code: def test_mode(self):
      swap_ins_oov = SwapEnt()
      self.assertTrue(swap_ins_oov.swap_type in ["OOV", "SwapLonger"])
  
imports: import unittest
  from textflint.input.component.sample.nercn_sample import NERCnSample
  from textflint.generation.transformation.NERCN.swap_ent import SwapEnt
label_desc: Use image node_id 1 for calling the TestSpecialSwapEnt obj's underlying member method code with example usage: obj.test_mode() without return types