code: def test_modification(self):
      with open(self.script, "r") as f:
          script = f.read()
      script = ac.add_shenbang(script)
      self.assertEqual(script[:2], "#!")
  
      script = ac.add_func(script, "function", ["x"])
      script = ac.add_main(script)
      self.assertTrue("__main__" in script)
      self.assertTrue(ac.add_main(script))
  
file_path: auptimizer/tests/command/test_convert.py
imports: import os
  import unittest
  from aup import convert
label_desc: Use image node_id 3 for calling the AutoConvertTestCase obj's underlying member method code with example usage: obj.test_modification() without return types