code: def test_basic(self):
      self.o.ind = -2
      self.n.ind = 2
      self.assertEqual(operator.index(self.o), -2)
      self.assertEqual(operator.index(self.n), 2)
  
imports: import unittest
  from test import support
  import operator
label_desc: Use image node_id 2 for calling the BaseTestCase obj's underlying member method code with example usage: obj.test_basic() without return types