How to use the zstandard.FRAME_HEADER function in zstandard

def test_attributes(self):
        params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x00\x00")
        self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
        self.assertEqual(params.window_size, 1024)
        self.assertEqual(params.dict_id, 0)
        self.assertFalse(params.has_checksum)

        # Lowest 2 bits indicate a dictionary and length. Here, the dict id is 1 byte.
        params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x01\x00\xff")
        self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
        self.assertEqual(params.window_size, 1024)
        self.assertEqual(params.dict_id, 255)
        self.assertFalse(params.has_checksum)

        # Lowest 3rd bit indicates if checksum is present.
        params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x04\x00")
        self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
        self.assertEqual(params.window_size, 1024)
        self.assertEqual(params.dict_id, 0)
        self.assertTrue(params.has_checksum)

        # Upper 2 bits indicate content size.
        params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x40\x00\xff\x00")
        self.assertEqual(params.content_size, 511)
        self.assertEqual(params.window_size, 1024)
        self.assertEqual(params.dict_id, 0)
        self.assertFalse(params.has_checksum)

        # Window descriptor is 2nd byte after frame header.
        params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x00\x40")
        self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
        self.assertEqual(params.window_size, 262144)

with self.assertRaises(TypeError):
            dctx.decompress_content_dict_chain((b"foo", b"bar"))

        with self.assertRaisesRegex(ValueError, "empty input chain"):
            dctx.decompress_content_dict_chain([])

        with self.assertRaisesRegex(ValueError, "chunk 0 must be bytes"):
            dctx.decompress_content_dict_chain([u"foo"])

        with self.assertRaisesRegex(ValueError, "chunk 0 must be bytes"):
            dctx.decompress_content_dict_chain([True])

        with self.assertRaisesRegex(
            ValueError, "chunk 0 is too small to contain a zstd frame"
        ):
            dctx.decompress_content_dict_chain([zstd.FRAME_HEADER])

        with self.assertRaisesRegex(ValueError, "chunk 0 is not a valid zstd frame"):
            dctx.decompress_content_dict_chain([b"foo" * 8])

        no_size = zstd.ZstdCompressor(write_content_size=False).compress(b"foo" * 64)

        with self.assertRaisesRegex(
            ValueError, "chunk 0 missing content size in frame"
        ):
            dctx.decompress_content_dict_chain([no_size])

        # Corrupt first frame.
        frame = zstd.ZstdCompressor().compress(b"foo" * 64)
        frame = frame[0:12] + frame[15:]
        with self.assertRaisesRegex(
            zstd.ZstdError, "chunk 0 did not decompress full frame"

def test_invalid_input_sizes(self):
        with self.assertRaisesRegex(zstd.ZstdError, "not enough data for frame"):
            zstd.get_frame_parameters(b"")

        with self.assertRaisesRegex(zstd.ZstdError, "not enough data for frame"):
            zstd.get_frame_parameters(zstd.FRAME_HEADER)

def test_constants(self):
        self.assertEqual(zstd.MAX_COMPRESSION_LEVEL, 22)
        self.assertEqual(zstd.FRAME_HEADER, b"\x28\xb5\x2f\xfd")