tokio/tokio-io/tests/read_to_string.rs

#![warn(rust_2018_idioms)]
#![feature(async_await)]

use tokio_io::AsyncReadExt;
use tokio_test::assert_ok;

#[tokio::test]
async fn read_to_string() {
    let mut buf = String::new();
    let mut rd: &[u8] = b"hello world";

    let n = assert_ok!(rd.read_to_string(&mut buf).await);
    assert_eq!(n, 11);
    assert_eq!(buf[..], "hello world"[..]);
}