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use futures::executor::block_on;
use futures::pin_mut;
use futures_util::future::{err, ok, try_join_all, TryJoinAll};
use std::fmt::Debug;
use std::future::Future;
#[track_caller]
fn assert_done<T>(actual_fut: impl Future<Output = T>, expected: T)
where
T: PartialEq + Debug,
{
pin_mut!(actual_fut);
let output = block_on(actual_fut);
assert_eq!(output, expected);
}
#[test]
fn collect_collects() {
assert_done(try_join_all(vec![ok(1), ok(2)]), Ok::<_, usize>(vec![1, 2]));
assert_done(try_join_all(vec![ok(1), err(2)]), Err(2));
assert_done(try_join_all(vec![ok(1)]), Ok::<_, usize>(vec![1]));
// REVIEW: should this be implemented?
// assert_done(try_join_all(Vec::<i32>::new()), Ok(vec![]));
// TODO: needs more tests
}
#[test]
fn try_join_all_iter_lifetime() {
// In futures-rs version 0.1, this function would fail to typecheck due to an overly
// conservative type parameterization of `TryJoinAll`.
fn sizes(bufs: Vec<&[u8]>) -> impl Future<Output = Result<Vec<usize>, ()>> {
let iter = bufs.into_iter().map(|b| ok::<usize, ()>(b.len()));
try_join_all(iter)
}
assert_done(sizes(vec![&[1, 2, 3], &[], &[0]]), Ok(vec![3_usize, 0, 1]));
}
#[test]
fn try_join_all_from_iter() {
assert_done(
vec![ok(1), ok(2)].into_iter().collect::<TryJoinAll<_>>(),
Ok::<_, usize>(vec![1, 2]),
)
}