ascii_sum.rs

// Lowercase letters start at 97 => 1
// Max is 122 for z => 26
pub fn ascii_sum(string: &'static str) -> u32 {
    string.bytes().map(|char| {
        (char - 96) as u32
    }).sum::<u32>()
}


fn main() {
    println!("helloworld")
}

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

    #[test]
    pub fn empty() {
        assert_eq!(ascii_sum(""), 0)
    }
    
    #[test]
    pub fn a() {
        assert_eq!(ascii_sum("a"), 1)
    }
    
    #[test]
    pub fn z() {
        assert_eq!(ascii_sum("z"), 26)
    }
    
    #[test]
    pub fn cab() {
        assert_eq!(ascii_sum("cab"), 6)
    }
    
    #[test]
    pub fn excellent() {
        assert_eq!(ascii_sum("excellent"), 100)
    }
    
    #[test]
    pub fn long() {
        assert_eq!(ascii_sum("microspectrophotometries"), 317)
    }
}