Parsed test spec with 2 sessions

starting permutation: w0_fetch w1_fetch w0_commit w1_commit
step w0_fetch: 
    SELECT (q.id % 2) AS partition, payload::text
    FROM ulak.queue q
    WHERE q.status = 'pending'
      AND (q.id % 2) = 0
    ORDER BY q.id
    LIMIT 4
    FOR UPDATE SKIP LOCKED;

partition|payload   
---------+----------
        0|{"seq": 2}
        0|{"seq": 4}
        0|{"seq": 6}
        0|{"seq": 8}
(4 rows)

step w1_fetch: 
    SELECT (q.id % 2) AS partition, payload::text
    FROM ulak.queue q
    WHERE q.status = 'pending'
      AND (q.id % 2) = 1
    ORDER BY q.id
    LIMIT 4
    FOR UPDATE SKIP LOCKED;

partition|payload   
---------+----------
        1|{"seq": 1}
        1|{"seq": 3}
        1|{"seq": 5}
        1|{"seq": 7}
(4 rows)

step w0_commit: COMMIT;
step w1_commit: COMMIT;

starting permutation: w1_fetch w0_fetch w1_commit w0_commit
step w1_fetch: 
    SELECT (q.id % 2) AS partition, payload::text
    FROM ulak.queue q
    WHERE q.status = 'pending'
      AND (q.id % 2) = 1
    ORDER BY q.id
    LIMIT 4
    FOR UPDATE SKIP LOCKED;

partition|payload   
---------+----------
        1|{"seq": 1}
        1|{"seq": 3}
        1|{"seq": 5}
        1|{"seq": 7}
(4 rows)

step w0_fetch: 
    SELECT (q.id % 2) AS partition, payload::text
    FROM ulak.queue q
    WHERE q.status = 'pending'
      AND (q.id % 2) = 0
    ORDER BY q.id
    LIMIT 4
    FOR UPDATE SKIP LOCKED;

partition|payload   
---------+----------
        0|{"seq": 2}
        0|{"seq": 4}
        0|{"seq": 6}
        0|{"seq": 8}
(4 rows)

step w1_commit: COMMIT;
step w0_commit: COMMIT;