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use tokio::sync::oneshot;
use tokio_test::{assert_pending, assert_ready, task};
#[tokio::test]
async fn sync_one_lit_expr_comma() {
let foo = tokio::try_join!(async { ok(1) },);
assert_eq!(foo, Ok((1,)));
}
#[tokio::test]
async fn sync_one_lit_expr_no_comma() {
let foo = tokio::try_join!(async { ok(1) });
assert_eq!(foo, Ok((1,)));
}
#[tokio::test]
async fn sync_two_lit_expr_comma() {
let foo = tokio::try_join!(async { ok(1) }, async { ok(2) },);
assert_eq!(foo, Ok((1, 2)));
}
#[tokio::test]
async fn sync_two_lit_expr_no_comma() {
let foo = tokio::try_join!(async { ok(1) }, async { ok(2) });
assert_eq!(foo, Ok((1, 2)));
}
#[tokio::test]
async fn two_await() {
let (tx1, rx1) = oneshot::channel::<&str>();
let (tx2, rx2) = oneshot::channel::<u32>();
let mut join =
task::spawn(async { tokio::try_join!(async { rx1.await }, async { rx2.await }) });
assert_pending!(join.poll());
tx2.send(123).unwrap();
assert!(join.is_woken());
assert_pending!(join.poll());
tx1.send("hello").unwrap();
assert!(join.is_woken());
let res: Result<(&str, u32), _> = assert_ready!(join.poll());
assert_eq!(Ok(("hello", 123)), res);
}
#[tokio::test]
async fn err_abort_early() {
let (tx1, rx1) = oneshot::channel::<&str>();
let (tx2, rx2) = oneshot::channel::<u32>();
let (_tx3, rx3) = oneshot::channel::<u32>();
let mut join = task::spawn(async {
tokio::try_join!(async { rx1.await }, async { rx2.await }, async {
rx3.await
})
});
assert_pending!(join.poll());
tx2.send(123).unwrap();
assert!(join.is_woken());
assert_pending!(join.poll());
drop(tx1);
assert!(join.is_woken());
let res = assert_ready!(join.poll());
assert!(res.is_err());
}
#[test]
fn join_size() {
use futures::future;
use std::mem;
let fut = async {
let ready = future::ready(ok(0i32));
tokio::try_join!(ready)
};
assert_eq!(mem::size_of_val(&fut), 16);
let fut = async {
let ready1 = future::ready(ok(0i32));
let ready2 = future::ready(ok(0i32));
tokio::try_join!(ready1, ready2)
};
assert_eq!(mem::size_of_val(&fut), 28);
}
fn ok<T>(val: T) -> Result<T, ()> {
Ok(val)
}
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