old_contents: """
  The MIT License (MIT)
  
  Copyright (c) Serenity Software, LLC
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  """
  # pylint: disable=invalid-name,too-many-public-methods,missing-docstring
  from cahoots.confidence.normalizer import HierarchicalNormalizerChain
  from cahoots.confidence.normalizers.base import BaseNormalizer
  from cahoots.result import ParseResult
  from tests.config import TestConfig
  import unittest
  
  
  class NormalizerStub(BaseNormalizer):
  
      @staticmethod
      def test(_, __):
          return True
  
      @staticmethod
      def normalize(results):
          return results
  
  
  class HierarchicalNormalizerChainTests(unittest.TestCase):
  
      def test_normalizer_normalizes(self):
          res = [
              ParseResult('Test', 'Test', 100),
              ParseResult('Test', 'Test', 0)
          ]
  
          conf = TestConfig()
          conf.enabled_confidence_normalizers.append(NormalizerStub)
          hnc = HierarchicalNormalizerChain(conf, [], [])
          results = hnc.normalize(res)
  
          self.assertEqual(1, len(results))
          for res in results:
              self.assertIsInstance(res, ParseResult)
  
new_contents: """
  The MIT License (MIT)
  
  Copyright (c) Serenity Software, LLC
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  """
  # pylint: disable=invalid-name,too-many-public-methods,missing-docstring
  from cahoots.confidence.normalizer import HierarchicalNormalizerChain
  from cahoots.confidence.normalizers.base import BaseNormalizer
  from cahoots.result import ParseResult
  from tests.config import TestConfig
  import unittest
  
  
  class NormalizerStub(BaseNormalizer):
  
      @staticmethod
      def test(_, __):
          return True
  
      @staticmethod
      def normalize(results):
          return results
  
  
  class HierarchicalNormalizerChainTests(unittest.TestCase):
  
      def test_normalizer_normalizes(self):
          res = [
              ParseResult('Test', 'Test', 100),
              ParseResult('Test', 'Test', 0)
          ]
  
          conf = TestConfig()
          conf.enabled_confidence_normalizers.append(NormalizerStub)
          hnc = HierarchicalNormalizerChain(conf, [], [])
          results = hnc.normalize(res)
  
          self.assertEqual(1, len(results))
          self.assertIsInstance(results[0], ParseResult)
  
subject: Test tweak