Merge "Test: Make doh_unit_test boot_time::timeout_drift less flaky"

#[tokio::test]

async fn timeout_drift() {

    let delta = Duration::from_millis(20);

    for _ in 0..10 {

    let delta = Duration::from_millis(40);

    for _ in 0..5 {

        let start = BootTime::now();

        assert!(timeout(delta, pending::<()>()).await.is_err());

        let taken = start.elapsed();

        let drift = if taken > delta { taken - delta } else { delta - taken };

        assert!(drift < Duration::from_millis(5));

        assert!(drift < Duration::from_millis(10));

    }

    for _ in 0..10 {

    for _ in 0..5 {

        let start = BootTime::now();

        sleep(delta).await;

        let taken = start.elapsed();

        let drift = if taken > delta { taken - delta } else { delta - taken };

        assert!(drift < Duration::from_millis(5));

        assert!(drift < Duration::from_millis(10));

    }

}