code: def test_tokens(self):
      for sent in sents:
          test_field = CnTextField(sent)
          self.assertEqual([k for k in sent], test_field.tokens)
  
imports: import unittest
  from textflint.input.component.field.cn_text_field import *
label_desc: Use image node_id 5 for calling the TestCnTextField obj's underlying member method code with example usage: obj.test_tokens() without return types