npm run test:uat is the fallback.
CI runner screen-capture concern
The 35s recording assertion (A11) captures whatever is on screen during that window. CI MUST run the harness in an isolated container with no concurrent workload — see T-1-11-02 in Plan 01-11's threat model.
Real Chrome download (assertion 5 → A12)
The harness configures per-page download behavior via CDP to a fresh
os.tmpdir()/mokosh-uat-downloads-* directory; downloads are NOT
written to your real ~/Downloads. The temp directory is deleted by OS
tmpdir GC.