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#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]
use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf};
use tokio_test::assert_ok;
use futures::future::poll_fn;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
#[tokio::test]
async fn read_buf() {
struct Rd {
cnt: usize,
}
impl AsyncRead for Rd {
fn poll_read(
mut self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<io::Result<()>> {
self.cnt += 1;
buf.put_slice(b"hello world");
Poll::Ready(Ok(()))
}
}
let mut buf = vec![];
let mut rd = Rd { cnt: 0 };
let n = assert_ok!(rd.read_buf(&mut buf).await);
assert_eq!(1, rd.cnt);
assert_eq!(n, 11);
assert_eq!(buf[..], b"hello world"[..]);
}
#[tokio::test]
async fn poll_read_buf() {
struct Rd {
cnt: usize,
}
impl AsyncRead for Rd {
fn poll_read(
mut self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<io::Result<()>> {
self.cnt += 1;
buf.put_slice(b"hello world");
Poll::Ready(Ok(()))
}
}
let mut buf = vec![];
let mut rd = Rd { cnt: 0 };
let res = tokio::spawn(async move {
poll_fn(|cx| {
let res = rd.poll_read_buf(&mut buf, cx);
assert_eq!(1, rd.cnt);
assert_eq!(buf[..], b"hello world"[..]);
res
})
.await
})
.await;
assert!(matches!(res, Ok(Ok(11usize))));
}
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