new_contents: #!/usr/bin/env python3
  
  # Copyright (C) 2019 Freie Universität Berlin
  #
  # This file is subject to the terms and conditions of the GNU Lesser
  # General Public License v2.1. See the file LICENSE in the top level
  # directory for more details.
  
  """periph_hwrng test
  
  Automatic checking of the periph_hwrng firmware.
  It checks the output is valid but not the number themselves.
  """
  
  import sys
  from testrunner import run
  
  
  def testfunc(child):
      """Test generating several numbers
  
      It prints hardware generated random bytes buffer from increasing size.
      The generated random numbers are not checked.
      """
      child.expect_exact('HWRNG peripheral driver test')
      child.expect(r'This test will print from 1 to (\d+)'
                   ' random bytes about every second')
      iterations = int(child.match.group(1))
  
      for num in range(1, iterations + 1):
          child.expect_exact('generating %u random byte(s)' % num)
          generated = 'Got:' + num * (r' 0x[0-9a-fA-F]{2}')
          child.expect(generated)
  
  
  if __name__ == "__main__":
      sys.exit(run(testfunc))
  
subject: add automated python test