old_contents: #! /usr/bin/env python3
  """Test mel from a user's perspective."""
  
  import argparse
  import os
  import subprocess
  import sys
  
  
  class ExpectationError(Exception):
  
      def __init__(self, message, completed_process):
          super(ExpectationError, self).__init__(message)
          self.completed_process = completed_process
  
  
  def main():
      parser = argparse.ArgumentParser(description=__doc__)
      parser.parse_args()
  
      # cd to the root of the repository, so all the paths are relative to that
      rootdir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
      os.chdir(rootdir)
  
      try:
          run_tests()
      except ExpectationError as e:
          print()
          print(e)
          print("-- stdout:")
          print(e.completed_process.stdout)
          print("-- stderr:")
          print(e.completed_process.stderr)
          print("--")
          return 1
  
      print("OK")
  
  
  def run_tests():
  
      mel_cmd = './bin/mel'
  
      expect_returncode(2, mel_cmd)
      expect_ok(mel_cmd, '-h')
  
      subcommands = [
          'add-cluster',
          'add-single',
          'list',
          'micro-add',
          'micro-view',
          'rotomap-edit',
          'rotomap-molepicker',
          'rotomap-relate',
          'rotomap-show',
          'rotomap-uuid',
      ]
  
      for s in subcommands:
          expect_ok(mel_cmd, s, '-h')
  
  
  def expect_ok(*args):
      return expect_returncode(0, args)
  
  
  def expect_returncode(expected_code, command):
      print('.', end='', flush=True)
      # print('Running "{}", expect return code {}'.format(
      #     command, expected_code))
  
      result = subprocess.run(
          command,
          universal_newlines=True,
          stdout=subprocess.PIPE,
          stderr=subprocess.PIPE)
  
      if result.returncode != expected_code:
          raise ExpectationError("'{cmd}' returned {rc}, expected {erc}".format(
              cmd=command, rc=result.returncode, erc=expected_code),
              result)
  
  
  if __name__ == '__main__':
      sys.exit(main())
  
new_contents: #! /usr/bin/env python3
  """Test mel from a user's perspective."""
  
  import argparse
  import os
  import subprocess
  import sys
  
  
  class ExpectationError(Exception):
  
      def __init__(self, message, completed_process):
          super(ExpectationError, self).__init__(message)
          self.completed_process = completed_process
  
  
  def main():
      parser = argparse.ArgumentParser(description=__doc__)
      parser.parse_args()
  
      # cd to the root of the repository, so all the paths are relative to that
      rootdir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
      os.chdir(rootdir)
  
      try:
          run_tests()
      except ExpectationError as e:
          print()
          print(e)
          print("-- stdout:")
          print(e.completed_process.stdout)
          print("-- stderr:")
          print(e.completed_process.stderr)
          print("--")
          return 1
  
      print("OK")
  
  
  def run_tests():
  
      mel_cmd = './bin/mel'
  
      expect_returncode(2, mel_cmd)
      expect_ok(mel_cmd, '-h')
  
      subcommands = [
          'add-cluster',
          'add-single',
          'list',
          'micro-add',
          'micro-view',
          'rotomap-edit',
          'rotomap-molepicker',
          'rotomap-relate',
          'rotomap-show',
          'rotomap-uuid',
      ]
  
      for s in subcommands:
          expect_ok(mel_cmd, s, '-h')
  
  
  def expect_ok(*args):
      return expect_returncode(0, args)
  
  
  def expect_returncode(expected_code, command):
      print('.', end='', flush=True)
  
      result = subprocess.run(
          command,
          universal_newlines=True,
          stdout=subprocess.PIPE,
          stderr=subprocess.PIPE)
  
      if result.returncode != expected_code:
          raise ExpectationError("'{cmd}' returned {rc}, expected {erc}".format(
              cmd=command, rc=result.returncode, erc=expected_code),
              result)
  
  
  if __name__ == '__main__':
      sys.exit(main())
  
subject: remove dead code