Add tests for jebp_utils

src/jeb_utils/jebp_utils.py

@@ -90,7 +90,7 @@ async def readmsg(reader: asyncio.StreamReader, aesgcm: AESGCM = None, aesnonce:
         return aesgcm.decrypt(aesnonce, m, None)
     return m
 
-def pack_fields(*fields: bytes) -> bytes:
+def pack_fields(fields: list[bytes]) -> bytes:
     '''
     Packs the fields into a compact bytestring.
 
@@ -100,11 +100,12 @@ def pack_fields(*fields: bytes) -> bytes:
     :return: The result
     :rtype: bytes
     '''
+
     result = b''
     for field in fields:
-        field_length = utils.int_to_bytes(len(field))
-        field_length_length = utils.int_to_bytes(len(field_length))
-        result += field_length_length + field_length + field
+        payload_length = utils.int_to_bytes(len(field))
+        payload_length_length = len(payload_length).to_bytes(1)
+        result += payload_length_length + payload_length + field
     return result
 
 def unpack_fields(raw: bytes) -> Sequence[bytes]: