      testing.test_max_min_nodes()
      testing.test_delete()
      
  if __name__=='__main__':
      main() 
</s> remove   main() </s> add  </s> remove     main() </s> add  </s> remove     test = UnitTest()
 </s> add     test = TestReverseWords() </s> remove    "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
 </s> add    "execution_count": 1,
   "metadata": {},
      testing.test_max_min_nodes()
      testing.test_delete()
      
  if __name__=='__main__':

keep keep keep keep replace
 #273: Remove nose dependency for staging/ (#283) 
staging/graphs_trees/binary_tree/test_binary_search_tree.py