potiuk commented on code in PR #35546:
URL: https://github.com/apache/airflow/pull/35546#discussion_r1387788704


##########
tests/serialization/test_dag_serialization.py:
##########
@@ -2035,20 +2035,18 @@ def test_params_serialize_default(self):
         assert param.description == "hello"
         assert param.schema == {"type": "string"}
 
-    def test_not_templateable_fields_in_serialized_dag(
-        self,
-    ):
+    def test_not_templateable_fields_in_serialized_dag(self):
         """
-        Test that when we use  not templateable fields, an Airflow exception 
is raised.
+        Test that when we use not templateable fields, an Airflow exception is 
raised.
         """
 
         class TestOperator(BaseOperator):
-            template_fields = ("execution_timeout",)
+            template_fields = ("email", "execution_timeout")
 
         dag = DAG("test_not_templateable_fields", start_date=datetime(2019, 8, 
1))
         with dag:
             TestOperator(task_id="test", 
execution_timeout=timedelta(seconds=10))
-        with pytest.raises(AirflowException, match="Cannot template 
BaseOperator fields: execution_timeout"):
+        with pytest.raises(AirflowException, match="Cannot template 
BaseOperator field: 'execution_timeout'"):
             SerializedDAG.to_dict(dag)

Review Comment:
   A nice addition here would be to add a test where you actually add the email 
with a jinja template and  run render_template_fields on task instance and see 
it rendered. 



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