code: def setUpClass(cls):
      cls.base_opts = {
          "response_pattern": "Response : ｟newline｠",
      }
  
imports: import unittest
  import copy
  import yaml
  import math
  from argparse import Namespace
  from onmt.transforms import get_transforms_cls, get_specials, make_transforms, TransformPipe
  from onmt.transforms.bart import BARTNoising
label_desc: Use image node_id 1 for calling the TestInsertMaskBeforePlaceholder obj's underlying member method code with example usage: obj.setUpClass(cls) without return types