code: def test_construction_with_children(self):
      html = widgets.HTML("some html")
      slider = widgets.IntSlider()
      box = widgets.Box([html, slider])
      children_state = box.get_state()["children"]
      assert children_state == [
          widgets.widget._widget_to_json(html, None),
          widgets.widget._widget_to_json(slider, None),
      ]
  
file_path: catboost/contrib/python/ipywidgets/py3/ipywidgets/widgets/tests/test_widget_box.py
imports: from unittest import TestCase
  from traitlets import TraitError
  import ipywidgets
label_desc: Use image node_id 2 for calling the TestBox obj's underlying member method code with example usage: obj.test_construction_with_children() without return types