Merging upstream version 1.75.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/library/std/src/io/copy/tests.rs b/library/std/src/io/copy/tests.rs
index d9998e87c..af137eaf8 100644
--- a/library/std/src/io/copy/tests.rs
+++ b/library/std/src/io/copy/tests.rs
@@ -81,6 +81,18 @@ fn copy_specializes_bufreader() {
 }
 
 #[test]
+fn copy_specializes_to_vec() {
+    let cap = 123456;
+    let mut source = ShortReader { cap, observed_buffer: 0, read_size: 1337 };
+    let mut sink = Vec::new();
+    assert_eq!(cap as u64, io::copy(&mut source, &mut sink).unwrap());
+    assert!(
+        source.observed_buffer > DEFAULT_BUF_SIZE,
+        "expected a large buffer to be provided to the reader"
+    );
+}
+
+#[test]
 fn copy_specializes_from_vecdeque() {
     let mut source = VecDeque::with_capacity(100 * 1024);
     for _ in 0..20 * 1024 {