code: def setUpClass(cls):
      cls.data = sample_data
      cls.islong = cls.data["close"] > pandas_ta.sma(
          cls.data["close"], length=50
      )
  
file_path: pandas-ta/tests/test_ext_indicator_performance.py
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 TestPerformaceExtension obj's underlying member method code with example usage: obj.setUpClass(cls) without return types