code: def test_create_word(self):
      self.assertTrue(swap_ins.create_word("小 明 在 看 [MASK] [MASK] 。"))
      self.assertTrue(not swap_ins.create_word("小 明 在 看 [MASK] [MASK]"))
  
file_path: textflint/test/generation/transformation/CWS/test_cn_mlm.py
imports: import unittest
  from textflint.generation.transformation.CWS.cn_mlm import CnMLM
  from textflint.input.component.sample.cws_sample import CWSSample
label_desc: Use image node_id 3 for calling the TestCnMLM obj's underlying member method code with example usage: obj.test_create_word() without return types