async-task-tracker 0.1.0

A task tracker used for waiting until tasks exit.
Documentation 
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use async_task_tracker::TaskTracker;
use tokio_test::{assert_pending, assert_ready, task};

#[test]
fn open_close() {
    let tracker = TaskTracker::new();
    assert!(!tracker.is_closed());
    assert!(tracker.is_empty());
    assert_eq!(tracker.len(), 0);

    tracker.close();
    assert!(tracker.is_closed());
    assert!(tracker.is_empty());
    assert_eq!(tracker.len(), 0);

    tracker.reopen();
    assert!(!tracker.is_closed());
    tracker.reopen();
    assert!(!tracker.is_closed());

    assert!(tracker.is_empty());
    assert_eq!(tracker.len(), 0);

    tracker.close();
    assert!(tracker.is_closed());
    tracker.close();
    assert!(tracker.is_closed());

    assert!(tracker.is_empty());
    assert_eq!(tracker.len(), 0);
}

#[test]
fn token_len() {
    let tracker = TaskTracker::new();

    let mut tokens = Vec::new();
    for i in 0..10 {
        assert_eq!(tracker.len(), i);
        tokens.push(tracker.token());
    }

    assert!(!tracker.is_empty());
    assert_eq!(tracker.len(), 10);

    for (i, token) in tokens.into_iter().enumerate() {
        drop(token);
        assert_eq!(tracker.len(), 9 - i);
    }
}

#[test]
fn notify_immediately() {
    let tracker = TaskTracker::new();
    tracker.close();

    let mut wait = task::spawn(tracker.wait());
    assert_ready!(wait.poll());
}

#[test]
fn notify_immediately_on_reopen() {
    let tracker = TaskTracker::new();
    tracker.close();

    let mut wait = task::spawn(tracker.wait());
    tracker.reopen();
    assert_ready!(wait.poll());
}

#[test]
fn notify_on_close() {
    let tracker = TaskTracker::new();

    let mut wait = task::spawn(tracker.wait());

    assert_pending!(wait.poll());
    tracker.close();
    assert_ready!(wait.poll());
}

#[test]
fn notify_on_close_reopen() {
    let tracker = TaskTracker::new();

    let mut wait = task::spawn(tracker.wait());

    assert_pending!(wait.poll());
    tracker.close();
    tracker.reopen();
    assert_ready!(wait.poll());
}

#[test]
fn notify_on_last_task() {
    let tracker = TaskTracker::new();
    tracker.close();
    let token = tracker.token();

    let mut wait = task::spawn(tracker.wait());
    assert_pending!(wait.poll());
    drop(token);
    assert_ready!(wait.poll());
}

#[test]
fn notify_on_last_task_respawn() {
    let tracker = TaskTracker::new();
    tracker.close();
    let token = tracker.token();

    let mut wait = task::spawn(tracker.wait());
    assert_pending!(wait.poll());
    drop(token);
    let token2 = tracker.token();
    assert_ready!(wait.poll());
    drop(token2);
}

#[test]
fn no_notify_on_respawn_if_open() {
    let tracker = TaskTracker::new();
    let token = tracker.token();

    let mut wait = task::spawn(tracker.wait());
    assert_pending!(wait.poll());
    drop(token);
    let token2 = tracker.token();
    assert_pending!(wait.poll());
    drop(token2);
}

#[test]
fn close_during_exit() {
    const ITERS: usize = 5;

    for close_spot in 0..=ITERS {
        let tracker = TaskTracker::new();
        let tokens: Vec<_> = (0..ITERS).map(|_| tracker.token()).collect();

        let mut wait = task::spawn(tracker.wait());

        for (i, token) in tokens.into_iter().enumerate() {
            assert_pending!(wait.poll());
            if i == close_spot {
                tracker.close();
                assert_pending!(wait.poll());
            }
            drop(token);
        }

        if close_spot == ITERS {
            assert_pending!(wait.poll());
            tracker.close();
        }

        assert_ready!(wait.poll());
    }
}

#[test]
fn notify_many() {
    let tracker = TaskTracker::new();

    let mut waits: Vec<_> = (0..10).map(|_| task::spawn(tracker.wait())).collect();

    for wait in &mut waits {
        assert_pending!(wait.poll());
    }

    tracker.close();

    for wait in &mut waits {
        assert_ready!(wait.poll());
    }
}