pub mod sub;
pub fn add(a: i32, b: i32) -> i32 {
    a + b
}

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
    #[test]
    fn add_test() {
        assert_eq!(2, super::add(1, 1));
    }
    #[test]
    fn add_sub() {
        assert_eq!(0, crate::sub::sub(1, 1));
    }
}