A test suite is a collection of automated tests that collectively validate a software component. In Rust, tests commonly live in a tests module marked with #[cfg(test)], keeping them out of production builds while Cargo compiles and runs them when requested. section 7.1
A minimal suite
A library can test that 2 + 2 equals 4, then run the suite with cargo test. A deliberately incorrect assertion demonstrates failure reporting; --nocapture displays test output.










