code: def test_mode(self):
      swap_ins_oov = SwapEnt()
      self.assertTrue(
          swap_ins_oov.swap_type
          in ["CrossCategory", "OOV", "SwapLonger"]
      )
  
imports: import unittest
  from textflint.input.component.sample.ner_sample import NERSample
  from textflint.generation.transformation.NER.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