testland/cargo-test
Configures and runs Rust's built-in `cargo test` - `#[test]` + `#[should_panic]` + `Result<(), E>` returns; integration tests in `tests/`; doc-tests embedded in `///` comments; `--lib` / `--bins` / `--all-targets` / `--workspace` selection; `cargo bench` (nightly) + Criterion (stable); `cargo test -- --test-threads=1` for serial; `cargo test -- --nocapture` to see println output. Use for any Rust project - testing is built into Cargo, no install needed.
75
94%
Does it follow best practices?
Run evals on this skill
Adds up to 20 points to the overall score
View guide
Passed
No findings from the security scan
coverage-and-benchmarks.mdreferences/
Coverage and benchmarks
Measurement tooling for cargo test. Both need an extra crate installed;
neither ships in the stdlib test harness.
Coverage
Stable Rust support via cargo-tarpaulin (Linux) or cargo-llvm-cov
(cross-platform):
# llvm-cov (recommended for cross-platform)
cargo install cargo-llvm-cov
cargo llvm-cov --html # HTML report
cargo llvm-cov --lcov --output-path coverage.lcov
cargo llvm-cov --fail-under-lines 80 # gate at 80%
# Or tarpaulin (Linux-only)
cargo install cargo-tarpaulin
cargo tarpaulin --out html --output-dir coverage/Benchmarks
Stable: use Criterion (mature, ergonomic):
cargo install cargo-criterion# Cargo.toml
[dev-dependencies]
criterion = "0.5"
[[bench]]
name = "math_bench"
harness = false// benches/math_bench.rs
use criterion::{black_box, criterion_group, criterion_main, Criterion};
use my_crate::math::add;
fn bench_add(c: &mut Criterion) {
c.bench_function("add 1 2", |b| b.iter(|| add(black_box(1), black_box(2))));
}
criterion_group!(benches, bench_add);
criterion_main!(benches);cargo bench
# Or via criterion CLI for richer reports:
cargo criterionNightly Rust has built-in #[bench] (cargo +nightly bench); not
recommended for CI (requires nightly toolchain).
Sources
- crates.io/crates/cargo-llvm-cov - coverage tool
- bheisler.github.io/criterion.rs - Criterion docs