Parsed test spec with 3 sessions

starting permutation: s2b s2txid s1init s3b s3txid s2c s2b s2insert s2p s3c s1insert s1start s2cp s1start
step s2b: BEGIN;
step s2txid: SELECT pg_current_xact_id() IS NULL;
?column?
--------
f       
(1 row)

step s1init: SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding', false, true); <waiting ...>
step s3b: BEGIN;
step s3txid: SELECT pg_current_xact_id() IS NULL;
?column?
--------
f       
(1 row)

step s2c: COMMIT;
step s2b: BEGIN;
step s2insert: INSERT INTO do_write DEFAULT VALUES;
step s2p: PREPARE TRANSACTION 'test1';
step s3c: COMMIT;
step s1init: <... completed>
?column?
--------
init    
(1 row)

step s1insert: INSERT INTO do_write DEFAULT VALUES;
step s1start: SELECT data  FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false', 'skip-empty-xacts', '1');
data                                        
--------------------------------------------
BEGIN                                       
table public.do_write: INSERT: id[integer]:2
COMMIT                                      
(3 rows)

step s2cp: COMMIT PREPARED 'test1';
step s1start: SELECT data  FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false', 'skip-empty-xacts', '1');
data                                        
--------------------------------------------
BEGIN                                       
table public.do_write: INSERT: id[integer]:1
PREPARE TRANSACTION 'test1'                 
COMMIT PREPARED 'test1'                     
(4 rows)

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