How to use the zstandard.frame_header_size function in zstandard

def test_basic(self):
        # It doesn't matter that it isn't a valid frame.
        self.assertEqual(zstd.frame_header_size(b"long enough but no magic"), 6)

def test_too_small(self):
        with self.assertRaisesRegex(
            zstd.ZstdError,
            "could not determine frame header size: Src size " "is incorrect",
        ):
            zstd.frame_header_size(b"foob")

def test_empty(self):
        with self.assertRaisesRegex(
            zstd.ZstdError,
            "could not determine frame header size: Src size " "is incorrect",
        ):
            zstd.frame_header_size(b"")