rustlings/exercises/quiz4.rs

// quiz4.rs
// This quiz covers the sections:
// - Modules
// - Macros

// Write a macro that passes the quiz! No hints this time, you can do it!

mod m {
    #[macro_export]
    macro_rules! my_macro {
        ($val:expr) => {
            {
                let mut s = String::from("Hello ");
                s.push_str($val);
                s
            }
        //    format!("Hello {}",$val)
        };
    }
}

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

    #[test]
    fn test_my_macro_world() {
        my_macro!("world!");
        assert_eq!(my_macro!("world!"), "Hello world!");
    }

    #[test]
    fn test_my_macro_goodbye() {
        assert_eq!(my_macro!("goodbye!"), "Hello goodbye!");
    }
}