code: def testZero(self):
      input = [0] * 100000
      envelope = Envelope(
          sampleRate=44100, attackTime=5, releaseTime=100
      )(input)
      self.assertEqualVector(envelope, input)
  
file_path: essentia/test/src/unittests/standard/test_envelope.py
imports: from essentia_test import *
  import numpy
label_desc: Use image node_id 3 for calling the TestEnvelope obj's underlying member method code with example usage: obj.testZero() without return types