code: def test_copydoc(self):
      def original_docstring_function():
          """
          My docstring brings the boys to the yard.
          """
          pass
  
      @copydoc(original_docstring_function)
      def copied_docstring_function():
          pass
  
      self.assertEqual(
          original_docstring_function.__doc__,
          copied_docstring_function.__doc__,
      )
  
imports: from zipline.testing import ZiplineTestCase
  from zipline.utils.sharedoc import copydoc
label_desc: Use image node_id 1 for calling the TestSharedoc obj's underlying member method code with example usage: obj.test_copydoc() without return types