Macro egg::test_fn

macro_rules! test_fn {
    (
        $(#[$meta:meta])*
        $name:ident, $rules:expr,
        $start:literal
        =>
        $($goal:literal),+ $(,)?
        $(@check $check_fn:expr)?
    ) => { ... };
    (
        $(#[$meta:meta])*
        $name:ident, $rules:expr,
        runner = $runner:expr,
        $start:literal
        =>
        $($goal:literal),+ $(,)?
        $(@check $check_fn:expr)?
    ) => { ... };
}

Make a test function