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#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]
use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf};
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 ReadBuf<'_>,
) -> Poll<io::Result<()>> {
assert_eq!(0, self.poll_cnt);
self.poll_cnt += 1;
buf.put_slice(b"hello world");
Poll::Ready(Ok(()))
}
}
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"[..]);
}
struct BadAsyncRead;
impl AsyncRead for BadAsyncRead {
fn poll_read(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<io::Result<()>> {
*buf = ReadBuf::new(Box::leak(vec![0; buf.capacity()].into_boxed_slice()));
buf.advance(buf.capacity());
Poll::Ready(Ok(()))
}
}
#[tokio::test]
#[should_panic]
async fn read_buf_bad_async_read() {
let mut buf = Vec::with_capacity(10);
BadAsyncRead.read_buf(&mut buf).await.unwrap();
}
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