summaryrefslogtreecommitdiffstats
path: root/third_party/rust/tokio/tests/io_write.rs
diff options
context:
space:
mode:
Diffstat (limited to 'third_party/rust/tokio/tests/io_write.rs')
-rw-r--r--third_party/rust/tokio/tests/io_write.rs58
1 files changed, 58 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/io_write.rs b/third_party/rust/tokio/tests/io_write.rs
new file mode 100644
index 0000000000..96cebc3313
--- /dev/null
+++ b/third_party/rust/tokio/tests/io_write.rs
@@ -0,0 +1,58 @@
+#![warn(rust_2018_idioms)]
+#![cfg(feature = "full")]
+
+use tokio::io::{AsyncWrite, AsyncWriteExt};
+use tokio_test::assert_ok;
+
+use bytes::BytesMut;
+use std::io;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+#[tokio::test]
+async fn write() {
+ 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>> {
+ assert_eq!(self.cnt, 0);
+ self.buf.extend(&buf[0..4]);
+ Ok(4).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 n = assert_ok!(wr.write(b"hello world").await);
+ assert_eq!(n, 4);
+ assert_eq!(wr.buf, b"hell"[..]);
+}
+
+#[tokio::test]
+async fn write_cursor() {
+ use std::io::Cursor;
+
+ let mut wr = Cursor::new(Vec::new());
+
+ let n = assert_ok!(wr.write(b"hello world").await);
+ assert_eq!(n, 11);
+ assert_eq!(wr.get_ref().as_slice(), &b"hello world"[..]);
+}