Parsed test spec with 2 sessions

starting permutation: insert1 insert2 c1 select2 c2
step insert1: INSERT INTO upsert(key, payload) VALUES('FooFoo', 'insert1') ON CONFLICT (lower(key)) DO UPDATE set key = EXCLUDED.key, payload = upsert.payload || ' updated by insert1';
step insert2: INSERT INTO upsert(key, payload) VALUES('FOOFOO', 'insert2') ON CONFLICT (lower(key)) DO UPDATE set key = EXCLUDED.key, payload = upsert.payload || ' updated by insert2'; <waiting ...>
step c1: COMMIT;
step insert2: <... completed>
step select2: SELECT * FROM upsert;
key   |payload                   
------+--------------------------
FOOFOO|insert1 updated by insert2
(1 row)

step c2: COMMIT;

starting permutation: insert1 insert2 a1 select2 c2
step insert1: INSERT INTO upsert(key, payload) VALUES('FooFoo', 'insert1') ON CONFLICT (lower(key)) DO UPDATE set key = EXCLUDED.key, payload = upsert.payload || ' updated by insert1';
step insert2: INSERT INTO upsert(key, payload) VALUES('FOOFOO', 'insert2') ON CONFLICT (lower(key)) DO UPDATE set key = EXCLUDED.key, payload = upsert.payload || ' updated by insert2'; <waiting ...>
step a1: ABORT;
step insert2: <... completed>
step select2: SELECT * FROM upsert;
key   |payload
------+-------
FOOFOO|insert2
(1 row)

step c2: COMMIT;