37 lines
829 B
Rust
37 lines
829 B
Rust
#![warn(rust_2018_idioms)]
|
|
#![cfg(feature = "full")]
|
|
|
|
use tokio::io::{self, AsyncRead, ReadBuf};
|
|
use tokio_test::assert_ok;
|
|
|
|
use std::pin::Pin;
|
|
use std::task::{Context, Poll};
|
|
|
|
#[tokio::test]
|
|
async fn copy() {
|
|
struct Rd(bool);
|
|
|
|
impl AsyncRead for Rd {
|
|
fn poll_read(
|
|
mut self: Pin<&mut Self>,
|
|
_cx: &mut Context<'_>,
|
|
buf: &mut ReadBuf<'_>,
|
|
) -> Poll<io::Result<()>> {
|
|
if self.0 {
|
|
buf.put_slice(b"hello world");
|
|
self.0 = false;
|
|
Poll::Ready(Ok(()))
|
|
} else {
|
|
Poll::Ready(Ok(()))
|
|
}
|
|
}
|
|
}
|
|
|
|
let mut rd = Rd(true);
|
|
let mut wr = Vec::new();
|
|
|
|
let n = assert_ok!(io::copy(&mut rd, &mut wr).await);
|
|
assert_eq!(n, 11);
|
|
assert_eq!(wr, b"hello world");
|
|
}
|