BEGIN;
SET LOCAL client_min_messages = WARNING;
CREATE EXTENSION IF NOT EXISTS pg_curl;
END;
BEGIN;
select curl_easy_reset();
 curl_easy_reset 
-----------------
 t
(1 row)

-- exact RFC 3986 percent-encoding (space -> %20, not +)
select curl_easy_escape('a b/c?d=e&f%g');
     curl_easy_escape      
---------------------------
 a%20b%2Fc%3Fd%3De%26f%25g
(1 row)

select curl_easy_unescape('a%20b%2Fc%3Fd%3De%26f%25g');
 curl_easy_unescape 
--------------------
 a b/c?d=e&f%g
(1 row)

-- unreserved characters (ALPHA / DIGIT / "-" / "." / "_" / "~") are left untouched
select curl_easy_escape('abcXYZ019-._~') = 'abcXYZ019-._~' as unreserved_untouched;
 unreserved_untouched 
----------------------
 t
(1 row)

-- round-trip, including multi-byte UTF-8 input
select curl_easy_unescape(curl_easy_escape('a b/c?d=e&f%g россия')) = 'a b/c?d=e&f%g россия' as round_trip_ok;
 round_trip_ok 
---------------
 t
(1 row)

END;