-test "$(id -u)" = "0" || exit $EXIT_SKIP_TEST
-test -e /dev/net/tun || exit $EXIT_SKIP_TEST
-ip netns list || exit $EXIT_SKIP_TEST
-command -v socat || exit $EXIT_SKIP_TEST
+require_root "$0" "$@"
+test -e /dev/net/tun || exit "$EXIT_SKIP_TEST"
+ip netns list || exit "$EXIT_SKIP_TEST"
+command -v socat || exit "$EXIT_SKIP_TEST"