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use futures::executor::block_on;
use futures::future::{Future, FutureExt};
use futures::io::{AsyncReadExt, Cursor};
use futures::stream::{self, StreamExt, TryStreamExt};
use futures::task::Poll;
use futures_test::io::AsyncReadTestExt;
use futures_test::task::noop_context;
#[test]
fn read_to_string() {
let mut c = Cursor::new(&b""[..]);
let mut v = String::new();
assert_eq!(block_on(c.read_to_string(&mut v)).unwrap(), 0);
assert_eq!(v, "");
let mut c = Cursor::new(&b"1"[..]);
let mut v = String::new();
assert_eq!(block_on(c.read_to_string(&mut v)).unwrap(), 1);
assert_eq!(v, "1");
let mut c = Cursor::new(&b"\xff"[..]);
let mut v = String::new();
assert!(block_on(c.read_to_string(&mut v)).is_err());
}
#[test]
fn interleave_pending() {
fn run<F: Future + Unpin>(mut f: F) -> F::Output {
let mut cx = noop_context();
loop {
if let Poll::Ready(x) = f.poll_unpin(&mut cx) {
return x;
}
}
}
let mut buf = stream::iter(vec![&b"12"[..], &b"33"[..], &b"3"[..]])
.map(Ok)
.into_async_read()
.interleave_pending();
let mut v = String::new();
assert_eq!(run(buf.read_to_string(&mut v)).unwrap(), 5);
assert_eq!(v, "12333");
}
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