test(dbus): Add unit tests for PiControl D-Bus interface

Introduces initial tests for the PiControl interface in
`dbus_middleware1`. These tests cover basic functionality like checking
activity status and resetting the driver while verifying IOCTL calls.

tests/dbus_middleware1/process_image/__init__.py

@@ -0,0 +1,3 @@
+# -*- coding: utf-8 -*-
+# SPDX-FileCopyrightText: 2025 KUNBUS GmbH
+# SPDX-License-Identifier: GPL-2.0-or-later

tests/dbus_middleware1/process_image/test_interface_picontrol.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# SPDX-FileCopyrightText: 2025 KUNBUS GmbH
+# SPDX-License-Identifier: GPL-2.0-or-later
+from revpi_middleware.cli_commands.dbus_helper import BusType, simple_call
+from revpi_middleware.dbus_middleware1 import extend_interface
+from tests.dbus_middleware1.bus_provider import TestBusProvider
+from tests.dbus_middleware1.fake_devices import IOCTL_QUEUE
+
+
+class TestObjectPicontrol(TestBusProvider):
+
+    def test_is_active(self):
+        self.assertTrue(self.bp.running)
+
+    def test_reset_driver(self):
+        simple_call(
+            "ResetDriver",
+            interface=extend_interface("picontrol"),
+            bus_type=BusType.SESSION,
+        )
+        ioctl_call = IOCTL_QUEUE.get(timeout=2.0)
+        self.assertEqual((19212, 0), ioctl_call)