[−][src]Trait futures_test::stream::StreamTestExt

pub trait StreamTestExt: Stream {
    fn interleave_pending(self) -> InterleavePending<Self>
    where
        Self: Sized,
    { ... }
}

Additional combinators for testing streams.

Provided methods

ⓘImportant traits for InterleavePending<Fut>
fn interleave_pending(self) -> InterleavePending<Self> where
    Self: Sized, 

Introduces an extra Poll::Pending in between each item of the stream.

Examples

#![feature(async_await)]
use futures::task::Poll;
use futures::stream::{self, Stream};
use futures_test::task::noop_context;
use futures_test::stream::StreamTestExt;
use futures::pin_mut;

let stream = stream::iter(vec![1, 2]).interleave_pending();
pin_mut!(stream);

let mut cx = noop_context();

assert_eq!(stream.as_mut().poll_next(&mut cx), Poll::Pending);
assert_eq!(stream.as_mut().poll_next(&mut cx), Poll::Ready(Some(1)));
assert_eq!(stream.as_mut().poll_next(&mut cx), Poll::Pending);
assert_eq!(stream.as_mut().poll_next(&mut cx), Poll::Ready(Some(2)));
assert_eq!(stream.as_mut().poll_next(&mut cx), Poll::Pending);
assert_eq!(stream.as_mut().poll_next(&mut cx), Poll::Ready(None));
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Implementors

impl<St> StreamTestExt for St where
    St: Stream, [src]

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