adder_one/
lib.rs

1use rand;
2
3pub fn add_one(x: i32) -> i32 {
4    x + 1
5}
6
7#[cfg(test)]
8mod tests {
9    use crate::add_one;
10
11    #[test]
12    fn it_works() {
13        assert_eq!(3, add_one(2));
14    }
15}