In the past people have tried to ensure that the isolation tests would pass regardless of the prevailing default_transaction_isolation setting. (That was sort of the point, in fact, for the earliest tests using that infrastructure.)
This seems to have been forgotten about lately, as all of these tests fail with default_transaction_isolation = serializable: test detach-partition-concurrently-1 ... FAILED 504 ms test detach-partition-concurrently-3 ... FAILED 2224 ms test detach-partition-concurrently-4 ... FAILED 1600 ms test fk-partitioned-2 ... FAILED 133 ms test lock-update-delete ... FAILED 538 ms test tuplelock-update ... FAILED 10223 ms test tuplelock-upgrade-no-deadlock ... FAILED 664 ms test tuplelock-partition ... FAILED 49 ms (drop-index-concurrently-1 also failed until just now, but I resurrected its variant expected-file.) So: * Do we still care about that policy? * If so, who's going to fix the above-listed problems? * Should we try to get some routine testing of this case in place? regards, tom lane