code: def test_text_4(self):
      # string in byte
      input = "đi học".encode("utf-8")
      output = Text(input)
      self.assertTrue(is_unicode(output))
  
file_path: underthesea/tests/feature_engineering/test_text.py
imports: from unittest import TestCase
  from underthesea.feature_engineering.text import Text, is_unicode
label_desc: Use image node_id 4 for calling the TestText obj's underlying member method code with example usage: obj.test_text_4() without return types