code: def test_members(self):
      f = digital_filter()
      assert_equal(f.order, 7)
      f = digital_filter(5)
      assert_equal(f.order, 5)
      f(fvec())
  
file_path: aubio/python/tests/test_filter.py
imports: from numpy.testing import TestCase, assert_equal, assert_almost_equal
  from aubio import fvec, digital_filter
  from utils import array_from_text_file
label_desc: Use image node_id 1 for calling the aubio_filter_test_case obj's underlying member method code with example usage: obj.test_members() without return types