code: def test_mfcc_coeffs(self):
      f = filterbank(40, 512)
      c = cvec(512)
      f.set_mel_coeffs_slaney(44100)
      c.norm[:] = np.random.random((int(512 / 2) + 1,)).astype(
          float_type
      )
      assert_equal(f(c) < 1.0, True)
      assert_equal(f(c) > 0.0, True)
  
imports: import numpy
  from numpy.testing import TestCase, assert_equal, assert_almost_equal
  from aubio import cvec, filterbank, float_type
  from utils import array_from_text_file
label_desc: Use image node_id 7 for calling the aubio_filterbank_test_case obj's underlying member method code with example usage: obj.test_mfcc_coeffs() without return types