# Coverage Loop

> Iteratively improve Fallow Rust test coverage with cargo-llvm-cov, prioritizing meaningful untested behavior and preserving runtime correctness.

- Skill: `fallow-rs/coverage-loop-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add fallow-rs/coverage-loop-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/fallow-rs/coverage-loop-2/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: fallow-rs (https://skillmd.com/u/fallow-rs)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/fallow-rs/coverage-loop-2

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# Coverage loop

1. Capture a coverage baseline with the repository-supported command.
2. Select uncovered behavior by risk, not by easiest lines.
3. Add behavior-focused tests that survive refactors.
4. Re-run targeted tests and the same coverage command.
5. Keep only tests that improve meaningful coverage or lock a real invariant.
6. Repeat until the selected risk area is covered or remaining gaps require a
   separate design change.
7. Run `review`.

Do not add assertions that merely execute code without checking behavior.