diff options
Diffstat (limited to 'vendor/tokio/tests/io_write_all_buf.rs')
-rw-r--r-- | vendor/tokio/tests/io_write_all_buf.rs | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/vendor/tokio/tests/io_write_all_buf.rs b/vendor/tokio/tests/io_write_all_buf.rs new file mode 100644 index 000000000..b49a58ebe --- /dev/null +++ b/vendor/tokio/tests/io_write_all_buf.rs @@ -0,0 +1,96 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use tokio::io::{AsyncWrite, AsyncWriteExt}; +use tokio_test::{assert_err, assert_ok}; + +use bytes::{Buf, Bytes, BytesMut}; +use std::cmp; +use std::io; +use std::pin::Pin; +use std::task::{Context, Poll}; + +#[tokio::test] +async fn write_all_buf() { + struct Wr { + buf: BytesMut, + cnt: usize, + } + + impl AsyncWrite for Wr { + fn poll_write( + mut self: Pin<&mut Self>, + _cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll<io::Result<usize>> { + let n = cmp::min(4, buf.len()); + dbg!(buf); + let buf = &buf[0..n]; + + self.cnt += 1; + self.buf.extend(buf); + Ok(buf.len()).into() + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> { + Ok(()).into() + } + + fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> { + Ok(()).into() + } + } + + let mut wr = Wr { + buf: BytesMut::with_capacity(64), + cnt: 0, + }; + + let mut buf = Bytes::from_static(b"hello").chain(Bytes::from_static(b"world")); + + assert_ok!(wr.write_all_buf(&mut buf).await); + assert_eq!(wr.buf, b"helloworld"[..]); + // expect 4 writes, [hell],[o],[worl],[d] + assert_eq!(wr.cnt, 4); + assert_eq!(buf.has_remaining(), false); +} + +#[tokio::test] +async fn write_buf_err() { + /// Error out after writing the first 4 bytes + struct Wr { + cnt: usize, + } + + impl AsyncWrite for Wr { + fn poll_write( + mut self: Pin<&mut Self>, + _cx: &mut Context<'_>, + _buf: &[u8], + ) -> Poll<io::Result<usize>> { + self.cnt += 1; + if self.cnt == 2 { + return Poll::Ready(Err(io::Error::new(io::ErrorKind::Other, "whoops"))); + } + Poll::Ready(Ok(4)) + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> { + Ok(()).into() + } + + fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> { + Ok(()).into() + } + } + + let mut wr = Wr { cnt: 0 }; + + let mut buf = Bytes::from_static(b"hello").chain(Bytes::from_static(b"world")); + + assert_err!(wr.write_all_buf(&mut buf).await); + assert_eq!( + buf.copy_to_bytes(buf.remaining()), + Bytes::from_static(b"oworld") + ); +} |