From 8dbc3c79379f2243fc04d444239d009c1c610016 Mon Sep 17 00:00:00 2001
From: Carl Lerche <me@carllerche.com>
Date: Wed, 21 Oct 2020 14:08:49 -0700
Subject: io: add `AsyncReadExt::read_buf` (#3003)

Brings back `read_buf` from 0.2. This will be stabilized as part of 1.0.
---
 tokio/tests/io_read_buf.rs | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 tokio/tests/io_read_buf.rs

(limited to 'tokio/tests/io_read_buf.rs')

diff --git a/tokio/tests/io_read_buf.rs b/tokio/tests/io_read_buf.rs
new file mode 100644
index 00000000..0328168d
--- /dev/null
+++ b/tokio/tests/io_read_buf.rs
@@ -0,0 +1,36 @@
+#![warn(rust_2018_idioms)]
+#![cfg(feature = "full")]
+
+use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf};
+use tokio_test::assert_ok;
+
+use std::io;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+#[tokio::test]
+async fn read_buf() {
+    struct Rd {
+        cnt: usize,
+    }
+
+    impl AsyncRead for Rd {
+        fn poll_read(
+            mut self: Pin<&mut Self>,
+            _cx: &mut Context<'_>,
+            buf: &mut ReadBuf<'_>,
+        ) -> Poll<io::Result<()>> {
+            self.cnt += 1;
+            buf.put_slice(b"hello world");
+            Poll::Ready(Ok(()))
+        }
+    }
+
+    let mut buf = vec![];
+    let mut rd = Rd { cnt: 0 };
+
+    let n = assert_ok!(rd.read_buf(&mut buf).await);
+    assert_eq!(1, rd.cnt);
+    assert_eq!(n, 11);
+    assert_eq!(buf[..], b"hello world"[..]);
+}
-- 
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