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_write_then_drop.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 std::io::{Read, Write};

use crate::mio_uds_windows::{UnixListener, UnixStream};
use mio::event::Evented;
use mio::{Events, Poll, PollOpt, Ready, Token};
use tempfile::Builder;

#[test]
fn write_then_drop() {
    drop(::env_logger::init());
    let dir = Builder::new().prefix("uds").tempdir().unwrap();

    let a = UnixListener::bind(dir.path().join("foo")).unwrap();
    let addr = a.local_addr().unwrap();
    let mut s = UnixStream::connect(&addr.as_pathname().unwrap()).unwrap();

    let poll = Poll::new().unwrap();

    a.register(&poll, Token(1), Ready::readable(), PollOpt::edge())
        .unwrap();
    s.register(&poll, Token(3), Ready::empty(), PollOpt::edge())
        .unwrap();

    let mut events = Events::with_capacity(1024);
    while events.len() == 0 {
        poll.poll(&mut events, None).unwrap();
    }
    assert_eq!(events.len(), 1);
    assert_eq!(events.get(0).unwrap().token(), Token(1));

    let mut s2 = a.accept().unwrap().unwrap().0;

    s2.register(&poll, Token(2), Ready::writable(), PollOpt::edge())
        .unwrap();

    let mut events = Events::with_capacity(1024);
    while events.len() == 0 {
        poll.poll(&mut events, None).unwrap();
    }
    assert_eq!(events.len(), 1);
    assert_eq!(events.get(0).unwrap().
    
fn write_then_deregister() {
    drop(::env_logger::init());
    let dir = Builder::new().prefix("uds").tempdir().unwrap();

    let a = UnixListener::bind(dir.path().join("foo")).unwrap();
    let addr = a.local_addr().unwrap();
    let mut s = UnixStream::connect(&addr.as_pathname().unwrap()).unwrap();

    let poll = Poll::new().unwrap();

    a.register(&poll, Token(1), Ready::readable(), PollOpt::edge())
        .unwrap();
    s.register(&poll, Token(3), Ready::empty(), PollOpt::edge())
        .unwrap();

    let mut events = Events::with_capacity(1024);
    while events.len() == 0 {
        poll.poll(&mut events, None).unwrap();
    }
    assert_eq!(events.len(), 1);
    assert_eq!(events.get(0).unwrap().token(), Token(1));

    let mut s2 = a.accept().unwrap().unwrap().0;

    s2.register(&poll, Token(2), Ready::writable(), PollOpt::edge())
        .unwrap();

    let mut events = Events::with_capacity(1024);
    while events.len() == 0 {
        poll.poll(&mut events, None).unwrap();
    }
    assert_eq!(events.len(), 1);
    assert_eq!(events.get(0).unwrap().token(), Token(2));

    s2.write(&[1, 2, 3, 4]).unwrap();
    s2.deregister(&poll).unwrap();

    s.reregister(&poll, Token(3), Ready::readable(), PollOpt::edge())
        .unwrap();
    let mut events = Events::with_capacity(1024);
    while events.len() == 0 {
        poll.poll(&mut events, None).unwrap();
    }
    assert_eq!(events.len(), 1);
    assert_eq!(events.get(0).unwrap().token(), Token(3));

    let mut buf = [0; 10];
    assert_eq!(s.read(&mut buf).unwrap(), 4);
    assert_eq!(&buf[0..4], &[1, 2, 3, 4]);
}