Rust study : constants and static

const.rs

/*
The rust by example ko https://hanbum.gitbooks.io/rustbyexample/content/custom_types/constants.html
compiled on https://play.rust-lang.org/
result:
running 1 test
test tests::const_test ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
*/

// 글로벌은 모든 다른 범위 외부에서 선언된다.
static LANGUAGE: &'static str = "Rust";
const THRESHOLD: i32 = 10;

fn is_big(n: i32) -> bool {
    n > THRESHOLD
}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[test]
    fn const_test() {
        let n = 16;
        assert_eq!(LANGUAGE.eq("Rust"), true);
        assert_eq!(THRESHOLD, 10);
        assert_eq!(is_big(11), true);
        assert_eq!(is_big(9), false);
    }
}