docstr: runs on sweep
docstr_tok: ["runs","on","sweep"]
code: def testOnSweep(self):
      "runs on sweep"
      self.source = samples["sweep.wav"]
  
      self.expected = {"mean_dc_shift": 0.004}
  
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 2 for calling the TestAnalyzerDC obj's underlying member method code with example usage: obj.testOnSweep() without return types