code: def setUp(self):
      if not default_test_sound:
          skipTest(no_sounds_msg)
  
imports: from numpy.testing import TestCase, assert_equal
  from aubio import source
  from utils import list_all_sounds, parse_file_samplerate
  import unittest
  from _tools import assert_raises, assert_equal, assert_warns
  from _tools import parametrize, skipTest
label_desc: Use image node_id 1 for calling the Test_aubio_source_test_case obj's underlying member method code with example usage: obj.setUp() without return types