code: def test_no_special_character(self):
      text = "qwertyuioplmnbvcxza"
      for i in range(10):
          aug = nac.KeyboardAug(include_special_char=False)
          augmented_data = aug.augment(text)
          augmented_text = augmented_data[0]
          self.assertTrue(re.match("^[a-zA-Z0-9]*$", augmented_text))
  
imports: import unittest
  import re
  import json
  import os
  import nlpaug.augmenter.char
label_desc: Use image node_id 3 for calling the TestKeyboard obj's underlying member method code with example usage: obj.test_no_special_character() without return types