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use tokio::stream::{self, StreamExt};
use tokio::sync::mpsc;
use tokio_test::{assert_pending, assert_ready, assert_ready_err, assert_ready_ok, task};
#[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();
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();
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();
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();
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();
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);
}
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