1 files changed, 71 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/macros_join.rs b/third_party/rust/tokio/tests/macros_join.rs
new file mode 100644
index 0000000000..d9b748d9a7
--- /dev/null
+++ b/third_party/rust/tokio/tests/macros_join.rs
@@ -0,0 +1,71 @@
+use tokio::sync::oneshot;
+use tokio_test::{assert_pending, assert_ready, task};
+
+#[tokio::test]
+async fn sync_one_lit_expr_comma() {
+    let foo = tokio::join!(async { 1 },);
+
+    assert_eq!(foo, (1,));
+}
+
+#[tokio::test]
+async fn sync_one_lit_expr_no_comma() {
+    let foo = tokio::join!(async { 1 });
+
+    assert_eq!(foo, (1,));
+}
+
+#[tokio::test]
+async fn sync_two_lit_expr_comma() {
+    let foo = tokio::join!(async { 1 }, async { 2 },);
+
+    assert_eq!(foo, (1, 2));
+}
+
+#[tokio::test]
+async fn sync_two_lit_expr_no_comma() {
+    let foo = tokio::join!(async { 1 }, async { 2 });
+
+    assert_eq!(foo, (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::join!(async { rx1.await.unwrap() }, async { rx2.await.unwrap() })
+    });
+
+    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 = assert_ready!(join.poll());
+
+    assert_eq!(("hello", 123), res);
+}
+
+#[test]
+fn join_size() {
+    use futures::future;
+    use std::mem;
+
+    let fut = async {
+        let ready = future::ready(0i32);
+        tokio::join!(ready)
+    };
+    assert_eq!(mem::size_of_val(&fut), 16);
+
+    let fut = async {
+        let ready1 = future::ready(0i32);
+        let ready2 = future::ready(0i32);
+        tokio::join!(ready1, ready2)
+    };
+    assert_eq!(mem::size_of_val(&fut), 28);
+}