//! Small arithmetic helpers.
//!
//!     use demo_lib::add;
//!
//!     assert_eq!(add(2, 3), 5);

pub fn add(left: u64, right: u64) -> u64 {
    left + right
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn adds_small_numbers() {
        assert_eq!(add(2, 2), 4);
    }

    #[test]
    fn adds_zero() {
        assert_eq!(add(7, 0), 7);
    }
}