code: def test_node_attributes_are_still_mutable_on_frozen_graph(self):
      G = nx.freeze(nx.path_graph(3))
      node = G.nodes[0]
      node["node_attribute"] = True
      assert node["node_attribute"] == True
  
imports: import random
  import pytest
  import networkx
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 20 for calling the TestFunction obj's underlying member method code with example usage: obj.test_node_attributes_are_still_mutable_on_frozen_graph() without return types