use futures::channel::oneshot;
use futures::executor::{block_on, block_on_stream};
use futures::future::{self, join, FutureExt};
use futures::stream::{StreamExt, FuturesOrdered};
use futures_test::task::noop_context;
#[test]
fn works_1() {
let (a_tx, a_rx) = oneshot::channel::<i32>();
let (b_tx, b_rx) = oneshot::channel::<i32>();
let (c_tx, c_rx) = oneshot::channel::<i32>();
let mut stream = vec![a_rx, b_rx, c_rx].into_iter().collect::<FuturesOrdered<_>>();
b_tx.send(99).unwrap();
assert!(stream.poll_next_unpin(&mut noop_context()).is_pending());
a_tx.send(33).unwrap();
c_tx.send(33).unwrap();
let mut iter = block_on_stream(stream);
assert_eq!(Some(Ok(33)), iter.next());
assert_eq!(Some(Ok(99)), iter.next());
assert_eq!(Some(Ok(33)), iter.next());
assert_eq!(None, iter.next());
}
#[test]
fn works_2() {
let (a_tx, a_rx) = oneshot::channel::<i32>();
let (b_tx, b_rx) = oneshot::channel::<i32>();
let (c_tx, c_rx) = oneshot::channel::<i32>();
let mut stream = vec![
a_rx.boxed(),
join(b_rx, c_rx).map(|(a, b)| Ok(a? + b?)).boxed(),
].into_iter().collect::<FuturesOrdered<_>>();
let mut cx = noop_context();
a_tx.send(33).unwrap();
b_tx.send(33).unwrap();
assert!(stream.poll_next_unpin(&mut cx).is_ready());
assert!(stream.poll_next_unpin(&mut cx).is_pending());
c_tx.send(33).unwrap();
assert!(stream.poll_next_unpin(&mut cx).is_ready());
}
#[test]
fn from_iterator() {
let stream = vec![
future::ready::<i32>(1),
future::ready::<i32>(2),
future::ready::<i32>(3)
].into_iter().collect::<FuturesOrdered<_>>();
assert_eq!(stream.len(), 3);
assert_eq!(block_on(stream.collect::<Vec<_>>()), vec![1,2,3]);
}