code: def test_register_dynamic_attr(he_pm: PluginManager) -> None:
      class A:
          def __getattr__(self, name):
              if name[0] != "_":
                  return 42
              raise AttributeError()
  
      a = A()
      he_pm.register(a)
      assert not he_pm.get_hookcallers(a)
  
imports: import sys
  from typing import Any
  from typing import List
  import pytest
  from pluggy import HookCallError
  from pluggy import HookimplMarker
  from pluggy import HookspecMarker
  from pluggy import PluginManager
  from pluggy import PluginValidationError
label_desc: Use image node_id 4 for calling a global function with example usage: test_register_dynamic_attr(he_pm) and returns: int