code: def test_lang_th(self):
      text = "ฤฤฤฤ ฤฏณ"
      aug = nac.KeyboardAug(lang="th")
      augmented_data = aug.augment(text)
      augmented_text = augmented_data[0]
      self.assertNotEqual(text, augmented_text)
  
imports: import unittest
  import re
  import json
  import os
  import nlpaug.augmenter.char
label_desc: Use image node_id 11 for calling the TestKeyboard obj's underlying member method code with example usage: obj.test_lang_th() without return types