old_contents: from django.test import TestCase
  
  # Create your tests here.
  
  
  class SanityTest(TestCase):
      def test_one_plus_one_equals_two(self):
          self.assertEqual(1+1, 2)
  
new_contents: from django.test import TestCase
  
  # Create your tests here.
  
  
  class SanityTest(TestCase):
      def test_one_plus_one_equals_two(self):
          self.assertEqual(1 + 1, 2)
  
subject: Add whitespace around + (pep8 E225/E226)