class_docstr: For the "run" command.
class_docstr_tok: ["For","the","``","run","''","command","."]
code: def test_parse_tokens(self):
      parser = cmd_line_parser.CmdLineParser()
      _, post_process_exprs = parser.parse_line(
          "| add_length | to_upper"
      )
      self.assertLen(post_process_exprs, 2)
      self.assertEqual(["add_length"], post_process_exprs[0])
      self.assertEqual(["to_upper"], post_process_exprs[1])
  
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 CmdLineParserPostProcessingTest obj's underlying member method code with example usage: obj.test_parse_tokens() without return types