From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 library/std/src/sync/mpsc/spsc_queue/tests.rs | 101 ++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 library/std/src/sync/mpsc/spsc_queue/tests.rs

(limited to 'library/std/src/sync/mpsc/spsc_queue/tests.rs')

diff --git a/library/std/src/sync/mpsc/spsc_queue/tests.rs b/library/std/src/sync/mpsc/spsc_queue/tests.rs
new file mode 100644
index 000000000..467ef3dbd
--- /dev/null
+++ b/library/std/src/sync/mpsc/spsc_queue/tests.rs
@@ -0,0 +1,101 @@
+use super::Queue;
+use crate::sync::mpsc::channel;
+use crate::sync::Arc;
+use crate::thread;
+
+#[test]
+fn smoke() {
+    unsafe {
+        let queue = Queue::with_additions(0, (), ());
+        queue.push(1);
+        queue.push(2);
+        assert_eq!(queue.pop(), Some(1));
+        assert_eq!(queue.pop(), Some(2));
+        assert_eq!(queue.pop(), None);
+        queue.push(3);
+        queue.push(4);
+        assert_eq!(queue.pop(), Some(3));
+        assert_eq!(queue.pop(), Some(4));
+        assert_eq!(queue.pop(), None);
+    }
+}
+
+#[test]
+fn peek() {
+    unsafe {
+        let queue = Queue::with_additions(0, (), ());
+        queue.push(vec![1]);
+
+        // Ensure the borrowchecker works
+        match queue.peek() {
+            Some(vec) => {
+                assert_eq!(&*vec, &[1]);
+            }
+            None => unreachable!(),
+        }
+
+        match queue.pop() {
+            Some(vec) => {
+                assert_eq!(&*vec, &[1]);
+            }
+            None => unreachable!(),
+        }
+    }
+}
+
+#[test]
+fn drop_full() {
+    unsafe {
+        let q: Queue<Box<_>> = Queue::with_additions(0, (), ());
+        q.push(Box::new(1));
+        q.push(Box::new(2));
+    }
+}
+
+#[test]
+fn smoke_bound() {
+    unsafe {
+        let q = Queue::with_additions(0, (), ());
+        q.push(1);
+        q.push(2);
+        assert_eq!(q.pop(), Some(1));
+        assert_eq!(q.pop(), Some(2));
+        assert_eq!(q.pop(), None);
+        q.push(3);
+        q.push(4);
+        assert_eq!(q.pop(), Some(3));
+        assert_eq!(q.pop(), Some(4));
+        assert_eq!(q.pop(), None);
+    }
+}
+
+#[test]
+fn stress() {
+    unsafe {
+        stress_bound(0);
+        stress_bound(1);
+    }
+
+    unsafe fn stress_bound(bound: usize) {
+        let q = Arc::new(Queue::with_additions(bound, (), ()));
+
+        let (tx, rx) = channel();
+        let q2 = q.clone();
+        let _t = thread::spawn(move || {
+            for _ in 0..100000 {
+                loop {
+                    match q2.pop() {
+                        Some(1) => break,
+                        Some(_) => panic!(),
+                        None => {}
+                    }
+                }
+            }
+            tx.send(()).unwrap();
+        });
+        for _ in 0..100000 {
+            q.push(1);
+        }
+        rx.recv().unwrap();
+    }
+}
-- 
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