Add testcase to check power-mode before and after suspend

providers/base/units/suspend/suspend.pxu

@@ -48,6 +48,16 @@ estimated_duration: 1.2
 _summary: Dumps memory info to a file for comparison after suspend
 command: meminfo_resource.py > "$PLAINBOX_SESSION_SHARE"/meminfo_before_suspend
 
+plugin: shell
+category_id: com.canonical.plainbox::suspend
+id: suspend/power_mode_before_suspend
+estimated_duration: 1.2
+requires:
+  module.name == 'platform_profile'
+  package.name == 'power-profiles-daemon'
+_summary: Dumps power_mode info to a file for comparison after suspend
+command: power_mode_resource.py > "$PLAINBOX_SESSION_SHARE"/power_mode_before_suspend
+
 unit: template
 template-resource: device
 template-filter: device.category == 'NETWORK'
@@ -583,6 +593,30 @@ _description:
  Verify that all memory is available after resuming from suspend.
 command: meminfo_resource.py | diff "$PLAINBOX_SESSION_SHARE"/meminfo_before_suspend -
 
+plugin: shell
+category_id: com.canonical.plainbox::suspend
+id: suspend/power_mode_after_suspend
+estimated_duration: 1.2
+requires:
+  module.name == 'platform_profile'
+  package.name == 'power-profiles-daemon'
+depends: suspend/suspend_advanced_auto suspend/power_mode_before_suspend
+_description:
+ Verify that power mode is changed after resuming from suspend.
+command: power_mode_resource.py | diff "$PLAINBOX_SESSION_SHARE"/power_mode_before_suspend -
+
+plugin: shell
+category_id: com.canonical.plainbox::suspend
+id: suspend/power_mode_after_suspend_auto
+estimated_duration: 1.2
+requires:
+  module.name == 'platform_profile'
+  package.name == 'power-profiles-daemon'
+depends: suspend/suspend_advanced_auto suspend/power_mode_before_suspend
+_description:
+ Verify that power mode is changed after resuming from suspend.
+command: power_mode_resource.py | diff "$PLAINBOX_SESSION_SHARE"/power_mode_before_suspend -
+
 plugin: manual
 category_id: com.canonical.plainbox::suspend
 id: suspend/display_after_suspend

providers/resource/bin/power_mode_resource.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+#
+# This file is part of Checkbox.
+#
+# Copyright 2023 Canonical Ltd.
+#
+# Checkbox is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3,
+# as published by the Free Software Foundation.
+
+#
+# Checkbox is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Checkbox.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""Modules providing a function running os or sys commands."""
+import sys
+import os
+
+
+def main():
+    """Dump the power mode."""
+    sysfs_root = "/sys/firmware/acpi/"
+    if not os.path.isdir(sysfs_root):
+        return 1
+
+    profile_filename = os.path.join(sysfs_root, "platform_profile")
+    if (not os.path.isfile(profile_filename) or
+            not os.access(profile_filename, os.R_OK)):
+        return 1
+
+    with open(profile_filename, "rt", encoding="utf-8") as stream:
+        profile = stream.read().strip().split()
+        if len(profile) < 1:
+            return 1
+        else:
+            print(profile[0])
+            # uncomment the following line to do local testing
+            #os.system(f"powerprofilesctl set power-saver")
+            return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())