code: def test_dp(self):
      sent = "今天天气很好。"
      test_field = CnTextField(sent)
      self.assertEqual(
          [
              (1, 2, "ATT"),
              (2, 4, "SBV"),
              (3, 4, "ADV"),
              (4, 0, "HED"),
              (5, 4, "WP"),
          ],
          test_field.dp(),
      )
      sent = ""
      test_field = CnTextField(sent)
      self.assertEqual([], test_field.dp())
  
imports: import unittest
  from textflint.input.component.field.cn_text_field import *
label_desc: Use image node_id 8 for calling the TestCnTextField obj's underlying member method code with example usage: obj.test_dp() without return types