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#![deny(warnings, rust_2018_idioms)]
use tokio::io::{AsyncRead, AsyncReadExt};
use tokio_test::assert_ready_ok;
use tokio_test::task::MockTask;
use pin_utils::pin_mut;
use std::future::Future;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
#[test]
fn read_exact() {
struct Rd {
val: &'static [u8; 11],
}
impl AsyncRead for Rd {
fn poll_read(
mut self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut [u8]
) -> Poll<io::Result<usize>> {
let me = &mut *self;
let len = buf.len();
buf[..].copy_from_slice(&me.val[..len]);
Poll::Ready(Ok(buf.len()))
}
}
let mut buf = Box::new([0; 8]);
let mut task = MockTask::new();
task.enter(|cx| {
let mut rd = Rd { val: b"hello world" };
let read = rd.read_exact(&mut buf[..]);
pin_mut!(read);
let n = assert_ready_ok!(read.poll(cx));
assert_eq!(n, 8);
assert_eq!(buf[..], b"hello wo"[..]);
});
}
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