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#![cfg(feature = "full")]
use tokio::io::{AsyncBufReadExt, AsyncReadExt, AsyncSeekExt};
#[tokio::test]
async fn empty_read_is_cooperative() {
tokio::select! {
biased;
_ = async {
loop {
let mut buf = [0u8; 4096];
let _ = tokio::io::empty().read(&mut buf).await;
}
} => {},
_ = tokio::task::yield_now() => {}
}
}
#[tokio::test]
async fn empty_buf_reads_are_cooperative() {
tokio::select! {
biased;
_ = async {
loop {
let mut buf = String::new();
let _ = tokio::io::empty().read_line(&mut buf).await;
}
} => {},
_ = tokio::task::yield_now() => {}
}
}
#[tokio::test]
async fn empty_seek() {
use std::io::SeekFrom;
let mut empty = tokio::io::empty();
assert!(matches!(empty.seek(SeekFrom::Start(0)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::Start(1)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::Start(u64::MAX)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::End(i64::MIN)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::End(-1)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::End(0)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::End(1)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::End(i64::MAX)).await, Ok(0)));
assert!(matches!(
empty.seek(SeekFrom::Current(i64::MIN)).await,
Ok(0)
));
assert!(matches!(empty.seek(SeekFrom::Current(-1)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::Current(0)).await, Ok(0)));
assert!(matches!(empty.seek(SeekFrom::Current(1)).await, Ok(0)));
assert!(matches!(
empty.seek(SeekFrom::Current(i64::MAX)).await,
Ok(0)
));
}