anchor.diff:  
   ==== Using unittest library
   
  -An easy example : 
  +===== A basic example : 
   
   [source,python]
   ----
  
positive.code: 
  FAILED (failures=1)
  Process finished with exit code 0
  ----
negative.code:         self.assertEqual(res, 3)
  ----
  
  The output is now : 
  
  ----
  ======================================================================
  