code: def test_substitute_without_target_word(self):
      texts = ["The quick brown fox jumps over the lazy dog"]
      aug = naw.RandomWordAug(action="substitute")
  
      for text in texts:
          augmented_data = aug.augment(text)
          augmented_text = augmented_data[0]
  
          self.assertIn("_", augmented_text)
          self.assertNotEqual(text, augmented_text)
  
file_path: nlpaug/test/augmenter/word/test_random_word.py
imports: import unittest
  import nlpaug.augmenter.word
label_desc: Use image node_id 2 for calling the TestRandom obj's underlying member method code with example usage: obj.test_substitute_without_target_word() without return types