/
mod.rs
41 lines (37 loc) · 1.37 KB
/
mod.rs
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//! Additional combinators for testing streams.
use futures_core::stream::Stream;
pub use crate::interleave_pending::InterleavePending;
/// Additional combinators for testing streams.
pub trait StreamTestExt: Stream {
/// Introduces an extra [`Poll::Pending`](futures_core::task::Poll::Pending)
/// in between each item of the stream.
///
/// # Examples
///
/// ```
/// 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));
/// ```
fn interleave_pending(self) -> InterleavePending<Self>
where
Self: Sized,
{
InterleavePending::new(self)
}
}
impl<St> StreamTestExt for St where St: Stream {}