use tokio_stream::{self as stream, Stream, StreamExt}; #[tokio::test] async fn basic_usage() { let mut one = stream::once(1); assert_eq!(one.size_hint(), (1, Some(1))); assert_eq!(Some(1), one.next().await); assert_eq!(one.size_hint(), (0, Some(0))); assert_eq!(None, one.next().await); }