code: def test_classify(self):
      y1 = self.model.classify(self.dtest)
      self.assertEqual(len(y1), len(self.dtest))
      self.assertEqual(y1["class"].dtype, self.type)
      self.assertEqual(
          set(y1.column_names()), set(["class", "probability"])
      )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import math
  import uuid
  import random
  import copy
  from turicreate.toolkits import evaluation
  from turicreate.toolkits._main import ToolkitError
  import shutil
  import numpy
  from array import array
  import os
label_desc: Use image node_id 9 for calling the DecisionTreeClassifierTest obj's underlying member method code with example usage: obj.test_classify() without return types