code: def test_ot_matcher(self):
      _dirpath = os.path.join(
          os.path.dirname(os.path.abspath(__file__)), "data"
      )
  
      for case in [
          "test_case_1",
      ]:
          with open(os.path.join(_dirpath, case + ".json"), "r") as f:
              CASE = json.load(f)
  
          with self.subTest(instance=case):
              _test_ot(self, CASE)
  
imports: import unittest
  import os
  import json
  from typing import Dict
label_desc: Use image node_id 1 for calling the TestOTMatchingExplainer obj's underlying member method code with example usage: obj.test_ot_matcher() without return types