tests: add more integration tests for core tools.

tests/bats/dfc.bats

@@ -0,0 +1,34 @@
+#!/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=dfc
+@test "dfc: Display filesystems and their disk usage in human-readable form with colors and graphs" {
+    dfc
+    aa_check
+}
+
+# bats test_tags=dfc
+@test "dfc: Display all filesystems including pseudo, duplicate and inaccessible filesystems" {
+    dfc -a
+    aa_check
+}
+
+# bats test_tags=dfc
+@test "dfc: Display filesystems without color" {
+    dfc -c never
+    aa_check
+}
+
+# bats test_tags=dfc
+@test "dfc: Display filesystems containing &#34;ext&#34; in the filesystem type" {
+    dfc -t ext
+    aa_check
+}