old_contents: import unittest
  import denshijiti
  
  class TestCode(unittest.TestCase):
  	def test_code(self):
  		denshijiti.run_code()
  
new_contents: import os.environ
  import unittest
  import denshijiti
  import shutil
  import os.path
  
  class TestCode(unittest.TestCase):
  	def test_code(self):
  		denshijiti.run_code()
  		shutil.copy("code.ttl", os.path.join(os.path.dirname(__file__), "../docs/"))
  
subject: add copy operation