How to use the zstandard.BufferWithSegmentsCollection function in zstandard

def test_length(self):
        if not hasattr(zstd, "BufferWithSegmentsCollection"):
            self.skipTest("BufferWithSegmentsCollection not available")

        b1 = zstd.BufferWithSegments(b"foo", ss.pack(0, 3))
        b2 = zstd.BufferWithSegments(
            b"barbaz", b"".join([ss.pack(0, 3), ss.pack(3, 3)])
        )

        c = zstd.BufferWithSegmentsCollection(b1)
        self.assertEqual(len(c), 1)
        self.assertEqual(c.size(), 3)

        c = zstd.BufferWithSegmentsCollection(b2)
        self.assertEqual(len(c), 2)
        self.assertEqual(c.size(), 6)

        c = zstd.BufferWithSegmentsCollection(b1, b2)
        self.assertEqual(len(c), 3)
        self.assertEqual(c.size(), 9)

def test_list_input(self):
        cctx = zstd.ZstdCompressor(write_checksum=True)

        if not hasattr(cctx, "multi_compress_to_buffer"):
            self.skipTest("multi_compress_to_buffer not available")

        original = [b"foo" * 12, b"bar" * 6]
        frames = [cctx.compress(c) for c in original]
        b = cctx.multi_compress_to_buffer(original)

        self.assertIsInstance(b, zstd.BufferWithSegmentsCollection)

        self.assertEqual(len(b), 2)
        self.assertEqual(b.size(), 44)

        self.assertEqual(b[0].tobytes(), frames[0])
        self.assertEqual(b[1].tobytes(), frames[1])

def test_empty_constructor(self):
        if not hasattr(zstd, "BufferWithSegmentsCollection"):
            self.skipTest("BufferWithSegmentsCollection not available")

        with self.assertRaisesRegex(ValueError, "must pass at least 1 argument"):
            zstd.BufferWithSegmentsCollection()

def test_argument_validation(self):
        if not hasattr(zstd, "BufferWithSegmentsCollection"):
            self.skipTest("BufferWithSegmentsCollection not available")

        with self.assertRaisesRegex(TypeError, "arguments must be BufferWithSegments"):
            zstd.BufferWithSegmentsCollection(None)

        with self.assertRaisesRegex(TypeError, "arguments must be BufferWithSegments"):
            zstd.BufferWithSegmentsCollection(
                zstd.BufferWithSegments(b"foo", ss.pack(0, 3)), None
            )

        with self.assertRaisesRegex(
            ValueError, "ZstdBufferWithSegments cannot be empty"
        ):
            zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b"", b""))

self.skipTest("BufferWithSegmentsCollection not available")

        b1 = zstd.BufferWithSegments(b"foo", ss.pack(0, 3))
        b2 = zstd.BufferWithSegments(
            b"barbaz", b"".join([ss.pack(0, 3), ss.pack(3, 3)])
        )

        c = zstd.BufferWithSegmentsCollection(b1)
        self.assertEqual(len(c), 1)
        self.assertEqual(c.size(), 3)

        c = zstd.BufferWithSegmentsCollection(b2)
        self.assertEqual(len(c), 2)
        self.assertEqual(c.size(), 6)

        c = zstd.BufferWithSegmentsCollection(b1, b2)
        self.assertEqual(len(c), 3)
        self.assertEqual(c.size(), 9)

)
        b = b"".join([original[2], original[3], original[4]])
        b2 = zstd.BufferWithSegments(
            b,
            struct.pack(
                "=QQQQQQ",
                0,
                len(original[2]),
                len(original[2]),
                len(original[3]),
                len(original[2]) + len(original[3]),
                len(original[4]),
            ),
        )

        c = zstd.BufferWithSegmentsCollection(b1, b2)

        result = cctx.multi_compress_to_buffer(c)

        self.assertEqual(len(result), len(frames))

        for i, frame in enumerate(frames):
            self.assertEqual(result[i].tobytes(), frame)

b = b"".join([frames[2].tobytes(), frames[3].tobytes(), frames[4].tobytes()])
        b2 = zstd.BufferWithSegments(
            b,
            struct.pack(
                "=QQQQQQ",
                0,
                len(frames[2]),
                len(frames[2]),
                len(frames[3]),
                len(frames[2]) + len(frames[3]),
                len(frames[4]),
            ),
        )

        c = zstd.BufferWithSegmentsCollection(b1, b2)

        dctx = zstd.ZstdDecompressor()
        decompressed = dctx.multi_decompress_to_buffer(c)

        self.assertEqual(len(decompressed), 5)
        for i in range(5):
            self.assertEqual(decompressed[i].tobytes(), original[i])

def test_argument_validation(self):
        if not hasattr(zstd, "BufferWithSegmentsCollection"):
            self.skipTest("BufferWithSegmentsCollection not available")

        with self.assertRaisesRegex(TypeError, "arguments must be BufferWithSegments"):
            zstd.BufferWithSegmentsCollection(None)

        with self.assertRaisesRegex(TypeError, "arguments must be BufferWithSegments"):
            zstd.BufferWithSegmentsCollection(
                zstd.BufferWithSegments(b"foo", ss.pack(0, 3)), None
            )

        with self.assertRaisesRegex(
            ValueError, "ZstdBufferWithSegments cannot be empty"
        ):
            zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b"", b""))