old_contents: # Constants used throughout the test suite
  
  # Main Docker image
  # This image is used for nearly all tests where a "real" docker image is
  # necessary (becuase we're going to actually invoke some docker command).
  #
  # Requirements:
  # - Must contain /bin/bash (TestMain::test_*shell_override*)
  #
  DOCKER_IMAGE = 'debian:8.2'
  
  # Alternate Docker image
  # This image is used for alternate tests (e.g. pulling) and should be small.
  ALT_DOCKER_IMAGE = 'busybox:latest'
  
  
  # Act as an executable for consumption by non-Python things
  if __name__ == '__main__':
      for name, val in dict(vars()).items():
          if name.startswith('_'):
              continue
          print('{}="{}"'.format(name, val))
  
new_contents: # Constants used throughout the test suite
  
  # Main Docker image
  # This image is used for nearly all tests where a "real" docker image is
  # necessary (becuase we're going to actually invoke some docker command).
  #
  # Requirements:
  # - Must contain /bin/bash (TestMain::test_*shell_override*)
  #
  DOCKER_IMAGE = 'debian:10'
  
  # Alternate Docker image
  # This image is used for alternate tests (e.g. pulling) and should be small.
  ALT_DOCKER_IMAGE = 'busybox:latest'
  
  
  # Act as an executable for consumption by non-Python things
  if __name__ == '__main__':
      for name, val in dict(vars()).items():
          if name.startswith('_'):
              continue
          print('{}="{}"'.format(name, val))
  
subject: Update DOCKER_IMAGE to debian:10