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use core::pin::Pin;
use futures::io::{AsyncBufRead, AsyncRead};
use futures::stream::{self, TryStreamExt};
use futures::task::Poll;
use futures_test::{stream::StreamTestExt, task::noop_context};
macro_rules! assert_read {
($reader:expr, $buf:expr, $item:expr) => {
let mut cx = noop_context();
loop {
match Pin::new(&mut $reader).poll_read(&mut cx, $buf) {
Poll::Ready(Ok(x)) => {
assert_eq!(x, $item);
break;
}
Poll::Ready(Err(err)) => {
panic!("assertion failed: expected value but got {}", err);
}
Poll::Pending => {
continue;
}
}
}
};
}
macro_rules! assert_fill_buf {
($reader:expr, $buf:expr) => {
let mut cx = noop_context();
loop {
match Pin::new(&mut $reader).poll_fill_buf(&mut cx) {
Poll::Ready(Ok(x)) => {
assert_eq!(x, $buf);
break;
}
Poll::Ready(Err(err)) => {
panic!("assertion failed: expected value but got {}", err);
}
Poll::Pending => {
continue;
}
}
}
};
}
#[test]
fn test_into_async_read() {
let stream = stream::iter((1..=3).flat_map(|_| vec![Ok(vec![]), Ok(vec![1, 2, 3, 4, 5])]));
let mut reader = stream.interleave_pending().into_async_read();
let mut buf = vec![0; 3];
assert_read!(reader, &mut buf, 3);
assert_eq!(&buf, &[1, 2, 3]);
assert_read!(reader, &mut buf, 2);
assert_eq!(&buf[..2], &[4, 5]);
assert_read!(reader, &mut buf, 3);
assert_eq!(&buf, &[1, 2, 3]);
assert_read!(reader, &mut buf, 2);
assert_eq!(&buf[..2], &[4, 5]);
assert_read!(reader, &mut buf, 3);
assert_eq!(&buf, &[1, 2, 3]);
assert_read!(reader, &mut buf, 2);
assert_eq!(&buf[..2], &[4, 5]);
assert_read!(reader, &mut buf, 0);
}
#[test]
fn test_into_async_bufread() {
let stream = stream::iter((1..=2).flat_map(|_| vec![Ok(vec![]), Ok(vec![1, 2, 3, 4, 5])]));
let mut reader = stream.interleave_pending().into_async_read();
let mut reader = Pin::new(&mut reader);
assert_fill_buf!(reader, &[1, 2, 3, 4, 5][..]);
reader.as_mut().consume(3);
assert_fill_buf!(reader, &[4, 5][..]);
reader.as_mut().consume(2);
assert_fill_buf!(reader, &[1, 2, 3, 4, 5][..]);
reader.as_mut().consume(2);
assert_fill_buf!(reader, &[3, 4, 5][..]);
reader.as_mut().consume(3);
assert_fill_buf!(reader, &[][..]);
}