code: def setup_method(self, method):
      self.easy_data = pd.DataFrame(
          {
              "A": np.random.randn(10),
              "B": np.random.randn(10),
              "C": np.random.randn(10),
              "datetime": pd.date_range("1/1/2019", periods=10),
          }
      )
      self.lookback = random.randint(1, 5)
  
file_path: BigDL/python/chronos/test/bigdl/chronos/data/utils/test_roll.py
imports: import pytest
  import pandas
  import numpy
  import random
  from unittest import TestCase
  from bigdl.chronos.data.utils.roll import roll_timeseries_dataframe
  from ...None import op_torch, op_tf2
label_desc: Use image node_id 1 for calling the TestRollTimeSeries obj's underlying member method code with example usage: obj.setup_method(method) without return types