code: def test_df_nan(self):
      df = get_ts_df()
      df["value"][0] = np.nan
      with pytest.raises(AssertionError):
          RollDataset(
              df=df,
              lookback=2,
              horizon=1,
              feature_col=["extra feature"],
              target_col=["value"],
              id_col="id",
          )
  
file_path: analytics-zoo/pyzoo/test/zoo/chronos/data/utils/test_roll_dataset.py
imports: import pytest
  import numpy
  import pandas
  import random
  from zoo.chronos.data import TSDataset
  from zoo.chronos.data.utils.roll_dataset import RollDataset
label_desc: Use image node_id 5 for calling the TestRollDataset obj's underlying member method code with example usage: obj.test_df_nan() without return types