new_contents: #! /usr/bin/env python
  
  import unittest
  from unit_timeside import TestRunner
  from timeside.plugins.decoder.aubio import AubioDecoder as FileDecoder
  from timeside.core import get_processor
  from timeside.core.tools.test_samples import samples
  
  
  class TestVampSpectralCentroid(unittest.TestCase):
  
      proc_id = 'vamp_spectral_centroid'
  
      def setUp(self):
          self.analyzer = get_processor(self.proc_id)()
  
      def testOnC4Scale(self):
          "runs on C4 scale"
          self.source = samples["C4_scale.wav"]
  
      def testOnSweep(self):
          "runs on sweep"
          self.source = samples["sweep.wav"]
  
      def tearDown(self):
          decoder = FileDecoder(self.source)
          (decoder | self.analyzer).run()
          results = self.analyzer.results
  
          result = results.get_result_by_id(self.proc_id)
          duration = result.audio_metadata.duration
          data_duration = result.data_object.time[-1]
  
          self.assertAlmostEqual (duration, data_duration, 1)
  
  if __name__ == '__main__':
      unittest.main(testRunner=TestRunner())
  
subject: add basic test for vamp_spectral_centroid