tests: add a few integration tests.

tests/integration/pacman/paccache.bats

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+#!/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
+
+@test "paccache: Perform a dry-run and show the number of candidate packages for deletion" {
+    sudo paccache -d
+}
+
+@test "paccache: Move candidate packages to a directory instead of deleting them" {
+    sudo paccache -m "$USER_BUILD_DIRS"
+}
+
+@test "paccache: Remove all but the 3 most recent package versions from the `pacman` cache" {
+    sudo paccache -r
+}
+
+@test "paccache: Set the number of package versions to keep" {
+    sudo paccache -rk 3
+}

tests/integration/pacman/pacman-key.bats

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+#!/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
+
+@test "pacman-key: Initialize the 'pacman' keyring" {
+    sudo pacman-key --init
+}
+
+@test "pacman-key: Add the default Arch Linux keys" {
+    sudo pacman-key --populate
+}
+
+@test "pacman-key: List keys from the public keyring" {
+    pacman-key --list-keys
+}
+
+@test "pacman-key: Receive a key from a key server" {
+    sudo pacman-key --recv-keys 06A26D531D56C42D66805049C5469996F0DF68EC
+}
+
+@test "pacman-key: Print the fingerprint of a specific key" {
+    pacman-key --finger 06A26D531D56C42D66805049C5469996F0DF68EC
+}
+
+@test "pacman-key: Sign an imported key locally" {
+    sudo pacman-key --lsign-key 06A26D531D56C42D66805049C5469996F0DF68EC
+}
+
+@test "pacman-key: Remove a specific key" {
+    sudo pacman-key --delete 06A26D531D56C42D66805049C5469996F0DF68EC
+}

tests/integration/pacman/pacman.bats

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+#!/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
+
+@test "pacman: Synchronize and update all packages" {
+    sudo pacman -Syu --noconfirm
+}
+
+@test "pacman: Install a new package" {
+    sudo pacman -S --noconfirm pass pass-otp
+}
+
+@test "pacman: Remove a package and its dependencies" {
+    sudo pacman -Rs --noconfirm pass-otp
+}
+
+@test "pacman: List installed packages and versions" {
+    pacman -Q
+}
+
+@test "pacman: List only the explicitly installed packages and versions" {
+    pacman -Qe
+}
+
+@test "pacman: List orphan packages (installed as dependencies but not actually required by any package)" {
+    pacman -Qtdq
+}
+
+@test "pacman: Empty the entire 'pacman' cache" {
+    sudo pacman -Scc --noconfirm
+}