code: def testDiffSize(self):
      mags = [1]
      phases = [3, 4]
      self.assertComputeFails(PolarToCartesian(), mags, phases)
  
imports: from essentia_test import *
  from math import sin, cos
label_desc: Use image node_id 3 for calling the TestPolarToCartesian obj's underlying member method code with example usage: obj.testDiffSize() without return types