code: def testZero(self):
      # zero input should return dct(lin2db(0)). Try with different sizes
      size = 1025
      val = amp2db(0)
      expected = DCT(inputSize=40, outputSize=13)(
          [val for x in range(40)]
      )
      while size > 256:
          bands, bfcc = BFCC()(zeros(size))
          self.assertEqualVector(bfcc, expected)
          size //= 2
  
file_path: essentia/test/src/unittests/spectral/test_bfcc.py
imports: from essentia_test import *
  from math import *
  import numpy
label_desc: Use image node_id 4 for calling the TestBFCC obj's underlying member method code with example usage: obj.testZero() without return types