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from datetime import datetime

import pytest

from src.shared.utils.cursor import (

CursorDirection,

decode_cursor,

encode_cursor,

)

def test_encode_decode_cursor_roundtrip_with_int_id():

created_at = datetime(2026, 1, 1, 12, 30, 0)

cursor = encode_cursor(created_at, 42, CursorDirection.DIRECTION_NEXT)

decoded_created_at, decoded_id, decoded_dir = decode_cursor(cursor)

assert decoded_created_at == created_at

assert decoded_id == 42

assert decoded_dir == CursorDirection.DIRECTION_NEXT

def test_decode_cursor_rejects_invalid_id():

cursor = encode_cursor(datetime.now(), 7, CursorDirection.DIRECTION_PREV)

assert decode_cursor(cursor)[1] == 7

def test_decode_cursor_rejects_garbage():

with pytest.raises(ValueError, match="Invalid cursor format"):

decode_cursor("not-a-cursor")