1 #![warn(rust_2018_idioms)]
2 #![cfg(feature = "full")]
3 
4 use tokio::io::{self, AsyncReadExt, AsyncWriteExt};
5 use tokio::net::{TcpListener, TcpStream};
6 use tokio::sync::oneshot;
7 use tokio_test::assert_ok;
8 
9 #[tokio::test]
echo_server()10 async fn echo_server() {
11     const ITER: usize = 1024;
12 
13     let (tx, rx) = oneshot::channel();
14 
15     let srv = assert_ok!(TcpListener::bind("127.0.0.1:0").await);
16     let addr = assert_ok!(srv.local_addr());
17 
18     let msg = "foo bar baz";
19     tokio::spawn(async move {
20         let mut stream = assert_ok!(TcpStream::connect(&addr).await);
21 
22         for _ in 0..ITER {
23             // write
24             assert_ok!(stream.write_all(msg.as_bytes()).await);
25 
26             // read
27             let mut buf = [0; 11];
28             assert_ok!(stream.read_exact(&mut buf).await);
29             assert_eq!(&buf[..], msg.as_bytes());
30         }
31 
32         assert_ok!(tx.send(()));
33     });
34 
35     let (mut stream, _) = assert_ok!(srv.accept().await);
36     let (mut rd, mut wr) = stream.split();
37 
38     let n = assert_ok!(io::copy(&mut rd, &mut wr).await);
39     assert_eq!(n, (ITER * msg.len()) as u64);
40 
41     assert_ok!(rx.await);
42 }
43