code: def testZeroFreq(self):
      self.assertAlmostEqual(MaxMagFreq()([10, 1, 2, 3]), 0)
  
file_path: essentia/test/src/unittests/spectral/test_maxmagfreq.py
imports: from essentia_test import *
label_desc: Use image node_id 3 for calling the TestMaxMagFreq obj's underlying member method code with example usage: obj.testZeroFreq() without return types