code: def setUpClass(cls) -> None:
      cls._setup_kwargs.update({"custom_ops": [Diff, Distance]})
      super().setUpClass()
  
file_path: qlib/tests/test_register_ops.py
imports: import unittest
  import numpy
  from qlib.data import D
  from qlib.data.ops import ElemOperator, PairOperator
  from qlib.tests import TestAutoData
label_desc: Use image node_id 1 for calling the TestRegiterCustomOps obj's underlying member method code with example usage: obj.setUpClass(cls) without return types