code: def test_slice(self):
      self.o.ind = 1
      self.o2.ind = 3
      self.n.ind = 2
      self.n2.ind = 4
      self.assertEqual(self.seq[self.o : self.o2], self.seq[1:3])
      self.assertEqual(self.seq[self.n : self.n2], self.seq[2:4])
  
imports: import unittest
  from test import support
  import operator
label_desc: Use image node_id 3 for calling the SeqTestCase obj's underlying member method code with example usage: obj.test_slice() without return types