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-rw-r--r--third_party/rust/tokio/tests/io_read_line.rs29
1 files changed, 29 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/io_read_line.rs b/third_party/rust/tokio/tests/io_read_line.rs
new file mode 100644
index 0000000000..57ae37cef3
--- /dev/null
+++ b/third_party/rust/tokio/tests/io_read_line.rs
@@ -0,0 +1,29 @@
+#![warn(rust_2018_idioms)]
+#![cfg(feature = "full")]
+
+use tokio::io::AsyncBufReadExt;
+use tokio_test::assert_ok;
+
+use std::io::Cursor;
+
+#[tokio::test]
+async fn read_line() {
+ let mut buf = String::new();
+ let mut rd = Cursor::new(b"hello\nworld\n\n");
+
+ let n = assert_ok!(rd.read_line(&mut buf).await);
+ assert_eq!(n, 6);
+ assert_eq!(buf, "hello\n");
+ buf.clear();
+ let n = assert_ok!(rd.read_line(&mut buf).await);
+ assert_eq!(n, 6);
+ assert_eq!(buf, "world\n");
+ buf.clear();
+ let n = assert_ok!(rd.read_line(&mut buf).await);
+ assert_eq!(n, 1);
+ assert_eq!(buf, "\n");
+ buf.clear();
+ let n = assert_ok!(rd.read_line(&mut buf).await);
+ assert_eq!(n, 0);
+ assert_eq!(buf, "");
+}