chore(mutants): src/diff/** audit — 0 surviving (#35, module 1/6)#61
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…0 surviving First module of the v1.0 cargo-mutants audit (#35). The diff engine's unit + property tests fully cover the mutation surface: cargo mutants --in-place --no-shuffle --file 'src/diff/**' --timeout 60 19 mutants, 16 caught, 3 unviable, 0 surviving (0.0% rate) Documents the audit methodology in docs/src/internals/mutation-testing.md so the next release-cut run is reproducible, and so the per-module results can accumulate as more modules clear. Not wired into CI per the issue body (per-PR runtime is prohibitive).
Coverage reportLine coverage: 84.6% (10029 / 11851 lines) Full lcov report available as workflow artifact coverage-lcov: download from this run. v0.9.8 introduces this report; |
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First module of the v1.0 cargo-mutants audit. Per issue #35: one PR per module, target <10% surviving rate, not a CI gate.
src/diff/**
No test additions required. The existing diff-engine unit and property tests cover the mutation surface fully. The 3 unviable mutants are excluded from the surviving denominator because they produce code the compiler rejects.
What this PR adds
docs/src/internals/mutation-testing.md— methodology + reproduction recipe + audit log table (this will accumulate one entry per module as the rest of Run cargo-mutants audit on security-critical modules (v1.0 prep) #35 lands)docs/src/SUMMARY.md— link the new page under ProjectThe other 5 modules (
src/enrich/typosquat*,src/enrich/license.rs,src/enrich/maintainer.rs,src/baseline.rs,src/vex.rs) are running in a separate worktree and will land as follow-up PRs.Closes #35 partially (diff module). Issue stays open until all six modules report.