code: def test_close(self):
      with open(self.sndfilepath, "rb") as testfile:
          f = self.f = self.module.open(testfile)
          self.assertFalse(testfile.closed)
          f.close()
          self.assertEqual(testfile.closed, self.close_fd)
      with open(TESTFN, "wb") as testfile:
          fout = self.fout = self.module.open(testfile, "wb")
          self.assertFalse(testfile.closed)
          with self.assertRaises(self.module.Error):
              fout.close()
          self.assertEqual(testfile.closed, self.close_fd)
          fout.close()
  
imports: from test.support import findfile
  from test.support.os_helper import TESTFN, unlink
  import array
  import io
  import pickle
label_desc: Use image node_id 3 for calling the AudioTestsWithSourceFile obj's underlying member method code with example usage: obj.test_close() without return types