tokio/tokio/tests/io_read.rs

#![warn(rust_2018_idioms)]

use tokio::io::{AsyncRead, AsyncReadExt};
use tokio_test::assert_ok;

use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};

#[tokio::test]
async fn read() {
    #[derive(Default)]
    struct Rd {
        poll_cnt: usize,
    }

    impl AsyncRead for Rd {
        fn poll_read(
            mut self: Pin<&mut Self>,
            _cx: &mut Context<'_>,
            buf: &mut [u8],
        ) -> Poll<io::Result<usize>> {
            assert_eq!(0, self.poll_cnt);
            self.poll_cnt += 1;

            buf[0..11].copy_from_slice(b"hello world");
            Poll::Ready(Ok(11))
        }
    }

    let mut buf = Box::new([0; 11]);
    let mut rd = Rd::default();

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