Copilot + Noah review

Author: aclark4life

test/asynchronous/test_async_periodic_executor.py

@@ -0,0 +1,48 @@
+# Copyright 2026-present MongoDB, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Async-only unit tests for AsyncPeriodicExecutor."""
+
+from __future__ import annotations
+
+import sys
+
+sys.path[0:0] = [""]
+
+from test.asynchronous import AsyncUnitTest, unittest
+
+from pymongo.periodic_executor import AsyncPeriodicExecutor
+
+
+class TestAsyncPeriodicExecutorExceptions(AsyncUnitTest):
+    async def test_target_exception_stops_executor(self):
+        call_count = 0
+
+        async def target():
+            nonlocal call_count
+            call_count += 1
+            raise RuntimeError("error")
+
+        executor = AsyncPeriodicExecutor(
+            interval=30.0, min_interval=0.01, target=target, name="test"
+        )
+        executor.open()
+        await executor.join(timeout=2)
+        if executor._task is not None and executor._task.done():
+            executor._task.exception()
+        self.assertEqual(call_count, 1, "target should stop after exception")
+
+
+if __name__ == "__main__":
+    unittest.main()