code: def test_get_value(self):
      # test get value
      self.assertEqual(postag, sample.get_value("postag"))
      self.assertEqual(head, sample.get_value("head"))
      self.assertEqual(deprel, sample.get_value("deprel"))
  
file_path: textflint/test/input/component/sample/test_dp_sample.py
imports: import unittest
  from textflint.input.component.sample.dp_sample import *
label_desc: Use image node_id 3 for calling the TestDPSample obj's underlying member method code with example usage: obj.test_get_value() without return types