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#![deny(warnings, rust_2018_idioms)]
use tokio::io::{AsyncRead, AsyncWrite, AsyncReadExt};
use tokio_test::assert_ready_ok;
use tokio_test::task::MockTask;
use bytes::BytesMut;
use pin_utils::pin_mut;
use std::future::Future;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
#[test]
fn copy() {
struct Rd(bool);
impl AsyncRead for Rd {
fn poll_read(
mut self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
if self.0 {
buf[0..11].copy_from_slice(b"hello world");
self.0 = false;
Poll::Ready(Ok(11))
} else {
Poll::Ready(Ok(0))
}
}
}
struct Wr(BytesMut);
impl Unpin for Wr {}
impl AsyncWrite for Wr {
fn poll_write(
mut self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
self.0.extend(buf);
Ok(buf.len()).into()
}
fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
Ok(()).into()
}
fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
Ok(()).into()
}
}
let buf = BytesMut::with_capacity(64);
let mut task = MockTask::new();
task.enter(|cx| {
let mut rd = Rd(true);
let mut wr = Wr(buf);
let copy = rd.copy(&mut wr);
pin_mut!(copy);
let n = assert_ready_ok!(copy.poll(cx));
assert_eq!(n, 11);
assert_eq!(wr.0[..], b"hello world"[..]);
});
}
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