1 files changed, 16 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/io_chain.rs b/third_party/rust/tokio/tests/io_chain.rs
new file mode 100644
index 0000000000..e2d59411a1
--- /dev/null
+++ b/third_party/rust/tokio/tests/io_chain.rs
@@ -0,0 +1,16 @@
+#![warn(rust_2018_idioms)]
+#![cfg(feature = "full")]
+
+use tokio::io::AsyncReadExt;
+use tokio_test::assert_ok;
+
+#[tokio::test]
+async fn chain() {
+    let mut buf = Vec::new();
+    let rd1: &[u8] = b"hello ";
+    let rd2: &[u8] = b"world";
+
+    let mut rd = rd1.chain(rd2);
+    assert_ok!(rd.read_to_end(&mut buf).await);
+    assert_eq!(buf, b"hello world");
+}