code: def setUpClass(cls):
      cls.data = sample_data
      cls.open = cls.data["open"]
  
imports: from .config import sample_data
  from .context import pandas_ta
  from unittest import TestCase
  from pandas import DataFrame
label_desc: Use image node_id 1 for calling the TestVolumeExtension obj's underlying member method code with example usage: obj.setUpClass(cls) without return types