test: check pam warning message

src/shared/pam-util.c

@@ -95,6 +95,7 @@ static void pam_bus_data_destroy(pam_handle_t *handle, void *data, int error_sta
         PamBusData *d = data;
         if (FLAGS_SET(error_status, PAM_DATA_SILENT) &&
             d->bus && bus_origin_changed(d->bus))
+                /* Please adjust test/units/end.sh when updating the log message. */
                 pam_syslog(handle, LOG_DEBUG, "Attempted to close sd-bus after fork whose connection is opened before the fork, this should not happen.");
 
         pam_bus_data_free(data);

test/units/end.sh

@@ -6,5 +6,8 @@ set -o pipefail
 
 (! journalctl -q -o short-monotonic --grep "didn't pass validation" >>/failed)
 
+# Here, the redundant '[.]' at the end is for making not the logged self command hit the grep.
+(! journalctl -q -o short-monotonic --grep 'Attempted to close sd-bus after fork whose connection is opened before the fork, this should not happen[.]' >>/failed)
+
 systemctl poweroff --no-block
 exit 0