code: def test_set_result_value(self):
      row = LLMFnOutputRow(data={"result": "none"}, result_type=str)
      row.set_result_value("hello")
      self.assertEqual("result", row.result_key())
      self.assertEqual("hello", row.result_value())
  
      # Results should remain unaffected when a new column is added.
      row.add("column_one", 42)
      self.assertEqual("result", row.result_key())
      self.assertEqual("hello", row.result_value())
  
      self.assertEqual(
          {"column_one": 42, "result": "hello"},
          dict(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 9 for calling the LLMFnOutputRowTest obj's underlying member method code with example usage: obj.test_set_result_value() without return types