async-timer 0.7.4

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

use std::time;

#[tokio::test]
async fn test_oneshot() {
    let work = Timer::new(time::Duration::from_secs(2));
    assert!(!work.is_expired());

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

    assert!(diff.as_millis() >= 1_500 && diff.as_millis() <= 2_500);
}

#[tokio::test]
async fn test_tons_oneshot() {
    const NUM: usize = 1024;
    let mut jobs = Vec::with_capacity(NUM);

    for _ in 0..NUM {
        jobs.push(Timer::new(time::Duration::from_secs(2)));
    }

    let before = time::SystemTime::now();
    futures_util::future::join_all(jobs).await;
    let after = time::SystemTime::now();
    let diff = after.duration_since(before).unwrap();

    assert!(diff.as_millis() >= 1_500 && diff.as_millis() <= 2_500);
}

#[tokio::test]
async fn test_smol_oneshot() {
    let work = Timer::new(time::Duration::from_millis(500));
    assert!(!work.is_expired());

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

    assert!(diff.as_millis() >= 250 && diff.as_millis() <= 750);
}

#[tokio::test]
async fn test_nano_oneshot() {
    let work = Timer::new(time::Duration::from_nanos(604000));
    assert!(!work.is_expired());
    work.await;
}