You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_custom_evented.rs
    path of file: ./repos/krustlet/crates/kubelet/src/mio_uds_windows/test
    
    the code of the file until where you have to start completion: use mio::event::Evented;
use mio::{Events, Poll, PollOpt, Ready, Registration, SetReadiness, Token};
use std::time::Duration;

#[test]
fn smoke() {
    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(128);

    let (r, set) = Registration::new2();
    r.register(&poll, Token(0), Ready::readable(), PollOpt::edge())
        .unwrap();

    let n = poll
        .poll(&mut events, Some(Duration::from_millis(0)))
        .unwrap();
    assert_eq!(n, 0);

    set.set_readiness(Ready::readable()).unwrap();

    let n = poll
        .poll(&mut events, Some(Duration::from_millis(0)))
        .unwrap();
    assert_eq!(n, 1);

    assert_eq!(events.get(0).unwrap().token(), Token(0));
}

#[test]
fn set_readiness_before_register() {
    use std::sync::{Arc, Barrier};
    use std::thread;

    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(128);

    for _ in 0..5_000 {
        let (r, set) = Registration::new2();

        let b1 = Arc::new(Barrier::new(2));
        let b2 = b1.clone();

        let th = thread::spawn(move || {
            // set readiness before register
            set.set_readiness(Ready::readable()).unwrap();

            // run into barrier so both can pass
            b2.wait();
        });

        // wait for readiness
        b1.wait();

        // now register
        poll.register(&r, Token(123), Ready
    
    fn with_small_events_collection() {
        const N: usize = 8;
        const ITER: usize = 1_000;

        use std::sync::atomic::AtomicBool;
        use std::sync::atomic::Ordering::{Acquire, Release};
        use std::sync::{Arc, Barrier};
        use std::thread;

        let poll = Poll::new().unwrap();
        let mut registrations = vec![];

        let barrier = Arc::new(Barrier::new(N + 1));
        let done = Arc::new(AtomicBool::new(false));

        for i in 0..N {
            let (registration, set_readiness) = Registration::new2();
            poll.register(&registration, Token(i), Ready::readable(), PollOpt::edge())
                .unwrap();

            registrations.push(registration);

            let barrier = barrier.clone();
            let done = done.clone();

            thread::spawn(move || {
                barrier.wait();

                while !done.load(Acquire) {
                    set_readiness.set_readiness(Ready::readable()).unwrap();
                }

                // Set one last time
                set_readiness.set_readiness(Ready::readable()).unwrap();
            });
        }

        let mut events = Events::with_capacity(4);

        barrier.wait();

        for _ in 0..ITER {
            poll.poll(&mut events, None).unwrap();
        }

        done.store(true, Release);

        let mut final_ready = vec![false; N];

        for _ in 0..5 {
            poll.poll(&mut events, None).unwrap();

            for event in &events {
                final_ready[event.token().0] = true;
            }

            if final_ready.iter().all(|v| *v) {
                return;
            }

            thread::sleep(Duration::from_millis(10));
        }

        panic!("dead lock?");
    }