watch.rs - mozsearch

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#![cfg(feature = "sync")]

use tokio::sync::watch;

use tokio_stream::wrappers::WatchStream;

use tokio_stream::StreamExt;

use tokio_test::assert_pending;

use tokio_test::task::spawn;

#[tokio::test]

async fn watch_stream_message_not_twice() {

    let (tx, rx) = watch::channel("hello");

    let mut counter = 0;

    let mut stream = WatchStream::new(rx).map(move |payload| {

        println!("{}", payload);

        if payload == "goodbye" {

            counter += 1;

        if counter >= 2 {

            panic!("too many goodbyes");

});

    let task = tokio::spawn(async move { while stream.next().await.is_some() {} });

    // Send goodbye just once

    tx.send("goodbye").unwrap();

    drop(tx);

    task.await.unwrap();

#[tokio::test]

async fn watch_stream_from_rx() {

    let (tx, rx) = watch::channel("hello");

    let mut stream = WatchStream::from(rx);

    assert_eq!(stream.next().await.unwrap(), "hello");

    tx.send("bye").unwrap();

    assert_eq!(stream.next().await.unwrap(), "bye");

#[tokio::test]

async fn watch_stream_from_changes() {

    let (tx, rx) = watch::channel("hello");

    let mut stream = WatchStream::from_changes(rx);

    assert_pending!(spawn(&mut stream).poll_next());

    tx.send("bye").unwrap();

    assert_eq!(stream.next().await.unwrap(), "bye");