code: def test_get_item(self):
      row = LLMFnOutputRow(
          data={"one": "first", "two": "second", "three": "third"},
          result_type=str,
      )
      self.assertEqual("first", row["one"])
      self.assertEqual("second", row["two"])
      self.assertEqual("third", row["three"])
  
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 10 for calling the LLMFnOutputRowTest obj's underlying member method code with example usage: obj.test_get_item() without return types