Parsed test spec with 2 sessions

starting permutation: ins com upd
step ins: INSERT INTO bar VALUES (42);
step com: COMMIT;
step upd: UPDATE foo SET b = 'Hello World';

starting permutation: ins upd com
step ins: INSERT INTO bar VALUES (42);
step upd: UPDATE foo SET b = 'Hello World'; <waiting ...>
step com: COMMIT;
step upd: <... completed>

starting permutation: upd ins com
step upd: UPDATE foo SET b = 'Hello World';
step ins: INSERT INTO bar VALUES (42);
step com: COMMIT;
