code: def _test_real_plot(self, plot_obj, plot_params, extra_plot_settings):
      for extra_params in extra_plot_settings:
          curr_plot_params = copy.deepcopy(plot_params)
          curr_plot_params.update(extra_params)
          fig, axes = plot_obj.plot(**curr_plot_params)
          self.close_plt(curr_plot_params)
          assert fig is not None
          if curr_plot_params.get("engine", "plotly") == "matplotlib":
              assert axes is not None
          else:
              assert axes is None
  
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 4 for calling the _TestPDPBase obj's underlying member method code with example usage: obj._test_real_plot(plot_obj, plot_params, extra_plot_settings) without return types