async-timer 0.7.4

Timers for Rust async story
Documentation 
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use async_timer::{Timed};
use async_timer::oneshot::{Oneshot, Timer};

use std::time;

#[tokio::test]
async fn test_timed() {
    let future = Timer::new(time::Duration::from_secs(4));
    let work = Timed::platform_new(future, time::Duration::from_secs(3));

    let before = time::SystemTime::now();

    let expired = work.await.unwrap_err();
    let work = expired.await;

    assert!(work.await.is_ok());
    let after = time::SystemTime::now();
    let diff = after.duration_since(before).unwrap();

    assert!(diff.as_millis() >= 3_500 && diff.as_millis() <= 4_500);
}