1pub mod backend; 2 3pub fn add(left: usize, right: usize) -> usize { 4 left + right 5} 6 7#[cfg(test)] 8mod tests { 9 10 use super::*; 11 12 #[test] 13 fn it_works() { 14 let result = add(2, 2); 15 assert_eq!(result, 4); 16 } 17}