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