code: def transformer_test(self, transformer):
      image_set = ImageSet.read(self.image_path)
      transformed = transformer(image_set)
      transformed.get_image()
  
      image_set = ImageSet.read(self.image_path, self.sc)
      transformed = transformer(image_set)
      images = transformed.get_image()
      images.count()
  
imports: import pytest
  import cv2
  from zoo.common.nncontext import *
  from zoo.feature.image import *
label_desc: Use image node_id 3 for calling the Test_Image_Set obj's underlying member method code with example usage: obj.transformer_test(transformer) without return types