code: def test_get_text_instances(self, text_repr_type):
      postprocessor = TextSnakePostprocessor(
          text_repr_type=text_repr_type
      )
  
      results = postprocessor.get_text_instances(
          torch.squeeze(self.pred_result1), self.data_sample
      )
      self.assertEqual(len(results.pred_instances.polygons), 1)
  
      results = postprocessor.get_text_instances(
          torch.squeeze(self.pred_result2), self.data_sample
      )
      self.assertEqual(len(results.pred_instances.polygons), 0)
  
file_path: mmocr/tests/test_models/test_textdet/test_postprocessors/test_textsnake_postprocessor.py
imports: import copy
  import unittest
  import numpy
  import torch
  from mmengine.structures import InstanceData
  from parameterized import parameterized
  from mmocr.models.textdet.postprocessors import TextSnakePostprocessor
  from mmocr.structures import TextDetDataSample
label_desc: Use image node_id 2 for calling the TestTextSnakePostProcessor obj's underlying member method code with example usage: obj.test_get_text_instances(text_repr_type) without return types