1pub fn add(left: u64, right: u64) -> u64 { 2 left + right 3} 4 5#[cfg(test)] 6mod tests { 7 use super::*; 8 #[test] 9 fn it_works() { 10 11 12 let result = add(2, 2); 13 assert_eq!(result, 4); 14 } 15}