old_contents: """
  Unit tests at Windows environments required to invoke from py module,
  because of multiprocessing:
  https://py.rtfd.io/en/latest/faq.html?highlight=cmdline#issues-with-py-test-multiprocess-and-setuptools
  """
  
  import sys
  
  import py
  
  
  if __name__ == "__main__":
      sys.exit(py.test.cmdline.main(["-vv"]))
  
new_contents: #!/usr/bin/env python3
  
  """
  Unit tests at Windows environments required to invoke from py module,
  because of multiprocessing:
  https://py.rtfd.io/en/latest/faq.html?highlight=cmdline#issues-with-py-test-multiprocess-and-setuptools
  """
  
  import sys
  
  import py
  
  
  if __name__ == "__main__":
      sys.exit(py.test.cmdline.main(["-vv"]))
  
subject: Add shebang