diff --git a/tests/serialization/test_dag_serialization.py b/tests/serialization/test_dag_serialization.py
index ae2cbea8894d1..b245a1128751e 100644
--- a/tests/serialization/test_dag_serialization.py
+++ b/tests/serialization/test_dag_serialization.py
@@ -543,6 +543,67 @@ def test_dag_serialized_fields_with_schema(self):
         dag_params: set = set(dag_schema.keys()) - ignored_keys
         self.assertEqual(set(DAG.get_serialized_fields()), dag_params)
 
+    def test_no_new_fields_added_to_base_operator(self):
+        """
+        This test verifies that there are no new fields added to BaseOperator. And reminds that
+        tests should be added for it.
+        """
+        base_operator = BaseOperator(task_id="10")
+        fields = base_operator.__dict__
+        self.assertEqual({'_dag': None,
+                          '_downstream_task_ids': set(),
+                          '_inlets': [],
+                          '_log': base_operator.log,
+                          '_outlets': [],
+                          '_upstream_task_ids': set(),
+                          'depends_on_past': False,
+                          'do_xcom_push': True,
+                          'email': None,
+                          'email_on_failure': True,
+                          'email_on_retry': True,
+                          'end_date': None,
+                          'execution_timeout': None,
+                          'executor_config': {},
+                          'inlets': [],
+                          'max_retry_delay': None,
+                          'on_execute_callback': None,
+                          'on_failure_callback': None,
+                          'on_retry_callback': None,
+                          'on_success_callback': None,
+                          'outlets': [],
+                          'owner': 'airflow',
+                          'params': {},
+                          'pool': 'default_pool',
+                          'priority_weight': 1,
+                          'queue': 'default',
+                          'resources': None,
+                          'retries': 0,
+                          'retry_delay': timedelta(0, 300),
+                          'retry_exponential_backoff': False,
+                          'run_as_user': None,
+                          'sla': None,
+                          'start_date': None,
+                          'subdag': None,
+                          'task_concurrency': None,
+                          'task_id': '10',
+                          'trigger_rule': 'all_success',
+                          'wait_for_downstream': False,
+                          'weight_rule': 'downstream'}, fields,
+                         """
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+     ACTION NEEDED! PLEASE READ THIS CAREFULLY AND CORRECT TESTS CAREFULLY
+
+ Some fields were added to the BaseOperator! Please add them to the list above and make sure that
+ you add support for DAG serialization - you should add the field to
+ `airflow/serialization/schema.json` - they should have correct type defined there.
+
+ Note that we do not support versioning yet so you should only add optional fields to BaseOperator.
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+                         """
+                         )
+
 
 if __name__ == '__main__':
     unittest.main()