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mod util {
use std::future::Future;
use futures::executor::block_on;
use std::fmt::Debug;
pub 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() {
use futures_util::future::{err, ok, try_join_all};
use util::assert_done;
assert_done(|| Box::new(try_join_all(vec![ok(1), ok(2)])), Ok::<_, usize>(vec![1, 2]));
assert_done(|| Box::new(try_join_all(vec![ok(1), err(2)])), Err(2));
assert_done(|| Box::new(try_join_all(vec![ok(1)])), Ok::<_, usize>(vec![1]));
// REVIEW: should this be implemented?
// assert_done(|| Box::new(try_join_all(Vec::<i32>::new())), Ok(vec![]));
// TODO: needs more tests
}
#[test]
fn try_join_all_iter_lifetime() {
use futures_util::future::{ok, try_join_all};
use std::future::Future;
use util::assert_done;
// 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]>) -> Box<dyn Future<Output = Result<Vec<usize>, ()>> + Unpin> {
let iter = bufs.into_iter().map(|b| ok::<usize, ()>(b.len()));
Box::new(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() {
use futures_util::future::{ok, TryJoinAll};
use util::assert_done;
assert_done(
|| Box::new(vec![ok(1), ok(2)].into_iter().collect::<TryJoinAll<_>>()),
Ok::<_, usize>(vec![1, 2]),
)
}
|
