coder-rust-testing

<skill_overview> Write fast, reliable, and maintainable Rust tests Writing unit tests Adding integration tests Testing async code Improving test reliability The Rust Book - Testing </skill_overview> <test_structure> Use #[cfg(test)] mod tests in the same module for unit tests Put integration tests in tests/ as separate crates Keep tests independent and deterministic </test_structure> <arrange_act_assert> Structure each test with Arrange, Act, Assert #[test] fn add_two_numbers_returns_sum() { let result = add(2, 3); assert_eq!(5, result); } </arrange_act_assert> <async_tests> Use an async test harness provided by your runtime Avoid sleeps; use timeouts and deterministic inputs </async_tests> Use assert!, assert_eq!, assert_ne! for clarity Use matches! for enum pattern assertions <anti_patterns> Tests that depend on execution order Hitting real external services in unit tests Global mutable state shared across tests </anti_patterns>