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84 lines
1.9 KiB
84 lines
1.9 KiB
use tokio_stream::{self as stream, Stream, StreamExt};
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use tokio_test::task;
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use tokio_test::{assert_pending, assert_ready};
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mod support {
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pub(crate) mod mpsc;
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}
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use support::mpsc;
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#[tokio::test]
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async fn merge_sync_streams() {
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let mut s = stream::iter(vec![0, 2, 4, 6]).merge(stream::iter(vec![1, 3, 5]));
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for i in 0..7 {
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let rem = 7 - i;
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assert_eq!(s.size_hint(), (rem, Some(rem)));
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assert_eq!(Some(i), s.next().await);
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}
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assert!(s.next().await.is_none());
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}
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#[tokio::test]
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async fn merge_async_streams() {
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let (tx1, rx1) = mpsc::unbounded_channel_stream();
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let (tx2, rx2) = mpsc::unbounded_channel_stream();
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let mut rx = task::spawn(rx1.merge(rx2));
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assert_eq!(rx.size_hint(), (0, None));
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assert_pending!(rx.poll_next());
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tx1.send(1).unwrap();
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assert!(rx.is_woken());
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assert_eq!(Some(1), assert_ready!(rx.poll_next()));
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assert_pending!(rx.poll_next());
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tx2.send(2).unwrap();
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assert!(rx.is_woken());
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assert_eq!(Some(2), assert_ready!(rx.poll_next()));
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assert_pending!(rx.poll_next());
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drop(tx1);
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assert!(rx.is_woken());
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assert_pending!(rx.poll_next());
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tx2.send(3).unwrap();
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assert!(rx.is_woken());
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assert_eq!(Some(3), assert_ready!(rx.poll_next()));
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assert_pending!(rx.poll_next());
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drop(tx2);
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assert!(rx.is_woken());
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assert_eq!(None, assert_ready!(rx.poll_next()));
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}
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#[test]
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fn size_overflow() {
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struct Monster;
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impl tokio_stream::Stream for Monster {
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type Item = ();
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fn poll_next(
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self: std::pin::Pin<&mut Self>,
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_cx: &mut std::task::Context<'_>,
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) -> std::task::Poll<Option<()>> {
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panic!()
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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(usize::max_value(), Some(usize::max_value()))
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}
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}
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let m1 = Monster;
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let m2 = Monster;
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let m = m1.merge(m2);
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assert_eq!(m.size_hint(), (usize::max_value(), None));
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}
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