class_docstr: For testing of AttrTree
class_docstr_tok: ["For","testing","of","AttrTree"]
code: def test_access_nodes(self):
      self.assertEqual(self.tree.A.I, 1)
      self.assertEqual(self.tree.B.II, 2)
  
imports: import pytest
  from holoviews.core.element import AttrTree
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 2 for calling the AttrTreeTest obj's underlying member method code with example usage: obj.test_access_nodes() without return types