doido-cable 0.0.4

Action Cable analogue: channels, broadcasts, Turbo-friendly pub/sub backends for Doido.
Documentation 
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use doido_cable::{MemoryPubSub, PubSub};
use std::sync::Arc;

#[tokio::test]
async fn test_publish_and_receive() {
    let ps = Arc::new(MemoryPubSub::new());
    let mut rx = ps.subscribe("stream1").await.unwrap();
    ps.publish("stream1", "hello").await.unwrap();
    let msg = rx.recv().await.unwrap();
    assert_eq!(msg, "hello");
}

#[tokio::test]
async fn test_multiple_subscribers_receive_same_message() {
    let ps = Arc::new(MemoryPubSub::new());
    let mut rx1 = ps.subscribe("stream1").await.unwrap();
    let mut rx2 = ps.subscribe("stream1").await.unwrap();
    ps.publish("stream1", "broadcast").await.unwrap();
    assert_eq!(rx1.recv().await.unwrap(), "broadcast");
    assert_eq!(rx2.recv().await.unwrap(), "broadcast");
}

#[tokio::test]
async fn test_different_streams_are_isolated() {
    let ps = Arc::new(MemoryPubSub::new());
    let mut rx1 = ps.subscribe("stream1").await.unwrap();
    ps.publish("stream2", "other").await.unwrap();
    ps.publish("stream1", "mine").await.unwrap();
    let msg = rx1.recv().await.unwrap();
    assert_eq!(msg, "mine");
}