code: def testEmptyWav(self):
      filename = join(
          testdata.audio_dir, "generated", "empty", "empty.aiff"
      )
      self.assertEqualVector(
          MonoLoader(
              filename=filename, downmix="left", sampleRate=44100
          )(),
          [],
      )
  
imports: from essentia_test import *
  from numpy import fabs
label_desc: Use image node_id 7 for calling the TestMonoLoader obj's underlying member method code with example usage: obj.testEmptyWav() without return types