test: add initial structure for the common integration tests.

- Add bats common helpers.
- Add a first set of tests for some simple program.

tests/bats/lscpu.bats

@@ -0,0 +1,28 @@
+#!/usr/bin/env bats
+# apparmor.d - Full set of apparmor profiles
+# Copyright (C) 2024 Alexandre Pujol <alexandre@pujol.io>
+# SPDX-License-Identifier: GPL-2.0-only
+
+load common
+
+setup_file() {
+    aa_setup
+}
+
+# bats test_tags=lscpu
+@test "lscpu: Display information about all CPUs" {
+    lscpu
+    aa_check
+}
+
+# bats test_tags=lscpu
+@test "lscpu: Display information in a table" {
+    lscpu --extended
+    aa_check
+}
+
+# bats test_tags=lscpu
+@test "lscpu: Display only information about offline CPUs in a table" {
+    lscpu --extended --offline
+    aa_check
+}