code: def test_plot(self, params):
      self._test_plot(params)
  
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 6 for calling the TestPDPIsolate obj's underlying member method code with example usage: obj.test_plot(params) without return types