code: def test_vector(self):
      a = fvec()
      len(a)
      _ = a[0]
      np.array(a)
      a = fvec(1)
      a = fvec(10)
      _ = a.T
  
imports: import numpy
  from numpy.testing import TestCase, assert_equal, assert_almost_equal
  from aubio import fvec, zero_crossing_rate, alpha_norm, min_removal
  from aubio import float_type
label_desc: Use image node_id 5 for calling the aubio_fvec_test_case obj's underlying member method code with example usage: obj.test_vector() without return types