old_contents: 
  import unittest
  
  
  class TestCase(unittest.TestCase):
      """
      Parent TestCase to use for all tests.
      """
      pass
  
new_contents: 
  import unittest
  
  
  class TestCase(unittest.TestCase):
      """
      Parent TestCase to use for all tests.
      """
      pass
  
      def assertGreaterEqual(self, first, second, msg=None):
          """
          Test that first is respectively >= than second
          depending on the method name. If not, the test will fail.
          """
          if first >= second:
              pass
          else:
              self.fail(msg=msg)
  
subject: Implement unittest.TestCase.assertGreaterEqual for pythons less than 2.7