code: def test_markers(self):
      assert not self.tree.allmarkers()
  
file_path: catboost/contrib/tools/cython/Cython/Tests/TestStringIOTree.py
imports: import unittest
  from Cython import StringIOTree
label_desc: Use image node_id 2 for calling the TestStringIOTree obj's underlying member method code with example usage: obj.test_markers() without return types