code: def setUpClass(cls):
      master_seed(seed=1234, set_tensorflow=True)
      super().setUpClass()
  
      cls.n_test = 10
      cls.x_test_mnist = cls.x_test_mnist[0 : cls.n_test]
      cls.y_test_mnist = cls.y_test_mnist[0 : cls.n_test]
  
file_path: adversarial-robustness-toolbox/tests/attacks/test_shapeshifter.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import unittest
  import importlib
  import tensorflow
  import numpy
  from tests.utils import TestBase, master_seed
label_desc: Use image node_id 1 for calling the TestShapeShifter obj's underlying member method code with example usage: obj.setUpClass(cls) without return types