1 files changed, 146 insertions, 0 deletions
diff --git a/third_party/rust/tokio-stream/tests/stream_collect.rs b/third_party/rust/tokio-stream/tests/stream_collect.rs
new file mode 100644
index 0000000000..07659a1fc3
--- /dev/null
+++ b/third_party/rust/tokio-stream/tests/stream_collect.rs
@@ -0,0 +1,146 @@
+use tokio_stream::{self as stream, StreamExt};
+use tokio_test::{assert_pending, assert_ready, assert_ready_err, assert_ready_ok, task};
+
+mod support {
+    pub(crate) mod mpsc;
+}
+
+use support::mpsc;
+
+#[allow(clippy::let_unit_value)]
+#[tokio::test]
+async fn empty_unit() {
+    // Drains the stream.
+    let mut iter = vec![(), (), ()].into_iter();
+    let _: () = stream::iter(&mut iter).collect().await;
+    assert!(iter.next().is_none());
+}
+
+#[tokio::test]
+async fn empty_vec() {
+    let coll: Vec<u32> = stream::empty().collect().await;
+    assert!(coll.is_empty());
+}
+
+#[tokio::test]
+async fn empty_box_slice() {
+    let coll: Box<[u32]> = stream::empty().collect().await;
+    assert!(coll.is_empty());
+}
+
+#[tokio::test]
+async fn empty_string() {
+    let coll: String = stream::empty::<&str>().collect().await;
+    assert!(coll.is_empty());
+}
+
+#[tokio::test]
+async fn empty_result() {
+    let coll: Result<Vec<u32>, &str> = stream::empty().collect().await;
+    assert_eq!(Ok(vec![]), coll);
+}
+
+#[tokio::test]
+async fn collect_vec_items() {
+    let (tx, rx) = mpsc::unbounded_channel_stream();
+    let mut fut = task::spawn(rx.collect::<Vec<i32>>());
+
+    assert_pending!(fut.poll());
+
+    tx.send(1).unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    tx.send(2).unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    drop(tx);
+    assert!(fut.is_woken());
+    let coll = assert_ready!(fut.poll());
+    assert_eq!(vec![1, 2], coll);
+}
+
+#[tokio::test]
+async fn collect_string_items() {
+    let (tx, rx) = mpsc::unbounded_channel_stream();
+
+    let mut fut = task::spawn(rx.collect::<String>());
+
+    assert_pending!(fut.poll());
+
+    tx.send("hello ".to_string()).unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    tx.send("world".to_string()).unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    drop(tx);
+    assert!(fut.is_woken());
+    let coll = assert_ready!(fut.poll());
+    assert_eq!("hello world", coll);
+}
+
+#[tokio::test]
+async fn collect_str_items() {
+    let (tx, rx) = mpsc::unbounded_channel_stream();
+
+    let mut fut = task::spawn(rx.collect::<String>());
+
+    assert_pending!(fut.poll());
+
+    tx.send("hello ").unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    tx.send("world").unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    drop(tx);
+    assert!(fut.is_woken());
+    let coll = assert_ready!(fut.poll());
+    assert_eq!("hello world", coll);
+}
+
+#[tokio::test]
+async fn collect_results_ok() {
+    let (tx, rx) = mpsc::unbounded_channel_stream();
+
+    let mut fut = task::spawn(rx.collect::<Result<String, &str>>());
+
+    assert_pending!(fut.poll());
+
+    tx.send(Ok("hello ")).unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    tx.send(Ok("world")).unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    drop(tx);
+    assert!(fut.is_woken());
+    let coll = assert_ready_ok!(fut.poll());
+    assert_eq!("hello world", coll);
+}
+
+#[tokio::test]
+async fn collect_results_err() {
+    let (tx, rx) = mpsc::unbounded_channel_stream();
+
+    let mut fut = task::spawn(rx.collect::<Result<String, &str>>());
+
+    assert_pending!(fut.poll());
+
+    tx.send(Ok("hello ")).unwrap();
+    assert!(fut.is_woken());
+    assert_pending!(fut.poll());
+
+    tx.send(Err("oh no")).unwrap();
+    assert!(fut.is_woken());
+    let err = assert_ready_err!(fut.poll());
+    assert_eq!("oh no", err);
+}