class_docstr: For the "compare" command.
class_docstr_tok: ["For","the","``","compare","''","command","."]
code: def test_compare(self):
      parser = cmd_line_parser.CmdLineParser()
      results, _ = parser.parse_line(
          "compare _test_lhs_fn _test_rhs_fn --inputs _INPUT_VAR_ONE"
      )
      self.assertEqual(
          ("_test_lhs_fn", _test_lhs_fn), results.lhs_name_and_fn
      )
      self.assertEqual(
          ("_test_rhs_fn", _test_rhs_fn), results.rhs_name_and_fn
      )
      self.assertEmpty(results.compare_fn)
  
imports: from __future__ import annotations
  import sys
  from unittest import mock
  from absl.testing import absltest
  from google.generativeai.notebook import argument_parser
  from google.generativeai.notebook import cmd_line_parser
  from google.generativeai.notebook import model_registry
  from google.generativeai.notebook import parsed_args_lib
  from google.generativeai.notebook import post_process_utils
  from google.generativeai.notebook.lib import llm_function
  from google.generativeai.notebook.lib import llmfn_output_row
  from google.generativeai.notebook.lib import llmfn_outputs
  from google.generativeai.notebook.lib import model
label_desc: Use image node_id 1 for calling the CmdLineParserCompareTest obj's underlying member method code with example usage: obj.test_compare() without return types