#![cfg(feature = "full")]
use tokio::io::{self, AsyncSeekExt};
// use tokio::{
//     io::{AsyncBufReadExt, AsyncReadExt},
//     select,
// };

// #[nio::test]
// async fn empty_read_is_cooperative() {
//     select! {
//         biased;
//         _ = async {
//             loop {
//                 let mut buf = [0u8; 4096];
//                 let _ = io::empty().read(&mut buf).await;
//             }
//         } => {},
//         _ = nio::task::yield_now() => {}
//     }
// }

// #[nio::test]
// async fn empty_buf_reads_are_cooperative() {
//     select! {
//         biased;
//         _ = async {
//             loop {
//                 let mut buf = String::new();
//                 let _ = io::empty().read_line(&mut buf).await;
//             }
//         } => {},
//         _ = nio::task::yield_now() => {}
//     }
// }

#[nio::test]
async fn empty_seek() {
    use std::io::SeekFrom;

    let mut empty = 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)
    ));
}