code: def test_min_char(self):
      tokens = ["Zoology", "roku123456"]
  
      for action in ["insert", "swap", "substitute", "delete"]:
          aug = RandomCharAug(action=action, min_char=20)
          for t in tokens:
              augmented_data = aug.augment(t)
              augmented_token = augmented_data[0]
              self.assertEqual(t, augmented_token)
              self.assertEqual(len(augmented_token), len(t))
  
      self.assertTrue(len(tokens) > 0)
  
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 7 for calling the TestRandomCharReplaceAug obj's underlying member method code with example usage: obj.test_min_char() without return types