Shepmaster's rust test timeout solution

test.rs

use std::{sync::mpsc, thread, time::Duration};

#[test]
fn oops() {
    panic_after(Duration::from_millis(100), || {
        thread::sleep(Duration::from_millis(200));
    })
}

fn panic_after<T, F>(d: Duration, f: F) -> T
where
    T: Send + 'static,
    F: FnOnce() -> T,
    F: Send + 'static,
{
    let (done_tx, done_rx) = mpsc::channel();
    let handle = thread::spawn(move || {
        let val = f();
        done_tx.send(()).expect("Unable to send completion signal");
        val
    });

    match done_rx.recv_timeout(d) {
        Ok(_) => handle.join().expect("Thread panicked"),
        Err(_) => panic!("Thread took too long"),
    }
}