code: def add_subparser(
      self, parser: argparse._SubParsersAction
  ) -> argparse.ArgumentParser:
      description = """Test that AllenNLP is installed correctly."""
      subparser = parser.add_parser(
          self.name,
          description=description,
          help="Test AllenNLP installation.",
      )
      subparser.set_defaults(func=_run_test)
      return subparser
  
file_path: allennlp/allennlp/commands/test_install.py
imports: import argparse
  import logging
  import pathlib
  import torch
  import allennlp
  from allennlp.common.util import import_module_and_submodules
  from allennlp.commands.subcommand import Subcommand
  from allennlp.version import VERSION
label_desc: Use image node_id 1 for calling the TestInstall obj's underlying member method code with example usage: obj.add_subparser(parser) and returns: subparser