Guides test-first Rust development with red-green-refactor cycles, fakes, and async test patterns.
npx skills add https://github.com/po4yka/rust-skills --skill rust-tdd-po4yka
Please help me install this Agent Skill. Skill: rust-tdd Source: https://github.com/po4yka/rust-skills/tree/main/skills/rust-tdd Command: npx skills add https://github.com/po4yka/rust-skills --skill rust-tdd-po4yka
High-intent search queries and answers about installing and using this skill.
Write one failing test that asserts the predicted failure, run it with cargo nextest run --locked -p <crate> to confirm the RED, then write the minimum implementation to pass. Run cargo fmt, clippy with -D warnings, and the test suite once before each commit.
Use a hand-written fake implementing the seam trait with a typed FaultQueue of FaultSpec entries. Enqueue OneShot or Persistent faults targeting specific operations, then assert both the error mapping and that the injected fault actually fired.
Yes, #[tokio::test(start_paused = true)] pauses the clock so timers advance instantly when no task is ready. It requires the tokio test-util feature in dev-dependencies and the current-thread runtime flavor.
A filter matching nothing is a false green: cargo test prints 0 passed with N filtered out and exits 0. cargo-nextest instead prints an error and exits 4, so always read the test count on filtered runs.
This skill does not cover loom concurrency testing, proptest property testing, fuzzing, mutation testing, or golden-file harness mechanics. Use the rust-test-tools skill for those techniques instead.
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