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The existing mutation workflow is manual and mutates a whole folder, which takes hours, so nothing about a pull request's own test quality gets checked before it merges. This adds the diff-scoped half, following Google's approach in "State of Mutation Testing at Google": mutate what the change touched, not the codebase. scripts/mutation_diff_scope.py reads the diff against the merge base, rewrites [tool.mutmut] so paths_to_mutate is the changed production files and tests_dir is the tests mirroring them, then emits mutant-name globs for the functions holding the changed lines. mutmut trampolines per function and per method, so that is the smallest unit it can be asked to run. The new workflow is advisory: results land in the job summary and an artifact, and nothing blocks a merge. A --max-functions cap bounds the worst case and prints what it dropped rather than truncating quietly. The report script now counts only the mutants a run actually executed, since a diff-scoped run leaves everything else at "not checked" and the old summary folded those into the score. |
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| scripts | ||
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| ci-coverage-allowlist.yml | ||
| CODEOWNERS | ||
| dependabot.yaml | ||
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| FUNDING.yml | ||
| pull_request_template.md | ||
| template.yaml | ||
