docstr: runs on C4 Scale
docstr_tok: ["runs","on","C4","Scale"]
code: def testOnScale(self):
      "runs on C4 Scale"
      self.source = samples["C4_scale.wav"]
      self.expected = {"mean_dc_shift": 0.034}
  
file_path: TimeSide/tests/test_analyzer_dc.py
imports: import unittest
  from unit_timeside import TestRunner
  from timeside.plugins.decoder.aubio import AubioDecoder
  from timeside.plugins.analyzer.dc import MeanDCShift
  from timeside.core.tools.test_samples import samples
label_desc: Use image node_id 3 for calling the TestAnalyzerDC obj's underlying member method code with example usage: obj.testOnScale() without return types