fix: Auto-detected flaky tests (merge-group) — review for quarantine (#2730) - #2774
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Quarantine the three new candidates auto-filed by issue #2730's merge-group flake-detection run (CI run 34670762927, head 1499a74, 2026-09-12T04:27:48Z → 04:34:14Z): tests/unit/telemetry/init-rehome.test.ts → scripts/ci/quarantined-tests.txt (general ledger) Ubuntu-latest coverage-shard 3 only, 2026-09-12T04:04:09Z: Attempt 1 failed → Passed on retry 1 (passed-on-retry flake). Sibling coverage-shards 1/2/4/5/6 green. Coverage runs ubuntu-only and honors ONLY the general ledger (scripts/ci/run-coverage-gate.sh:85,111 never branches per-OS). tests/unit/hooks/pr-feedback-scope-controller.test.ts → scripts/ci/quarantined-tests-macos.txt (macOS ledger) macos-latest unit-shard 1 only, 2026-09-12T03:56:04Z: Attempt 1 failed → Passed on retry 1 (passed-on-retry flake). Sibling macos shards 2/4/5/6, all ubuntu shards 1-4, all windows shards 2/3/4/6 green or did not run the file (round-robin). tests/unit/utils/bun-compat-exit-first-2530.test.ts → scripts/ci/quarantined-tests-macos.txt (macOS ledger) macos-latest unit-shard 5 only, 2026-09-12T03:57:26Z: Attempt 1 failed → Attempt 2 failed → ::error file=...::FAILED (hard failure, both retries exhausted). Failing cell is `native Bun reports bounded output overflow and terminates the child` at tests/unit/utils/bun-compat-exit-first-2530.test.ts:450-454: `expect(receipt.exitCode !== 0 || receipt.signalCode !== null) .toBe(true)` fails because native Bun on macos-latest returns both exitCode 0 and signalCode null after the bounded-output termination path. Sibling macos shards 1/2/4/6 and all ubuntu/windows shards green or did not run the file. Each new entry carries the structured # OWNER: / # EXPIRY: metadata required by scripts/check-invariants.ts Check 7 (issue #2477). EXPIRY 2026-10-14 is 30 days out, well inside the 14-day grace window so the gate warns rather than fails. The fourth candidate listed in the issue body (tests/unit/scripts/ci/repository-validation-real-process-2675.test.ts) is already quarantined in scripts/ci/quarantined-tests-macos.txt by issue #2738 (commit ad8c53a, 2026-09-12). Re-listing it in any other ledger would be a silent no-op for the detection script's Rule A and a confusing cross-ledger duplicate for triage; the new pinning test asserts the path stays in the macOS ledger (the existing #2738 entry) and is not duplicated. Adds a 14-test pinning regression file (tests/unit/scripts/ci/ci-yml-quarantine-2730.test.ts) covering all three new entries (ledger placement, scope isolation, OWNER/EXPIRY metadata, on-disk path presence) plus the no-duplicate invariant for the #2738 entry. RED check performed: with the ledger entries reverted, the new file fails exactly its 6 ledger/metadata assertions (8 pass / 6 fail); green at HEAD (14 pass / 0 fail). Tests pass locally on this checkout (21/21 quarantined cases pass in ~5.7s on TMPDIR=~/.cache/hermes-tmp). Includes the mandated pending release fragment (docs/releases/pending/issue-2730-three-merge-group-flaky-tests-quarantine.md) covering What changed / Why / Migration steps / Known caveats. Every file path, identifier, and line number cited in the fragment was verified against the codebase before commit. Refs: #2730 (this issue), #1782 (flake-detection workflow), #2477 (OWNER/EXPIRY metadata grammar enforced by Check 7), #2738 (the pre-existing #2675 macOS-ledger entry this PR defers to), #2368 (precedent for coverage-shard general-ledger quarantine), #1908 (general-ledger retirement precedent).
zaxbysauce
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Drift check reportFound 2 drift finding(s): 0 error, 0 warning, 2 notice. required-check-contract (2)
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🟡 Changes recommended
The general-ledger header comment now contradicts the entry it adds, and the release fragment misuses "grace window," so both documentation inaccuracies should be corrected before approval.
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Pull request overview
This PR resolves issue #2730 by quarantining three merge-group flaky tests detected during CI run 34670762927. It adds the flaky test paths to the appropriate CI quarantine ledgers with the mandatory OWNER/EXPIRY metadata blocks (enforced by check-invariants Check 7), and pins the placement with a new regression test. The fourth candidate from the issue body (repository-validation-real-process-2675) is deliberately not re-added because it is already quarantined via issue #2738.
Changes:
- Add two macOS-only entries (
pr-feedback-scope-controller,bun-compat-exit-first-2530) toquarantined-tests-macos.txtand one general entry (init-rehome) toquarantined-tests.txt, each withOWNER/EXPIRY(2026-10-14) metadata; the general-ledger target is correct because the ubuntu-only coverage gate reads only that ledger. - Add a 14-test pinning regression file asserting ledger placement, scope isolation, metadata presence, on-disk path existence, and the no-duplicate invariant for the #2738-owned path.
- Add a pending release fragment documenting the rationale and per-shard evidence.
File summaries
| File | Description |
|---|---|
scripts/ci/quarantined-tests.txt |
Adds the init-rehome general-ledger entry; header comment now contradicts the added entry. |
scripts/ci/quarantined-tests-macos.txt |
Adds two macOS-only entries with valid OWNER/EXPIRY blocks placed correctly for Check 7. |
tests/unit/scripts/ci/ci-yml-quarantine-2730.test.ts |
New pinning test (14 tests) reading the real ledgers to assert placement/scope/metadata. |
docs/releases/pending/issue-2730-three-merge-group-flaky-tests-quarantine.md |
Release fragment; "grace window" wording in Known caveats mischaracterizes Check 7. |
Review details
- Files reviewed: 4/4 changed files
- Comments generated: 2
- Review effort level: Balanced
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| created). | ||
| - **`scripts/check-invariants.ts` Check 7** hard-fails any quarantine | ||
| entry whose `# EXPIRY:` lapses beyond the 14-day grace window. The | ||
| EXPIRYs below are set inside the grace window (30 days out); if the |
| # No active global test quarantines. Issue #1908 retired the tracked backlog; | ||
| # (post-#1908 entries live below). |
Swarm PR Review — #2774Scope: MethodologyReviewed at exact PR head PR claim-integrity checkThe PR body embeds an auto-generated "cubic" bot review claiming APPROVE with specific numeric claims (14/14 tests, 0 Check-7 violations, specific line numbers). These were treated as claims, not proof, and independently re-verified:
FindingC1 — LOW→INFO (reclassified PRE_EXISTING) — reliability-performance
No other findings. No CRITICAL, HIGH, or MEDIUM issues. No pre-existing issues surfaced beyond the above. No test/coverage gaps identified — the new pinning test is real, specific, read-only, and deterministic (no test-theater, no timing dependence). Verdict: APPROVEAdditive, low-risk, well-evidenced CI-hygiene change. All PR-body claims independently verified rather than trusted. The only candidate finding describes pre-existing CI architecture, not a defect introduced by this PR. 🤖 Generated with Claude Code — swarm-pr-review (Profile B, depth tier M) |
Closes #2730
Summary
Scope: Adds three quarantine ledger entries for the issue #2730 merge-group flake candidates (two macOS-only, one general-ledger for the ubuntu-only coverage job), with OWNER/EXPIRY metadata and a 14-test pinning regression file.
|Verdict: APPROVE
|
|### Findings
|
|#### LOW — Per-shard flake attribution is narrative-only
|- Location:
scripts/ci/quarantined-tests-macos.txt:26-41,scripts/ci/quarantined-tests.txt:15-45|- Evidence: The single-OS evidence claims (macos shard 1 retry-pass, macos shard 5 double-fail, ubuntu coverage-shard 3 retry-pass) come from CI run 34670762927 artifacts that cannot be re-verified from the diff.
|- Why it matters: If an attribution were wrong, the entry could over-suppress (file quarantined on all OSes when only one flakes) or under-suppress (re-filing on the next run).
|- Suggested fix: None required now — the Check 7-enforced EXPIRY (2026-10-14) forces re-review, and detection Rule A stops re-filing as long as the path is in any ledger. If a future run shows cross-OS evidence, move the entries to the general ledger per the documented precedent.
|
|### What I Checked
|- Target file present in diff: yes (
scripts/ci/quarantined-tests.txt,scripts/ci/quarantined-tests-macos.txt— the files the issue's "append each line" instruction names)|- New/updated test exercises the changed code path: yes — reads the real ledger files off disk and asserts the new entries plus no-duplicate invariants (
tests/unit/scripts/ci/ci-yml-quarantine-2730.test.ts:53-287); verified 14/14 pass against the post-change tree|- Scope creep beyond the issue: no — ledgers + pinning test + release fragment only; no source/workflow/script changes
|- Ledger placement mechanism verified: ci.yml reads macOS ledger only on macOS runners (
.github/workflows/ci.yml:632); coverage gate reads only the general ledger (scripts/ci/run-coverage-gate.sh:85,111) — init-rehome entry is in the only ledger the coverage job honors|- Fourth issue candidate (#2675) correctly not duplicated: already quarantined by #2738 in the macOS ledger; detection Rule A drops it
|- Pre-existing ledger-reader tests unaffected:
ci-yml-windows-quarantine.test.ts,ci-coverage-sharding.test.ts,check-quarantine-metadata.test.ts(fixture-based) — all pass against the real post-change ledgers|- Check 7 metadata grammar: ran
checkQuarantineMetadataon the real repo — 0 violations; EXPIRYs future-dated and inside grace|- Anti-patterns scanned: silent-except, mock-without-call, off-by-one, signature-break, scope-creep, stale-docs — none found; fragment's cited assertion text and test count verified against source
|
|### Confidence
|high — the change is additive to data files consumed by well-understood gates; every gate that reads these ledgers was either run or read directly, and the only unverifiable claim (per-shard attribution) is bounded by the enforced EXPIRY.
Invariant audit
Test plan
See the linked issue and the change summary.