1pub mod log { 2 pub fn info(msg: &str) { 3 println!("info: {}", msg); 4 } 5} 6 7#[cfg(test)] 8mod tests { 9 #[test] 10 fn it_works() { 11 let result = 2 + 2; 12 assert_eq!(result, 4); 13 } 14}