code: def test_ocr_model_from_dict(self):
      mapping = {"0": ["2"]}
      aug = OcrAug(dict_of_path=mapping)
      augmented_data = aug.augment("0000000")
      augmented_text = augmented_data[0]
      self.assertIn("2", augmented_text)
  
file_path: nlpaug/test/augmenter/char/test_ocr.py
imports: import unittest, os
  from nlpaug.augmenter.char import OcrAug
label_desc: Use image node_id 4 for calling the TestOcr obj's underlying member method code with example usage: obj.test_ocr_model_from_dict() without return types