code: def test_is_mapping(self):
      row = LLMFnOutputRow(data={"result": "none"}, result_type=str)
      self.assertLen(row, self._test_is_mapping_impl(row))
  
file_path: generative-ai-python/tests/notebook/lib/test_llmfn_output_row.py
imports: from __future__ import annotations
  from typing import Any, Mapping
  from absl.testing import absltest
  from google.generativeai.notebook.lib import llmfn_output_row
label_desc: Use image node_id 2 for calling the LLMFnOutputRowTest obj's underlying member method code with example usage: obj.test_is_mapping() without return types