1 files changed, 37 insertions, 0 deletions
diff --git a/tests/extmod/uasyncio_cancel_fair2.py b/tests/extmod/uasyncio_cancel_fair2.py
new file mode 100644
index 0000000000..46e40f71b1
--- /dev/null
+++ b/tests/extmod/uasyncio_cancel_fair2.py
@@ -0,0 +1,37 @@
+# Test fairness of cancelling a task
+# That tasks which keeps being cancelled by multiple other tasks gets a chance to run
+
+try:
+    import uasyncio as asyncio
+except ImportError:
+    try:
+        import asyncio
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+
+async def task_a():
+    try:
+        while True:
+            print("sleep a")
+            await asyncio.sleep(0)
+    except asyncio.CancelledError:
+        print("cancelled a")
+
+
+async def task_b(id, other):
+    while other.cancel():
+        print("sleep b", id)
+        await asyncio.sleep(0)
+    print("done b", id)
+
+
+async def main():
+    t = asyncio.create_task(task_a())
+    for i in range(3):
+        asyncio.create_task(task_b(i, t))
+    await t
+
+
+asyncio.run(main())