tests: update python tests

Author: Hoblovski

testdata/pyfileimports/main.py

@@ -1,3 +1,19 @@
+# Copyright 2025 CloudWeGo Authors
+#
+# 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
+#
+#     https://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.
+
+
+# fmt: off
 import abc
 import base64
 

testdata/pythonoperator/main.py

@@ -0,0 +1,38 @@
+# Copyright 2025 CloudWeGo Authors
+#
+# 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
+#
+#     https://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.
+
+
+class A:
+    def __init__(self):
+        self.value = 10
+
+    def get_value(self):
+        return self.value
+
+    def __add__(self, other):
+        if isinstance(other, A):
+            return A(self.value + other.value)
+        return NotImplemented
+
+
+def main():
+    a1 = A()
+    a2 = A()
+
+    print("Value of a1:", a1.get_value())
+    print("Value of a2:", a2.get_value())
+
+    # There should be a dependency from main to A.__add__
+    a3 = a1 + a2
+    print("Value of a3 (a1 + a2):", a3.get_value())