old_contents: from hello_world import hello_world
  
  from unittest import TestCase
  
  
  class BasicTest(TestCase):
      def test_basic_hello_world(self):
          """
          Test basic hello world messaging
          """
          self.assertEqual(hello_world(), 'Hello, World!')
  
new_contents: from hello_world import hello_world
  
  from unittest import TestCase
  
  
  class BasicTest(TestCase):
      def test_basic_hello_world(self):
          """
          Test basic hello world messaging
          """
  
          self.assertEqual(hello_world(), 'Hello, World!')
  
subject: Update test_basic.py