code: def testZero(self):
      inputc = numpy.array([complex()] * 4, dtype="c8")
  
      self.assertEqualVector(Magnitude()(inputc), zeros(4))
  
imports: from essentia_test import *
  from math import *
label_desc: Use image node_id 1 for calling the TestMagnitude obj's underlying member method code with example usage: obj.testZero() without return types