code: def test_cvec_repr(self):
      win_s = 512
      c = cvec(win_s)
      expected_repr = "aubio cvec of {:d} elements".format(
          win_s // 2 + 1
      )
      self.assertEqual(repr(c), expected_repr)
  
imports: import numpy
  from numpy.testing import TestCase, assert_equal
  from aubio import cvec, fvec, float_type
label_desc: Use image node_id 12 for calling the aubio_cvec_test_case obj's underlying member method code with example usage: obj.test_cvec_repr() without return types