test_lib_rahul/
lib.rs

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/// Hope the compiler will forgive us
/// for our mistakes
 
pub fn sub(left: i32, right: i32) -> i32 {
    left - right
}

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

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

    #[test]
    fn it_works() {
        let result = add(2, 2);
        assert_eq!(result, 4);
        let result_2 = sub(2, 2);
        assert_eq!(result_2, 0);
    }
}