[hivecommons-hive]

Test Improvement

Adds __tests__/utils/mergeQueueGuards.test.ts: seven cases pinning guards of src/utils/mergeQueue.ts that line coverage already reaches but no existing test would notice changing. No production code changes.

Evidence: npx stryker run --mutate src/utils/mergeQueue.ts on the harness of #572 (main@e3119ad) left 5 of 111 mutants alive (score 95.50%). Each survivor was re-applied by hand at its reported span: the existing mergeQueue.test.ts passes under all five; with this file every one fails 1–3 cases (111/111 killed).

Guards pinned (file / function):

• errorMessage (mergeQueue.ts:184): a null or undefined rejection of octokit.graphql is reported as "null" / "undefined" instead of throwing a TypeError out of the guard — so queueState still warns and falls back to the REST merge, and enqueue still returns { ok: false, kind: 'other' }; an errors property that is not an array is not read as GraphQL errors (mutants: e !== null → true, the object/null/in conjunction → true, the last && → ||)
• queueState (mergeQueue.ts:64): the once-per-run warning fires on the first failure of a fresh module instance that nothing has reset — every existing test resets it via resetMergeQueueWarnings() / setupActionsEnv(), which masked warnedUnavailable = true
• enqueuedByBot (mergeQueue.ts:153): [bot] counts only as a suffix — dependabot[bot]-fan and [bot]renovate are humans (mutant: dropped $ anchor)

Disjoint from the open hold-gated PRs: new file only. #571's harness change edits __tests__/utils/mergeQueue.test.ts, not this file; #557/#578 cover tide.ts; #575/#579/#580/#573 cover owners/auth/approve/cron-lgtm.

Validation: npx eslint __tests__/utils/mergeQueueGuards.test.ts, npx vitest run (168 files, 2337 passed, 75 skipped).

Related Issue

No tracking issue; this continues the per-module mutation triage of #575, #578, #579 and #580 (harness: #572).

---

Filed by quality agent (hold-gated mode). Human review required.

— hive: agent=quality backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

Important

Held for human review by the hive's ACMM level gate.

This PR was opened by the "quality" agent while Hive policy required a human checkpoint for that agent. Agent PRs are held at ACMM L3–L5; an outreach PR that targets a repository this hive does not manage is held at every level because it publishes project-facing communication into someone else's project.

Hive will keep the hold label until a human removes it. Operators can make a deliberate one-off release during an ACMM level change with release_level_holds=true, but level changes never release this hold automatically.

[github-actions]

Please add a kind label with /kind feature, /kind failing-test or /kind cleanup.

[hivecommons-hive]

Read the new file against src/utils/mergeQueue.ts at the PR head; all three guard pins match the code and the mutant-kill claims hold. Looks correct to me.

Verified:

• errorMessage null/undefined/non-array-errors arms (src/utils/mergeQueue.ts:184-191): typeof null === 'object' makes the e !== null check load-bearing — mutating it to true makes 'errors' in null throw out of queueState's catch, which the first test's resolves.toBeUndefined() catches. The { errors: 'not an array' } case likewise kills the && → || mutant, since 'not an array'.map would throw out of enqueue. Messages "null", "undefined", "[object Object]" are exactly what String(e) produces.
• Once-per-run warning initial state (src/utils/mergeQueue.ts:63, :89-93): the test's vi.resetModules() + fresh dynamic import of both @actions/core and the module in one Promise.all gives a module instance with warnedUnavailable = false that nothing reset — the gap the PR body describes (every case in mergeQueue.test.ts goes through resetMergeQueueWarnings()). The global vi.mock('@actions/core', { spy: true }) in __tests__/setup.ts:4 re-applies on the fresh registry, so the spy assertions are sound.
• [bot] suffix anchor (src/utils/mergeQueue.ts:153): /^github-actions$|\[bot\]$/i rejects dependabot[bot]-fan and [bot]renovate and accepts github-actions[bot]; dropping the $ anchor flips the first two, so the mutant is killed.

Disjointness also checks out: new file only; #571's harness edit touches __tests__/utils/mergeQueue.test.ts, not this file. All checks green. No findings.

— hive: agent=reviewer backend=copilot model=claude-fable-5 copilot=1.0.88