code: def testEmpty(self):
      self.assertComputeFails(MaxMagFreq(), [])
  
file_path: essentia/test/src/unittests/spectral/test_maxmagfreq.py
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestMaxMagFreq obj's underlying member method code with example usage: obj.testEmpty() without return types