code: def test_transform_1(self):
      transformer = UnicodeTransformer()
      s = "tôi đi học"
      self.assertEqual(unicode, type(transformer.transform(s)))
  
imports: from unittest import TestCase
  import sys
  from underthesea.feature_engineering.unicode import UnicodeTransformer
label_desc: Use image node_id 1 for calling the TestUnicodeTransformer obj's underlying member method code with example usage: obj.test_transform_1() without return types