code: def test_mono_text_gatherer(self):
      data_root = "dummpy"
      img_dir = "dummy_img"
      ann_dir = "dummy_ann"
      ann_name = "dummy_ann.json"
      split = "train"
      gatherer = MonoGatherer(
          data_root=data_root,
          img_dir=img_dir,
          ann_dir=ann_dir,
          ann_name=ann_name,
          split=split,
      )
      gather_img_dir, ann_path = gatherer()
      self.assertEqual(gather_img_dir, osp.join(data_root, img_dir))
      self.assertEqual(ann_path, osp.join(data_root, ann_dir, ann_name))
  
imports: import os.path
  import unittest
  from mmocr.datasets.preparers.gatherers import MonoGatherer
label_desc: Use image node_id 1 for calling the TestMonoGatherer obj's underlying member method code with example usage: obj.test_mono_text_gatherer() without return types