text: """
  The `checklist` subcommand allows you to conduct behavioural
  testing for your model's predictions using a trained model and its
  [`Predictor`](../predictors/predictor.md#predictor) wrapper.
  
  It is based on the optional checklist package; if this is not
  available, the command will be replaced by a dummy.
  """
  
  import argparse
  import logging
  
  from allennlp.commands.subcommand import Subcommand
  
  logger = logging.getLogger(__name__)
  
  try:
      from allennlp.commands._checklist_internal import CheckList
  except ImportError:
      # create dummy command that tells users how to
      # install the necessary dependency
  
      def _dummy_output(args: argparse.Namespace):
          logger.info(
              "The checklist integration of allennlp is optional; if you're using conda, "
              "it can be installed with `conda install allennlp-checklist`, "
              "otherwise use `pip install allennlp[checklist]`."
          )
  
      # need to work around https://github.com/python/mypy/issues/1153
      @Subcommand.register("checklist")
      class CheckList(Subcommand):  # type: ignore
          def add_subparser(self, parser: argparse._SubParsersAction) -> argparse.ArgumentParser:
              description = """Dummy command because checklist is not installed."""
              subparser = parser.add_parser(
                  self.name,
                  description=description,
                  help="Run a trained model through a checklist suite.",
              )
              subparser.set_defaults(func=_dummy_output)
              return subparser
  