The test introduced in bb86141 turns out to be flaky in CI[1] with the following error message:
[03:40:43.047] stderr: [03:40:43.047] # Failed test 'connect : matches' [03:40:43.047] # at /tmp/cirrus-ci-build/src/test/postmaster/t/003_start_stop.pl line 78. [03:40:43.047] # 'psql: error: connection to server on socket "/tmp/X7O4HUuFUZ/.s.PGSQL.25995" failed: FATAL: role "invalid_user" does not exist' [03:40:43.047] # doesn't match '(?^:FATAL: sorry, too many clients already)' [03:40:43.047] # Looks like you failed 1 test of 25. [03:40:43.047] [03:40:43.047] (test program exited with status code 1) [1]: https://cirrus-ci.com/task/5571017969500160?logs=test_world#L256
