Code Coverage

Hunch tracks line, function, and region coverage via cargo-llvm-cov. Run locally during release prep or when working on test-quality improvements.

The dedicated CI Coverage job that previously ran on every PR was removed in #216 as part of trimming over-engineered CI for a hobby-scale crate. The tooling and the local workflow are unchanged.

Current baseline

Captured against main on 2026-04-18 (post v1.1.8, after PR #167):

Dimension	Coverage	Total	Missed
Lines	94.34%	15,030	851
Functions	95.54%	1,054	47
Regions	94.63%	8,571	460

Re-measure with:

cargo llvm-cov --workspace --summary-only

Lowest-covered files (line %)

Useful targets for the next round of test-quality work (and for the upcoming mutation-testing epic, #146):

File	Line %	Missed
`src/properties/language.rs`	79.67%	37
`src/properties/date.rs`	89.00%	55
`src/properties/title/strategies/unclaimed_bracket.rs`	90.91%	8
`src/properties/part.rs`	91.29%	37
`src/properties/subtitle_language.rs`	91.99%	45
`src/properties/website.rs`	93.30%	14

Everything else is ≥ 94% line coverage. 273 of 282 unit tests pass on every fixture; the missed lines are concentrated in a handful of long-tail edge branches (rare locale codes, malformed date fragments, etc.).

Running locally

Install once:

cargo install cargo-llvm-cov --locked
rustup component add llvm-tools-preview

Generate a quick summary:

cargo llvm-cov --workspace --summary-only

Generate a full HTML report (open in browser):

cargo llvm-cov --workspace --html --open

Generate the LCOV file CI uploads (for IDE coverage gutters or external tools):

cargo llvm-cov --workspace --lcov --output-path lcov.info

Roadmap

Long-term ideas, not actively planned post-#216:

Codecov.io / Coveralls integration — the LCOV file is in the right shape if anyone wants to wire it up. Local-only for now.
Branch coverage — cargo-llvm-cov reports it; the line-coverage baseline above is the project’s primary signal.

Notes

Why not 100%: parser code intentionally has permissive fallback branches (e.g., “we couldn’t decide, return the empty result”) that aren’t worth contorting tests to hit. ≥ 94% is the realistic ceiling for this codebase.