      test.test_bst_successor_empty()
  
  
  if __name__ == '__main__':
      main() 
</s> remove     test.test_bst_successor_empty()
 </s> add     test.assertRaises(TypeError, test.test_bst_successor_empty)
      test.test_bst_successor_empty()
  
  
  if __name__ == '__main__':

keep keep keep keep replace
 #273: Remove nose dependency for graphs_trees/ (#277) 
graphs_trees/bst_successor/test_bst_successor.py