1#![warn(rust_2018_idioms)]
2#![cfg(feature = "full")]
3
4use tokio::io::{AsyncWrite, AsyncWriteExt};
5
6use std::io;
7use std::pin::Pin;
8use std::task::{Context, Poll};
9
10#[tokio::test]
11async fn write_int_should_err_if_write_count_0() {
12 struct Wr {}
13
14 impl AsyncWrite for Wr {
15 fn poll_write(
16 self: Pin<&mut Self>,
17 _cx: &mut Context<'_>,
18 _buf: &[u8],
19 ) -> Poll<io::Result<usize>> {
20 Ok(0).into()
21 }
22
23 fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
24 Ok(()).into()
25 }
26
27 fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
28 Ok(()).into()
29 }
30 }
31
32 let mut wr = Wr {};
33
34 // should be ok just to test these 2, other cases actually expanded by same macro.
35 assert!(wr.write_i8(0).await.is_err());
36 assert!(wr.write_i32(12).await.is_err());
37}
38