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use futures_util::future::*;
use std::future::Future;
use futures::executor::block_on;
use std::fmt::Debug;
fn assert_done<T, F>(actual_fut: F, expected: T)
where
T: PartialEq + Debug,
F: FnOnce() -> Box<dyn Future<Output = T> + Unpin>,
{
let output = block_on(actual_fut());
assert_eq!(output, expected);
}
#[test]
fn collect_collects() {
assert_done(|| Box::new(join_all(vec![ready(1), ready(2)])), vec![1, 2]);
assert_done(|| Box::new(join_all(vec![ready(1)])), vec![1]);
// REVIEW: should this be implemented?
// assert_done(|| Box::new(join_all(Vec::<i32>::new())), vec![]);
// TODO: needs more tests
}
#[test]
fn join_all_iter_lifetime() {
// In futures-rs version 0.1, this function would fail to typecheck due to an overly
// conservative type parameterization of `JoinAll`.
fn sizes<'a>(bufs: Vec<&'a [u8]>) -> Box<dyn Future<Output = Vec<usize>> + Unpin> {
let iter = bufs.into_iter().map(|b| ready::<usize>(b.len()));
Box::new(join_all(iter))
}
assert_done(|| sizes(vec![&[1,2,3], &[], &[0]]), vec![3 as usize, 0, 1]);
}
#[test]
fn join_all_from_iter() {
assert_done(
|| Box::new(vec![ready(1), ready(2)].into_iter().collect::<JoinAll<_>>()),
vec![1, 2],
)
}
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