code: def add_subparser(self, name, parser):
      # pylint: disable=protected-access
      description = (
          """Test that installation works by running the unit tests."""
      )
      subparser = parser.add_parser(
          name, description=description, help="Run the unit tests."
      )
  
      subparser.add_argument(
          "--run-all",
          action="store_true",
          help="By default, we skip tests that are slow "
          "or download large files. This flag will run all tests.",
      )
  
      subparser.set_defaults(func=_run_test)
  
      return subparser
  
file_path: magnitude/pymagnitude/third_party/allennlp/commands/test_install.py
imports: from __future__ import absolute_import
  import argparse
  import logging
  import os
  import pathlib
  import pytest
  import allennlp
  from allennlp.commands.subcommand import Subcommand
label_desc: Use image node_id 1 for calling the TestInstall obj's underlying member method code with example usage: obj.add_subparser(name, parser) and returns: subparser