Parsed test spec with 2 sessions

starting permutation: s1b s1w s2init s1c s2start s1b s1w s1c s2start s1b s1w s2start s1c s2start
step s1b: BEGIN ISOLATION LEVEL SERIALIZABLE;
step s1w: INSERT INTO do_write DEFAULT VALUES;
step s2init: SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding'); <waiting ...>
step s1c: COMMIT;
step s2init: <... completed>
?column?
--------
init    
(1 row)

step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
data
----
(0 rows)

step s1b: BEGIN ISOLATION LEVEL SERIALIZABLE;
step s1w: INSERT INTO do_write DEFAULT VALUES;
step s1c: COMMIT;
step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
data                                        
--------------------------------------------
BEGIN                                       
table public.do_write: INSERT: id[integer]:2
COMMIT                                      
(3 rows)

step s1b: BEGIN ISOLATION LEVEL SERIALIZABLE;
step s1w: INSERT INTO do_write DEFAULT VALUES;
step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
data
----
(0 rows)

step s1c: COMMIT;
step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
data                                        
--------------------------------------------
BEGIN                                       
table public.do_write: INSERT: id[integer]:3
COMMIT                                      
(3 rows)

?column?
--------
stop    
(1 row)