code: def _test_plot_obj(self, model_type):
      # n_jobs > 1 is too slow so far, skip testing
      for plot_obj in self.get_plot_objs(model_type):
          self.check_common(plot_obj, model_type)
          self.check_ice_pdp(plot_obj, model_type)
  
imports: import numpy
  import pytest
  import copy
  from abc import abstractmethod
  from pdpbox.pdp import PDPResult, PDPIsolate, PDPInteract
  from pdpbox.utils import FeatureInfo, _make_list
  from conftest import DummyModel, PlotTestBase
label_desc: Use image node_id 2 for calling the _TestPDPBase obj's underlying member method code with example usage: obj._test_plot_obj(model_type) without return types