old_contents: #!/usr/bin/env python3
  
  # Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
  #
  # 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.
  
  import os
  import sys
  
  sys.path.append(os.path.join(os.environ['RIOTBASE'], 'dist/tools/testrunner'))
  import testrunner
  
  def testfunc(child):
      child.expect('first thread\r\n')
      child.expect('second thread\r\n')
  
  if __name__ == "__main__":
      sys.exit(testrunner.run(testfunc))
  
new_contents: #!/usr/bin/env python3
  
  # Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
  #
  # 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.
  
  import os
  import sys
  
  sys.path.append(os.path.join(os.environ['RIOTBASE'], 'dist/tools/testrunner'))
  import testrunner
  
  
  def testfunc(child):
      child.expect('first thread\r\n')
      child.expect('second thread\r\n')
  
  if __name__ == "__main__":
      sys.exit(testrunner.run(testfunc))
  
subject: fix pep8 in testrunner script