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test: add StrykerJS mutation testing foundation #847

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41 changes: 41 additions & 0 deletions .github/workflows/mutation-testing.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,41 @@
name: Mutation Testing

# Non-blocking: this runs on a schedule and on demand, never gates merges.
# It reports how effective the test suite is at catching real bugs (mutation
# score), scoped to util/ for now. See issue #760.
on:
schedule:
- cron: '0 6 * * 1' # Weekly on Monday 06:00 UTC
workflow_dispatch:

jobs:
mutation-test:
runs-on: ubuntu-latest
container:
# Official Node 20 image (Debian bookworm) — Node baked in, no third-party
# repo, same base used by the integration workflow.
image: 'node:20-bookworm'
steps:
- name: Install canvas build dependencies
run: |
apt-get update --yes
apt-get install --yes --no-install-recommends \
build-essential pkg-config libcairo2-dev libpango1.0-dev \
libjpeg-dev libgif-dev librsvg2-dev

- uses: actions/checkout@v4

- run: npm ci

- name: Run mutation testing on util/
run: npm run mutation-test:util
env:
NODE_ENV: test

- name: Upload mutation report
if: always()
uses: actions/upload-artifact@v4
with:
name: mutation-report
path: reports/mutation/
Comment on lines +26 to +40

@coderabbitai coderabbitai Bot Jun 26, 2026

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🔒 Security & Privacy | 🟠 Major

Pin both GitHub Actions to full SHAs.

actions/checkout@v4 and actions/upload-artifact@v4 use mutable tags. Pin them to their full 40-character commit SHAs to prevent supply-chain attacks where tags are retargeted to malicious code. Include the tag as a comment for readability.

- uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
...
- uses: actions/upload-artifact@66337390251171e342b772552734d18b63d645f9 # v4

Use Dependabot or Renovate to automate SHA updates when new releases are available.

🧰 Tools
🪛 zizmor (1.26.1)

[warning] 26-26: credential persistence through GitHub Actions artifacts (artipacked): does not set persist-credentials: false

(artipacked)

[error] 26-26: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)

(unpinned-uses)

[error] 37-37: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)

(unpinned-uses)

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In @.github/workflows/mutation-testing.yaml around lines 26 - 40, The workflow
still uses mutable GitHub Action tags in the mutation-testing job, so update the
actions referenced by actions/checkout and actions/upload-artifact to their full
40-character commit SHAs and keep the original version as an inline comment for
readability. Make this change in the mutation-testing workflow alongside the
existing run steps, preserving the same behavior while removing tag-based
supply-chain risk.

if-no-files-found: ignore
5 changes: 4 additions & 1 deletion .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -4,4 +4,7 @@ admin.macaroon
tls.cert
dist/
.history/
commands.log
commands.log
# StrykerJS mutation testing
.stryker-tmp/
reports/
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