docstr: Test expected templated fields.
code: def test_assert_templated_fields(self):
      """Test expected templated fields."""
      operator = EmailOperator(
          task_id="test_assert_templated_fields",
          **self.default_op_kwargs,
      )
      template_fields = (
          "to",
          "from_email",
          "subject",
          "html_content",
          "files",
          "cc",
          "bcc",
      )
      assert operator.template_fields == template_fields
  
file_path: airflow/tests/providers/smtp/operators/test_smtp.py
imports: from __future__ import annotations
  import json
  from unittest.mock import patch
  from airflow.models import Connection
  from airflow.providers.smtp.operators.smtp import EmailOperator
label_desc: Use image node_id 3 for calling the TestEmailOperator obj's underlying member method code with example usage: obj.test_assert_templated_fields() without return types