docstr: Test the show call against the VisualPipeline
docstr_tok: ["Test","the","show","call","against","the","VisualPipeline"]
code: def test_pipeline_show(self):
      """
      Test the show call against the VisualPipeline
      """
  
      pipeline = VisualPipeline(
          [
              ("a", mock.MagicMock(MockTransformer())),
              ("b", mock.MagicMock(MockVisualTransformer())),
              ("c", mock.MagicMock(MockTransformer())),
              ("d", mock.MagicMock(MockVisualTransformer())),
              ("e", mock.MagicMock(MockEstimator())),
          ]
      )
  
      pipeline.show()
      pipeline.steps[1][1].show.assert_called_once_with(outpath=None)
      pipeline.steps[3][1].show.assert_called_once_with(outpath=None)
  
imports: import os
  import pytest
  from unittest import mock
  from yellowbrick.base import Visualizer
  from yellowbrick.pipeline import VisualPipeline
  from sklearn.pipeline import Pipeline
  from sklearn.base import BaseEstimator, TransformerMixin
label_desc: Use image node_id 3 for calling the TestVisualPipeline obj's underlying member method code with example usage: obj.test_pipeline_show() without return types