code: def test_debc016_set_item_with_nested_children():
      c1 = Component(id="1")
      c2 = Component(id="2", children=[c1])
      c3 = Component(id="3")
      c4 = Component(id="4", children=[c3])
      c5 = Component(id="5", children=[c2, c4])
  
      c3b = Component(id="3")
      assert c5["3"] == c3
      assert c5["3"] != "3"
      assert c5["3"] is not c3b
  
      c5["3"] = c3b
      assert c5["3"] is c3b
      assert c5["3"] is not c3
  
      c2b = Component(id="2")
      c5["2"] = c2b
      assert c5["4"] is c4
      assert c5["2"] is not c2
      assert c5["2"] is c2b
      with pytest.raises(KeyError):
          c5["1"]
  
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 17 for calling a global function with example usage: test_debc016_set_item_with_nested_children() without return types