new_contents: #!/usr/bin/env python2
  
  import unittest
  
  class TestSanity(unittest.TestCase):
      def setUp(self):
          self.right_answer = 4
  
      def test_sanity(self):
          self.assertEqual(2 + 2, self.right_answer)
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Add an extremely simple "sanity test" to the test suite.