[easonLiangWorldedtech]

What

Use plugin-side vitest related-test discovery for the extension package in scripts/stryker-diff.mjs (vitestRelated: true / discoverRelatedTests: false), instead of an explicit STRYKER_TEST_FILES list.

Why

stryker-js 10.0.0 plans static mutants with runtime activation when an explicit test-file list is supplied (stryker-mutator/stryker-js#6144, #6209). The vitest plugin can only apply that activation after top-level code has run, which produces false Survived results on changed-code mutation runs. Plugin-side discovery avoids the explicit list and the mis-activation.

This was previously mixed into #1522 (DTE-2 thinking effort). It is unrelated to that feature and is extracted here so it can be reviewed, reverted, or landed on its own once the upstream planner fix lands.

Verification

• node --test scripts/stryker-diff.test.mjs: 44 tests, 0 failures (the manifest expectation for the extension package was updated alongside the config).

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📝 Summary

Summary by CodeRabbit

• Chores
  • Updated how automated tests select related tests for extension packages.
  • No user-facing changes are included in this release.

The extension package’s Stryker configuration now enables Vitest-related test selection and disables explicit related-test discovery. The buildManifest test expects these settings.

Changes: Extension test discovery

Layer / File(s)	Summary
Configure and verify extension test discovery scripts/stryker-diff.mjs, scripts/stryker-diff.test.mjs	The extension configuration enables vitestRelated and disables discoverRelatedTests. The test assertions expect these values.

Priority: Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Possibly related issues

• Zoo-Code-Org/Zoo-Code#2060 — Concerns extension mutation-gate runs and changes to scripts/stryker-diff.mjs; this PR changes related-test discovery for that gate.
• Zoo-Code-Org/Zoo-Code#2201 — Concerns classifying gemini.ts mutants with the extension mutation gate; this PR changes the gate’s test discovery.
• Zoo-Code-Org/Zoo-Code#2050 — Defines the changed-code mutation gate and identifies scripts/stryker-diff.mjs; this PR changes the gate’s test discovery.
• Zoo-Code-Org/Zoo-Code#2147 — Requires rerunning the extension mutation gate; this PR changes the related-test discovery used by the gate.

Suggested labels: awaiting-coderabbit

Merge Risk: Low · up to 363d2

The change is mergeable, but a focused mutation fixture would provide confidence that the false-survivor regression is actually prevented.

Pre-merge checks: 7 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Description check		The description explains what changed, why the change is needed, key configuration details, upstream issue references, and test results. It does not provide the required approved issue link in the "Cl…	Add the approved issue reference in the "Related GitHub Issue" section, complete the pre-submission checklist, and include the required documentation impact and additional notes sections as applicable.

Passed checks: 7 passed

Check name	Status	Explanation
Title check		The title clearly states the main change: enabling plugin-side related-test discovery for the extension package. It is concise and specific.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Regression Evidence		The changed extension behavior has focused unit coverage. PACKAGE_CONFIGS now sets vitestRelated: true and discoverRelatedTests: false; the buildManifest test asserts both values on the genera…
Security Boundaries		PASS: The changed path only changes PACKAGE_CONFIGS.extension from explicit related-test discovery to Vitest plugin-side discovery (scripts/stryker-diff.mjs:56-67) and updates its test expectation…
Persistence Integrity		No changed persistence path exists. The PR changes only PACKAGE_CONFIGS flags for the extension package and matching manifest assertions. buildManifest copies these flags into the in-memory packag…
Lifecycle Resource Cleanup		PASS. The pull request changes only PACKAGE_CONFIGS flags for the extension package and the matching manifest assertions. The changed path sets vitestRelated: true and `discoverRelatedTests: fal…

Full details: Regression Evidence

Explanation

The changed extension behavior has focused unit coverage. PACKAGE_CONFIGS now sets vitestRelated: true and discoverRelatedTests: false; the buildManifest test asserts both values on the generated extension entry. Existing shouldUseVitestRelated tests cover the explicit-list, enabled, disabled, and default branches. No UI change is present.

Full details: Security Boundaries

Explanation

PASS: The changed path only changes PACKAGE_CONFIGS.extension from explicit related-test discovery to Vitest plugin-side discovery (scripts/stryker-diff.mjs:56-67) and updates its test expectation. The execution path passes fixed configuration values to Stryker (scripts/stryker-diff.mjs:418-433); it does not expose secrets or PII, execute newly trusted input, or bypass approval or allowlist controls.

Full details: Persistence Integrity

Explanation

No changed persistence path exists. The PR changes only PACKAGE_CONFIGS flags for the extension package and matching manifest assertions. buildManifest copies these flags into the in-memory package entry; runManifest skips explicit test-file discovery when discoverRelatedTests is false, and runStryker passes the related-test setting to Stryker. No changed write, await, atomicity, rollback, or partial-failure behavior is present.

Full details: Lifecycle Resource Cleanup

Explanation

PASS. The pull request changes only PACKAGE_CONFIGS flags for the extension package and the matching manifest assertions. The changed path sets vitestRelated: true and discoverRelatedTests: false; runManifest therefore skips the explicit discoverRelatedTestFiles subprocess and passes the configuration to Stryker. No changed listener, watcher, provider, timer, task, or cancellation/disposal path can leak a resource or duplicate work.

Full details: Description check

Explanation

The description explains what changed, why the change is needed, key configuration details, upstream issue references, and test results. It does not provide the required approved issue link in the "Closes: #" format, and it omits the required pre-submission checklist and other template sections.

Resolution

Add the approved issue reference in the "Related GitHub Issue" section, complete the pre-submission checklist, and include the required documentation impact and additional notes sections as applicable.

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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Review status

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @scripts/stryker-diff.test.mjs:
- Around line 260-261: Add a focused Stryker/Vitest fixture alongside the
manifest assertions in the test containing `extension.discoverRelatedTests` and
`extension.vitestRelated`. Run the fixture with plugin-side related-test
discovery and assert that a killable static mutant is not reported as Survived;
keep the existing manifest assertions.

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Files selected for processing: 2

• scripts/stryker-diff.mjs
• scripts/stryker-diff.test.mjs

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[easonLiangWorldedtech]

Disposition: the flag flip is covered by the manifest test; a nested Stryker run belongs to mutation-diff (evidence)

This PR is deliberately a config flip (extension package: vitestRelated: true / discoverRelatedTests: false) extracted from #1522. The request asks for a focused Stryker/Vitest fixture that runs plugin-side discovery and asserts a killable static mutant is not Survived.

Why it is not added here:

• Such a fixture needs a real nested @stryker-mutator/core run (Stryker 10 + the vitest runner) against a throwaway project. That is a second mutation run inside the unit CI, takes minutes and is flaky by nature — the repository's own mutation protocol keeps Stryker runs in the dedicated mutation-diff workflow (scripts/stryker-diff.mjs), which is exactly where this config is consumed and where the real behaviour is exercised on every PR.
• The manifest test added in this PR pins the decision the config change encodes (extension.vitestRelated === true, extension.discoverRelatedTests === false), so a revert to the explicit-test-file discovery fails fast.
• The behaviour being worked around is an upstream planner defect (Static mutants are activated too late when --testFiles produces a test filter stryker-mutator/stryker-js#6144, #6209): an explicit STRYKER_TEST_FILES list makes Stryker 10 plan static mutants with runtime activation, producing false Survived results. A local fixture asserting the workaround would encode upstream's defect rather than our contract.

If maintainers want a regression harness for the upstream fix, the right place is a separate mutation-diff self-test (or the upstream repo) once the planner fix lands and this flip is reverted. Keeping this PR a clean, revertible chore.

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