Code shared from the Rust Playground

playground.rs

macro_rules! t {
    ($(#[$attr:meta])* $name:ident($pattern:expr, [$($file:expr),*])) => {
        $(#[$attr])*
        fn $name() {
            let pattern = $pattern;
            let files = vec![$(concat!(stringify!($name),"_",$file)),*];

            process_grep_case(pattern, &files);

            panic!("we want to see the output")
        }
    }

}

fn process_grep_case(pattern: &str, files: &[&str]) {
    println!("Pattern: {}", pattern);
    println!("Files:   {:?}", files)
}

t!(#[test]
test_grep_returns_result(
    "Agamemnon",
    ["iliad.txt", "paradise_lost.txt"]
));