code: def test_debc009_del_item_full_tree():
      c = nested_tree()[0]
      keys = reversed([k for k in c])
      for key in keys:
          c[key]
          del c[key]
          with pytest.raises(KeyError):
              c[key]
  
imports: import json
  import plotly
  import pytest
  from dash import __version__, Dash
  from dash import html
  from dash.development.base_component import Component
  from dash import dcc, Input, Output
label_desc: Use image node_id 10 for calling a global function with example usage: test_debc009_del_item_full_tree() without return types