code: def test___str__(self) -> None:
      prop = bcpc.TypeOfAttr(Instance(Parent), "p0", Instance(Child0))
      assert (
          str(prop)
          == "TypeOfAttr(Instance(Parent), 'p0', Instance(Child0))"
      )
  
imports: from __future__ import annotations
  import pytest
  from bokeh.core.has_props import HasProps, Local
  from bokeh.core.properties import Either, Instance, Int, String
  from tests.support.util.api import verify_all
  import bokeh.core.property.constraints
label_desc: Use image node_id 1 for calling the Test_TypeOfAttr obj's underlying member method code with example usage: obj.test___str__() without return types