1 files changed, 23 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/io_read_until.rs b/third_party/rust/tokio/tests/io_read_until.rs
new file mode 100644
index 0000000000..4e0e0d10d3
--- /dev/null
+++ b/third_party/rust/tokio/tests/io_read_until.rs
@@ -0,0 +1,23 @@
+#![warn(rust_2018_idioms)]
+#![cfg(feature = "full")]
+
+use tokio::io::AsyncBufReadExt;
+use tokio_test::assert_ok;
+
+#[tokio::test]
+async fn read_until() {
+    let mut buf = vec![];
+    let mut rd: &[u8] = b"hello world";
+
+    let n = assert_ok!(rd.read_until(b' ', &mut buf).await);
+    assert_eq!(n, 6);
+    assert_eq!(buf, b"hello ");
+    buf.clear();
+    let n = assert_ok!(rd.read_until(b' ', &mut buf).await);
+    assert_eq!(n, 5);
+    assert_eq!(buf, b"world");
+    buf.clear();
+    let n = assert_ok!(rd.read_until(b' ', &mut buf).await);
+    assert_eq!(n, 0);
+    assert_eq!(buf, []);
+}