ci: gate new code on mutation score, and run weekly - #177
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Enables diff-scoped mutation testing and a weekly CI run, matching Taure/gakudan#71. **Mutation, diff-scoped.** Only the lines a PR changes are mutated, so this gates new code without demanding a retroactive sweep of every existing test, and the job stays fast. Floor 75. Why it is worth having: on gakudan three tests were green and completely inert - each passed against a deliberately broken implementation - while every other check stayed green. Enabling this there immediately found an untested try/catch at 0/3 mutants killed. Also pins rebar3_mutate at ~> 0.5. The ~> 0.4.x line reports phantom survivors for a module with no matching _tests module instead of reporting that nothing ran, which is the same 'green means nothing' failure the plugin exists to prevent. **Weekly schedule.** paths-ignore means a docs-only stretch produces no CI run at all, so a dependency moving underneath a pin is invisible. gakudan went ~2.5 months that way and its Postgres suite rotted unnoticed (Taure/gakudan#67). compile, checks, audit, ct and sbom all run on a schedule trigger; mutate and elp-lint stay PR-only. Note: eunit mutation only reaches modules with a matching <module>_tests module, since that is how eunit discovers tests.
🟢 Code Coverage — 92.4%2612 of 2826 lines covered. 🔴 Mutation Testing — 0%0 mutants tested. 0 killed. 🟡 ELP Lint — 29 warnings34 diagnostics found. See job logs for details. |
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Enables diff-scoped mutation testing and a weekly CI run, matching Taure/gakudan#71.
Mutation, diff-scoped. Only the lines a PR changes are mutated, so this gates new code without demanding a retroactive sweep of every existing test, and the job stays fast. Floor 75.
Why it is worth having: on gakudan three tests were green and completely inert - each passed against a deliberately broken implementation - while every other check stayed green. Enabling this there immediately found an untested try/catch at 0/3 mutants killed.
Also pins rebar3_mutate at ~> 0.5. The ~> 0.4.x line reports phantom survivors for a module with no matching _tests module instead of reporting that nothing ran, which is the same 'green means nothing' failure the plugin exists to prevent.
Weekly schedule. paths-ignore means a docs-only stretch produces no CI run at all, so a dependency moving underneath a pin is invisible. gakudan went ~2.5 months that way and its Postgres suite rotted unnoticed (Taure/gakudan#67). compile, checks, audit, ct and sbom all run on a schedule trigger; mutate and elp-lint stay PR-only.
Note: eunit mutation only reaches modules with a matching _tests module, since that is how eunit discovers tests.