1 files changed, 35 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/io_lines.rs b/third_party/rust/tokio/tests/io_lines.rs
new file mode 100644
index 0000000000..2f6b3393b9
--- /dev/null
+++ b/third_party/rust/tokio/tests/io_lines.rs
@@ -0,0 +1,35 @@
+#![warn(rust_2018_idioms)]
+#![cfg(feature = "full")]
+
+use tokio::io::AsyncBufReadExt;
+use tokio_test::assert_ok;
+
+#[tokio::test]
+async fn lines_inherent() {
+    let rd: &[u8] = b"hello\r\nworld\n\n";
+    let mut st = rd.lines();
+
+    let b = assert_ok!(st.next_line().await).unwrap();
+    assert_eq!(b, "hello");
+    let b = assert_ok!(st.next_line().await).unwrap();
+    assert_eq!(b, "world");
+    let b = assert_ok!(st.next_line().await).unwrap();
+    assert_eq!(b, "");
+    assert!(assert_ok!(st.next_line().await).is_none());
+}
+
+#[tokio::test]
+async fn lines_stream() {
+    use tokio::stream::StreamExt;
+
+    let rd: &[u8] = b"hello\r\nworld\n\n";
+    let mut st = rd.lines();
+
+    let b = assert_ok!(st.next().await.unwrap());
+    assert_eq!(b, "hello");
+    let b = assert_ok!(st.next().await.unwrap());
+    assert_eq!(b, "world");
+    let b = assert_ok!(st.next().await.unwrap());
+    assert_eq!(b, "");
+    assert!(st.next().await.is_none());
+}