code: def setUp(self):
      self.tree = stringtree.StringIOTree()
  
file_path: catboost/contrib/tools/cython/Cython/Tests/TestStringIOTree.py
imports: import unittest
  from Cython import StringIOTree
label_desc: Use image node_id 1 for calling the TestStringIOTree obj's underlying member method code with example usage: obj.setUp() without return types