From 7968f6f83d17175683e04ce56aa48e44ed7d0d98 Mon Sep 17 00:00:00 2001
From: Brad Dunbar <dunbarb2@gmail.com>
Date: Mon, 4 Mar 2024 03:04:40 -0500
Subject: Remove redundant reserve call (#674)

---
 tests/test_bytes.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'tests/test_bytes.rs')

diff --git a/tests/test_bytes.rs b/tests/test_bytes.rs
index 76adfdb..e3820d7 100644
--- a/tests/test_bytes.rs
+++ b/tests/test_bytes.rs
@@ -598,6 +598,28 @@ fn extend_mut_from_bytes() {
     assert_eq!(*bytes, LONG[..]);
 }
 
+#[test]
+fn extend_past_lower_limit_of_size_hint() {
+    // See https://github.com/tokio-rs/bytes/pull/674#pullrequestreview-1913035700
+    struct Iter<I>(I);
+
+    impl<I: Iterator<Item = u8>> Iterator for Iter<I> {
+        type Item = u8;
+
+        fn next(&mut self) -> Option<Self::Item> {
+            self.0.next()
+        }
+
+        fn size_hint(&self) -> (usize, Option<usize>) {
+            (5, None)
+        }
+    }
+
+    let mut bytes = BytesMut::with_capacity(5);
+    bytes.extend(Iter(std::iter::repeat(0).take(10)));
+    assert_eq!(bytes.len(), 10);
+}
+
 #[test]
 fn extend_mut_without_size_hint() {
     let mut bytes = BytesMut::with_capacity(0);
-- 
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