code: def test_favorable_value_checked(self):
      p = pd.Series([50, 100, 150])
      q = pd.Series([25, 115, 60, 30, 70])
      fav = 4
      with self.assertRaises(ValueError):
          ot_distance(p, q, pos_label=fav)
  
imports: import numpy
  import pandas
  from aif360.metrics.ot_metric import _normalize, _transform, _evaluate
  from aif360.sklearn.metrics import ot_distance
  from ot import emd2
  import unittest
  from unittest import TestCase
label_desc: Use image node_id 7 for calling the TestOtBiasScan obj's underlying member method code with example usage: obj.test_favorable_value_checked() without return types