third_party/rust/futures/tests/stream_try_stream.rs


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use futures::{
    stream::{self, StreamExt, TryStreamExt},
    task::Poll,
};
use futures_test::task::noop_context;

#[test]
fn try_filter_map_after_err() {
    let cx = &mut noop_context();
    let mut s = stream::iter(1..=3)
        .map(Ok)
        .try_filter_map(|v| async move { Err::<Option<()>, _>(v) })
        .filter_map(|r| async move { r.ok() })
        .boxed();
    assert_eq!(Poll::Ready(None), s.poll_next_unpin(cx));
}

#[test]
fn try_skip_while_after_err() {
    let cx = &mut noop_context();
    let mut s = stream::iter(1..=3)
        .map(Ok)
        .try_skip_while(|_| async move { Err::<_, ()>(()) })
        .filter_map(|r| async move { r.ok() })
        .boxed();
    assert_eq!(Poll::Ready(None), s.poll_next_unpin(cx));
}

#[test]
fn try_take_while_after_err() {
    let cx = &mut noop_context();
    let mut s = stream::iter(1..=3)
        .map(Ok)
        .try_take_while(|_| async move { Err::<_, ()>(()) })
        .filter_map(|r| async move { r.ok() })
        .boxed();
    assert_eq!(Poll::Ready(None), s.poll_next_unpin(cx));
}