def METHOD_NAME(self):
    b = struct.pack('>LLLLL', sunau.AUDIO_FILE_MAGIC, 20, 0,
                    sunau.AUDIO_FILE_ENCODING_LINEAR_8, 11025)
    with self.assertRaisesRegex(sunau.Error, 'header size too small'):
        sunau.open(io.BytesIO(b))