Fix lint errors to enable stricter PyLint rules

webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/eval_scores_unittest.py

 # Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Unit tests for the eval_scores module.
 """
@@ skipping 33 matching lines @@
         self._fake_reference_signal_filepath, fake_reference_signal)
     self._fake_tested_signal_filepath = os.path.join(
         self._output_path, 'fake_test.wav')
     signal_processing.SignalProcessingUtils.SaveWav(
         self._fake_tested_signal_filepath, fake_tested_signal)
 
   def tearDown(self):
     """Recursively delete temporary folder."""
     shutil.rmtree(self._output_path)
 
-  def test_registered_classes(self):
+  def testRegisteredClasses(self):
     # Preliminary check.
     self.assertTrue(os.path.exists(self._output_path))
 
     # Check that there is at least one registered evaluation score worker.
     registered_classes = eval_scores.EvaluationScore.REGISTERED_CLASSES
     self.assertIsInstance(registered_classes, dict)
     self.assertGreater(len(registered_classes), 0)
 
     # Instance evaluation score workers factory with fake dependencies.
     eval_score_workers_factory = (
@@ skipping 10 matching lines @@
       # Set reference and test, then run.
       eval_score_worker.SetReferenceSignalFilepath(
           self._fake_reference_signal_filepath)
       eval_score_worker.SetTestedSignalFilepath(
           self._fake_tested_signal_filepath)
       eval_score_worker.Run(self._output_path)
 
       # Check output.
       score = data_access.ScoreFile.Load(eval_score_worker.output_filepath)
       self.assertTrue(isinstance(score, float))