ci: add Stryker.NET mutation testing workflow#312
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Mutation testing proves the test assertions actually catch regressions, complementing the existing line-coverage badge. Adds a standalone weekly (plus on-demand) workflow that never gates PRs. - Pin dotnet-stryker 4.14.2 as a local tool (.config/dotnet-tools.json) - Add stryker-config.json: mutate core GoogleMapsApi only on net10.0, perTest coverage, break threshold at 40 (baseline ~46%) - Add mutation.yml: weekly Monday 07:00 UTC + workflow_dispatch, publishes the score to the job summary and uploads the HTML report artifact - Ignore StrykerOutput/; document local usage in .agents/testing.md
🔬 TestGlance✅ 212 passed across 1 job — 100.0% · ⏱️ 1.9s
🟡 build — details✅ 212 passed vs
Updated 2026-06-17T07:15:30.629Z |
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Summary
Adds optional Stryker.NET mutation testing as a standalone weekly (plus on-demand) CI job that never gates PRs, complementing the existing line-coverage badge by proving the test assertions actually catch regressions.
Related issue
n/a
Changes
dotnet-stryker4.14.2 as a local tool in.config/dotnet-tools.jsonfor reproducible runs.GoogleMapsApi.Test/stryker-config.json: mutate the coreGoogleMapsApilibrary only onnet10.0,perTestcoverage, with abreakthreshold of 40 (baseline ~46%)..github/workflows/mutation.yml: runs weekly (Monday 07:00 UTC) and onworkflow_dispatch, publishes the score to the job summary and uploads the HTML report as themutation-reportartifact (no secrets needed).StrykerOutput/and document local usage in.agents/testing.md/.agents/build-release-ci.md.Test plan
dotnet tool restorethenVCR_MODE=replay dotnet strykerlocally: it built, mutated the core library, ran the offline cassette-replay suite against each mutant, and producedStrykerOutput/<ts>/reports/mutation-report.{html,md}(baseline score 46.24%), confirming the config and workflow report/artifact paths.breakgate works: a placeholder threshold of 60 correctly failed the run, so it was calibrated to 40.Checklist
dotnet formathas been run.dotnet testpasses locally (with a validGOOGLE_API_KEYfor integration tests).