def test_adpcm2lin(self):
        self.assertEqual(audioop.adpcm2lin(b'\x07\x7f\x7f', 1, None),
                         (b'\x00\x00\x00\xff\x00\xff', (-179, 40)))
        self.assertEqual(audioop.adpcm2lin(bytearray(b'\x07\x7f\x7f'), 1, None),
                         (b'\x00\x00\x00\xff\x00\xff', (-179, 40)))
        self.assertEqual(audioop.adpcm2lin(memoryview(b'\x07\x7f\x7f'), 1, None),
                         (b'\x00\x00\x00\xff\x00\xff', (-179, 40)))
        self.assertEqual(audioop.adpcm2lin(b'\x07\x7f\x7f', 2, None),
                         (packs[2](0, 0xb, 0x29, -0x16, 0x72, -0xb3), (-179, 40)))
        self.assertEqual(audioop.adpcm2lin(b'\x07\x7f\x7f', 3, None),
                         (packs[3](0, 0xb00, 0x2900, -0x1600, 0x7200,
                                   -0xb300), (-179, 40)))
        self.assertEqual(audioop.adpcm2lin(b'\x07\x7f\x7f', 4, None),
                         (packs[4](0, 0xb0000, 0x290000, -0x160000, 0x720000,
                                   -0xb30000), (-179, 40)))

        # Very cursory test
        for w in 1, 2, 3, 4:
            self.assertEqual(audioop.adpcm2lin(b'\0' * 5, w, None),
                             (b'\0' * w * 10, (0, 0)))