1 files changed, 100 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/macros_try_join.rs b/third_party/rust/tokio/tests/macros_try_join.rs
new file mode 100644
index 0000000000..faa55421a2
--- /dev/null
+++ b/third_party/rust/tokio/tests/macros_try_join.rs
@@ -0,0 +1,100 @@
+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)
+}