code: def _get_raw_data(self):
      return ["a", "a", "b", "c"], pd.Series(data=[0, 0, 1, 1])
  
imports: import numpy
  import pandas
  import pytest
  import fairlearn.metrics
  from .utils import _get_raw_MetricFrame
label_desc: Use image node_id 1 for calling the TestSingleFeature obj's underlying member method code with example usage: obj._get_raw_data() and returns: list,  pd