test: move TEST-37-RUNTIMEDIRECTORYPRESERVE setup to static files

test/units/testsuite-37.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=TEST-37-RUNTIMEDIRECTORYPRESERVE
+
+[Service]
+ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
+Type=oneshot

test/units/testsuite-37.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+set -ex
+set -o pipefail
+
+systemd-mount -p RuntimeDirectory=hoge -p RuntimeDirectoryPreserve=yes -t tmpfs tmpfs /tmp/aaa
+
+touch /run/hoge/foo
+touch /tmp/aaa/bbb
+
+systemctl restart tmp-aaa.mount
+
+test -e /run/hoge/foo
+! test -e /tmp/aaa/bbb
+
+echo OK > /testok
+
+exit 0