test: move TEST-11-ISSUE-3166 setup to static files

test/units/testsuite-11.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=TEST-11-ISSUE-3166
+
+[Service]
+ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
+Type=oneshot

test/units/testsuite-11.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -x
+
+systemctl start fail-on-restart.service
+active_state=$(systemctl show --value --property ActiveState fail-on-restart.service)
+while [[ "$active_state" == "activating" || "$active_state" == "active" ]]; do
+    sleep 1
+    active_state=$(systemctl show --value --property ActiveState fail-on-restart.service)
+done
+systemctl is-failed fail-on-restart.service || exit 1
+touch /testok