code: def test_single_word(self):
      texts = ["Zoology", "roku123456"]
      aug = nac.KeyboardAug()
      for text in texts:
          augmented_data = aug.augment(text)
          augmented_text = augmented_data[0]
          self.assertNotEqual(text, augmented_text)
  
      self.assertTrue(len(texts) > 0)
  
imports: import unittest
  import re
  import json
  import os
  import nlpaug.augmenter.char
label_desc: Use image node_id 1 for calling the TestKeyboard obj's underlying member method code with example usage: obj.test_single_word() without return types