[Fix] Preserve coverage caches for verifier-only changes - #1649
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📝 SummarySummary by CodeRabbit
WalkthroughThe change adds a cache-input verification test, excludes four verifier scripts from four Turbo coverage tasks, and runs the verification command after coverage processing and before Turbo cache publication. ChangesCoverage cache verification
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant CodeQA as Code QA
participant Verifier as verify-coverage-cache-inputs.mjs
participant Turbo
participant Workspace
CodeQA->>Verifier: Run verification command
Verifier->>Turbo: Request coverage lane hashes
Verifier->>Workspace: Temporarily mutate probe files
Verifier->>Turbo: Recompute lane hashes
Turbo-->>Verifier: Return changed lanes
Verifier->>Workspace: Restore probe files
Verifier-->>CodeQA: Report validation result
Suggested reviewers: Merge Risk: ⚪ Minimal · up to No actionable merge-blocking risk is identified. 🚥 Pre-merge checks | ✅ 7 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (7 passed)
Full details: Description checkExplanation The description explains the implementation, rationale, impact, and testing intent, but it does not use the required template sections. It omits the linked issue, Test Procedure, Pre-Submission Checklist, Documentation Updates, and Additional Notes or equivalent checklist information. Resolution Add an approved issue reference under Related GitHub Issue, organize the content under Description and Test Procedure, complete the Pre-Submission Checklist, state whether documentation updates are required, and provide any required reviewer notes and contact information.
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Codecov Report✅ All modified and coverable lines are covered by tests. 📢 Thoughts on this report? Let us know! |
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Addressed all valid current-head findings in
Validation passed: isolated cache-input contract (all three nested assertions), coverage contract, merged-LCOV suite (3/3), full |
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Inline comments:
In @.github/workflows/code-qa.yml:
- Around line 253-254: Move the “Verify coverage cache inputs” workflow step to
immediately before “Save Turbo cache,” after coverage processing, so validation
completes before any cache entries are saved. Preserve the existing verifier
command and cache conditions, and keep the step’s placement relative to the
named “Save Turbo cache” step.
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⏰ Context from checks skipped due to timeout. (4)
- GitHub Check: e2e-mock
- GitHub Check: platform-unit-test (windows-latest)
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Require full commit SHA pins, least-privilege permissions, safe expression and shell interpolation, and trusted metadata handling.
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Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.
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🔇 Additional comments (2)
src/package.json (1)
446-446: LGTM!.github/workflows/code-qa.yml (1)
176-180: LGTM!Also applies to: 192-194, 201-204, 243-243
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What changed
--no-daemonso Windows cannot reuse stale file observations between probes.merge:coveragefrom [Fix] Patch coverage drops despite dedicated lane tests #1650 alongsideverify:coverage-cache-inputs.Why this change was made
Changes confined to coverage verification currently invalidate every general extension coverage lane on Windows and Linux, forcing expensive test work whose result cannot change. The latest post-#1644 Windows run spent 5:35 in extension coverage within an 8:39 job, including 1:26 of setup and 0:34 of Turbo cache restore; avoiding those false misses is the smallest evidence-backed optimization.
Earlier verifier versions mutated tracked files in the active checkout and relied on restoration. Windows also retained transient mutations through Turbo's daemon-backed file observation after restoration. A disposable worktree plus daemon-free probes removes both hazards without weakening the cache-boundary assertions. Running the contract before cache save ensures a failed assertion cannot publish entries under an invalid input definition.
Impact
Verifier-only pull requests can reuse all five extension coverage lane results while still executing the verifier and its cache contract. This does not skip tests or weaken merge-queue coverage safety: result-affecting production, configuration, dependency, and lane-owned test inputs remain hashed and are exercised by positive invalidation checks.
The isolated verifier adds bounded overhead to cached runs. The validated hosted Windows run before the latest ordering fix completed below five minutes; current-head checks will remeasure the final ordering and cleanup changes.