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Metbcy merged 2 commits into from
Jun 2, 2026
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docs(mutation-testing): record vex round-2 clean pass (#35) #67

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docs(mutation-testing): record vex round-2 clean pass (#35)
Metbcy Jun 1, 2026
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Merge branch 'main' into docs/vex-mutants-audit-35
Metbcy Jun 2, 2026
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10 changes: 10 additions & 0 deletions docs/src/internals/mutation-testing.md
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Expand Up @@ -31,6 +31,16 @@ No test additions required. The diff engine's existing unit and property tests f

The three unviable mutants were mutations that produced code that does not compile — they're excluded from the surviving denominator because the compiler itself rejects them before the test suite runs.

### `src/vex/**` — v0.9.9 round 2

- **Total mutants:** 97
- **Caught:** 81
- **Unviable:** 16
- **Surviving:** 0
- **Surviving rate:** 0 / 81 = **0.0%**
- Date: 2026-06-01

No test additions required. The VEX module's existing unit tests fully cover the mutation surface. Note the high unviable count (16): VEX has a lot of trait-object plumbing and serde glue where mutations produce code that does not compile (correctly excluded from the surviving-rate denominator).
### `src/baseline.rs` — v0.9.9 round 2

- **Total mutants:** 54
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