old_contents: #!/Users/takashi/.pyenv/shims/python
  
  
  def readiris(fn):
  
      return res
  
  
  def test_readiris():
      assert 0
  
new_contents: #!/Users/takashi/.pyenv/shims/python
  
  
  def readiris(fn):
  
      return res
  
  
  def test_readiris():
      """
          test readiris(fn)
          task to the code: first entry is correct
      """
  
      assert 0
  
subject: add the comments to test_readiris