class_docstr: A unittest class for testing Backdoor Poisoning attack.
code: def setUp(self):
      master_seed(seed=301)
      self.backdoor_path = os.path.join(
          os.path.join(
              os.path.dirname(
                  os.path.dirname(os.path.dirname(__file__))
              )
          ),
          "utils",
          "data",
          "backdoors",
          "alert.png",
      )
      super().setUp()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import os
  import logging
  import unittest
  import numpy
  from art.attacks.poisoning.backdoor_attack import PoisoningAttackBackdoor
  from art.attacks.poisoning.perturbations import add_pattern_bd, add_single_bd, insert_image
  from art.utils import to_categorical
  from tests.utils import TestBase, master_seed, get_image_classifier_kr
label_desc: Use image node_id 1 for calling the TestBackdoorAttack obj's underlying member method code with example usage: obj.setUp() without return types