code: def test_swap_random(self):
      text = "quick brown jumps over lazy"
      aug = RandomCharAug(action="swap", swap_mode="random", min_char=4)
      augmented_data = aug.augment(text)
      augmented_text = augmented_data[0]
      self.assertNotEqual(text, augmented_text)
      self.assertEqual(len(augmented_text), len(text))
  
file_path: nlpaug/test/augmenter/char/test_random_char.py
imports: import unittest
  from nlpaug.augmenter.char.random import RandomCharAug
label_desc: Use image node_id 9 for calling the TestRandomCharReplaceAug obj's underlying member method code with example usage: obj.test_swap_random() without return types