diff --git a/packages/custom_ops/approval_trigger.cu b/packages/custom_ops/approval_trigger.cu
new file mode 100644
index 00000000000..7bbbcaa7b00
--- /dev/null
+++ b/packages/custom_ops/approval_trigger.cu
@@ -0,0 +1,16 @@
+// Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
+//
+// 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.
+
+// This placeholder file intentionally lives under packages/custom_ops so
+// changed-file path rules can detect custom operator related changes.
diff --git a/tests/common_test.py b/tests/common_test.py
index 0b6424dd27c..8dcf9f65a79 100644
--- a/tests/common_test.py
+++ b/tests/common_test.py
@@ -30,6 +30,12 @@ def get_container_type(container):
     return container_t
 
 
+class TestGetContainerType(unittest.TestCase):
+    def test_empty_container_type(self):
+        self.assertIs(get_container_type([]), list)
+        self.assertIs(get_container_type(()), tuple)
+
+
 class CommonTest(unittest.TestCase):
     def __init__(self, methodName="runTest"):
         super(CommonTest, self).__init__(methodName=methodName)