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#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf};
use tokio_test::assert_ok;
#[tokio::test]
async fn read_to_end() {
let mut buf = vec![];
let mut rd: &[u8] = b"hello world";
let n = assert_ok!(rd.read_to_end(&mut buf).await);
assert_eq!(n, 11);
assert_eq!(buf[..], b"hello world"[..]);
}
#[derive(Copy, Clone, Debug)]
enum State {
Initializing,
JustFilling,
Done,
}
struct UninitTest {
num_init: usize,
state: State,
}
impl AsyncRead for UninitTest {
fn poll_read(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<std::io::Result<()>> {
let me = Pin::into_inner(self);
let real_num_init = buf.initialized().len() - buf.filled().len();
assert_eq!(real_num_init, me.num_init, "{:?}", me.state);
match me.state {
State::Initializing => {
buf.initialize_unfilled_to(me.num_init + 2);
buf.advance(1);
me.num_init += 1;
if me.num_init == 24 {
me.state = State::JustFilling;
}
}
State::JustFilling => {
buf.advance(1);
me.num_init -= 1;
if me.num_init == 15 {
// The buffer is resized on next call.
me.num_init = 0;
me.state = State::Done;
}
}
State::Done => { /* .. do nothing .. */ }
}
Poll::Ready(Ok(()))
}
}
#[tokio::test]
async fn read_to_end_uninit() {
let mut buf = Vec::with_capacity(64);
let mut test = UninitTest {
num_init: 0,
state: State::Initializing,
};
test.read_to_end(&mut buf).await.unwrap();
assert_eq!(buf.len(), 33);
}
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