Parsed test spec with 2 sessions

starting permutation: rwx1 c1 rwx2 c2
step rwx1: UPDATE test SET t = 'apple' WHERE t = 'pear';
step c1: COMMIT;
step rwx2: UPDATE test SET t = 'pear' WHERE t = 'apple'
step c2: COMMIT;

starting permutation: rwx1 rwx2 c1 c2
step rwx1: UPDATE test SET t = 'apple' WHERE t = 'pear';
step rwx2: UPDATE test SET t = 'pear' WHERE t = 'apple'
step c1: COMMIT;
step c2: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rwx1 rwx2 c2 c1
step rwx1: UPDATE test SET t = 'apple' WHERE t = 'pear';
step rwx2: UPDATE test SET t = 'pear' WHERE t = 'apple'
step c2: COMMIT;
step c1: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rwx2 rwx1 c1 c2
step rwx2: UPDATE test SET t = 'pear' WHERE t = 'apple'
step rwx1: UPDATE test SET t = 'apple' WHERE t = 'pear';
step c1: COMMIT;
step c2: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rwx2 rwx1 c2 c1
step rwx2: UPDATE test SET t = 'pear' WHERE t = 'apple'
step rwx1: UPDATE test SET t = 'apple' WHERE t = 'pear';
step c2: COMMIT;
step c1: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rwx2 c2 rwx1 c1
step rwx2: UPDATE test SET t = 'pear' WHERE t = 'apple'
step c2: COMMIT;
step rwx1: UPDATE test SET t = 'apple' WHERE t = 'pear';
step c1: COMMIT;