blob: 0ec2bef35b0997ae0c2eaa13ffe2ca824bbe2f19 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
#![deny(warnings, rust_2018_idioms)]
#![feature(async_await)]
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"[..]);
}
|