code: def test_add_meta(self):
      packer = TextRecogCropPacker(
          data_root=self.root.name, split="test"
      )
      instance = packer.pack_instance(self.sample)
      results = packer.add_meta([instance])
      self.assertDictEqual(
          results,
          dict(
              metainfo=dict(
                  dataset_type="TextRecogDataset", task_name="textrecog"
              ),
              data_list=instance,
          ),
      )
  
file_path: mmocr/tests/test_datasets/test_preparers/test_packers/test_textrecog_packer.py
imports: import os.path
  import tempfile
  import unittest
  import cv2
  import numpy
  from mmocr.datasets.preparers import TextRecogCropPacker, TextRecogPacker
label_desc: Use image node_id 3 for calling the TestTextRecogCropPacker obj's underlying member method code with example usage: obj.test_add_meta() without return types