code: def setUp(self):
      self.children = [HTML("0"), HTML("1")]
  
file_path: catboost/contrib/python/ipywidgets/py2/ipywidgets/widgets/tests/test_selectioncontainer.py
imports: from unittest import TestCase
  from traitlets import TraitError
  from ipywidgets.widgets import Accordion, HTML
label_desc: Use image node_id 1 for calling the TestAccordion obj's underlying member method code with example usage: obj.setUp() without return types