code: def test_2(self):
      # issue https://github.com/undertheseanlp/underthesea/issues/684
      actual = text_normalize("đaị")
      expected = "đại"
      self.assertEqual(expected, actual)
  
imports: from unittest import TestCase
  from underthesea import text_normalize
label_desc: Use image node_id 3 for calling the TestTextNormalize obj's underlying member method code with example usage: obj.test_2() without return types