code: def testRegression(self):
      # values from Matlab/Octave
      inputArray = [0, 0, 1, 0, 1]
      expected = [
          0.89442719099,
          -0.60150095500,
          -0.12078825843,
          -0.37174803446,
          0.82789503961,
      ]
      self.assertAlmostEqualVector(
          DCT(outputSize=len(inputArray))(inputArray), expected, 1e-6
      )
  
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestDCT obj's underlying member method code with example usage: obj.testRegression() without return types