code: def testInvalidInput(self):
      # mel bands should fail for a spectrum with less than 2 bins
      self.assertComputeFails(BFCC(), [])
      self.assertComputeFails(BFCC(), [0.5])
  
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 5 for calling the TestBFCC obj's underlying member method code with example usage: obj.testInvalidInput() without return types