code: def test_subclasses(self):
      r = list(range(10))
      self.assertEqual(r[TrapInt(5) : TrapInt(10)], r[5:10])
      self.assertEqual(slice(TrapInt()).indices(0), (0, 0, 1))
  
imports: import unittest
  from test import support
  import operator
label_desc: Use image node_id 5 for calling the BaseTestCase obj's underlying member method code with example usage: obj.test_subclasses() without return types