future_abortable.rs

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use futures::channel::oneshot;

use futures::executor::block_on;

use futures::future::{abortable, Aborted, FutureExt};

use futures::task::{Context, Poll};

use futures_test::task::new_count_waker;

#[test]

fn abortable_works() {

    let (_tx, a_rx) = oneshot::channel::<()>();

    let (abortable_rx, abort_handle) = abortable(a_rx);

    abort_handle.abort();

    assert!(abortable_rx.is_aborted());

    assert_eq!(Err(Aborted), block_on(abortable_rx));

#[test]

fn abortable_awakens() {

    let (_tx, a_rx) = oneshot::channel::<()>();

    let (mut abortable_rx, abort_handle) = abortable(a_rx);

    let (waker, counter) = new_count_waker();

    let mut cx = Context::from_waker(&waker);

    assert_eq!(counter, 0);

    assert_eq!(Poll::Pending, abortable_rx.poll_unpin(&mut cx));

    assert_eq!(counter, 0);

    abort_handle.abort();

    assert_eq!(counter, 1);

    assert!(abortable_rx.is_aborted());

    assert_eq!(Poll::Ready(Err(Aborted)), abortable_rx.poll_unpin(&mut cx));

#[test]

fn abortable_resolves() {

    let (tx, a_rx) = oneshot::channel::<()>();

    let (abortable_rx, _abort_handle) = abortable(a_rx);

    tx.send(()).unwrap();

    assert!(!abortable_rx.is_aborted());

    assert_eq!(Ok(Ok(())), block_on(abortable_rx));