code: def __init__(self, ax=None, **kwargs):
      self.ax = ax
      self.fit = mock.MagicMock()
      self.finalize = mock.MagicMock()
      self.show = mock.MagicMock()
      self.set_title = mock.MagicMock()
  
imports: import pytest
  from unittest import mock
  from yellowbrick.base import Visualizer
  from yellowbrick.utils.wrapper import *
  from yellowbrick.exceptions import YellowbrickAttributeError, YellowbrickTypeError
  from sklearn.naive_bayes import MultinomialNB
  from sklearn.naive_bayes import GaussianNB
label_desc: Use image node_id 1 to create a new MockVisualizer object from inherited base classes: Visualizer with example: obj = MockVisualizer(ax)