79 lines
1.9 KiB
Rust
79 lines
1.9 KiB
Rust
#![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);
|
|
}
|