Method test_pcm_has_no_fact_chunk

Lib/test/test_wave.py:375–394

(self)

        self.assertEqual(fact_samples, nframes)

    def test_pcm_has_no_fact_chunk(self):
        with tempfile.NamedTemporaryFile(delete_on_close=False) as fp:
            filename = fp.name
        self.addCleanup(unlink, filename)

        with wave.open(filename, 'wb') as w:
            w.setnchannels(1)
            w.setsampwidth(2)
            w.setframerate(22050)
            w.writeframes(b'\x00\x00' * 100)

        with open(filename, 'rb') as f:
            f.read(12)
            while True:
                chunk_id = f.read(4)
                if len(chunk_id) < 4:
                    break
                chunk_size = struct.unpack('<L', f.read(4))[0]
                self.assertNotEqual(chunk_id, b'fact')
                f.seek(chunk_size + (chunk_size & 1), 1)

    @support.subTests('arg', (
        # rounds to 0, should raise: