tests: add a few integration tests.

tests/integration/systemd/localectl.bats

@@ -0,0 +1,23 @@
+#!/usr/bin/env bats
+# apparmor.d - Full set of apparmor profiles
+# Copyright (C) 2025 Alexandre Pujol <alexandre@pujol.io>
+# SPDX-License-Identifier: GPL-2.0-only
+
+load ../common
+
+@test "localectl: Show the current settings of the system locale and keyboard mapping" {
+    localectl
+}
+
+@test "localectl: List available locales" {
+    localectl list-locales
+}
+
+@test "localectl: Set a system locale variable" {
+    sudo localectl set-locale LANG=en_US.UTF-8
+}
+
+@test "localectl: Set the system keyboard mapping for the console and X11" {
+    sudo localectl set-keymap uk
+}
+