old_contents: #coding:utf8
  
  import unittest
  
  
  class TestFunctions(unittest.TestCase):
  
      def first(self):
          assertEqual('test', 'test')
  
      def second(self):
          """second test"""
          assertEqual('2','2')
  
  
new_contents: # coding: utf-8
  
  import unittest
  
  
  class TestFunctions(unittest.TestCase):
  
      def first(self):
          self.assertEqual('test', 'test')
  
      def second(self):
          """second test"""
          self.assertEqual('2','2')
  
  
subject: Add self to test cases