future_select_all.rs

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use futures::executor::block_on;

use futures::future::{ready, select_all};

use std::collections::HashSet;

#[test]

fn smoke() {

    let v = vec![ready(1), ready(2), ready(3)];

    let mut c = vec![1, 2, 3].into_iter().collect::<HashSet<_>>();

    let (i, idx, v) = block_on(select_all(v));

    assert!(c.remove(&i));

    assert_eq!(idx, 0);

    let (i, idx, v) = block_on(select_all(v));

    assert!(c.remove(&i));

    assert_eq!(idx, 0);

    let (i, idx, v) = block_on(select_all(v));

    assert!(c.remove(&i));

    assert_eq!(idx, 0);

    assert!(c.is_empty());

    assert!(v.is_empty());