diff --git a/kuka_rsi_driver/test/move_sim.py b/kuka_rsi_driver/test/move_sim.py
index d567580..44c0da0 100644
--- a/kuka_rsi_driver/test/move_sim.py
+++ b/kuka_rsi_driver/test/move_sim.py
@@ -40,15 +40,13 @@
 
 from launch_testing.actions import ReadyToTest
 
-from controller_manager_msgs.srv import ListControllers
-
 from launch import LaunchDescription
 from launch.actions import IncludeLaunchDescription
 from launch.launch_description_sources import PythonLaunchDescriptionSource
 from launch.substitutions import PathJoinSubstitution
 
 sys.path.append(os.path.dirname(__file__))
-from test_interface import wait_for_service, call_service
+from test_interface import ControllerManagerInterface
 
 
 @pytest.mark.launch_test
@@ -113,6 +111,9 @@ def tearDownClass(cls):
         cls.node.destroy_node()
         rclpy.shutdown()
 
+    def setUp(self):
+        self.controller_manager_interface = ControllerManagerInterface(self.node)
+
     def test_controllers_loaded(self):
         expected_controllers_active = [
             "joint_state_broadcaster",
@@ -122,22 +123,11 @@ def test_controllers_loaded(self):
         ]
         expected_controllers_inactive = ["forward_position_controller"]
 
-        list_controllers_client = wait_for_service(
-            "controller_manager/list_controllers",
-            ListControllers,
-            self.node,
-            10,
-        )
-        self.assertIsNotNone(list_controllers_client)
-
         # Wait until all controllers are loaded
         for _ in range(5):
-            res = call_service(
-                list_controllers_client, ListControllers.Request(), self.node
-            )
-            self.assertIsNotNone(res)
+            controllers = self.controller_manager_interface.list_controllers()
 
-            if len(res.controller) == (
+            if len(controllers) == (
                 len(expected_controllers_active) + len(expected_controllers_inactive)
             ):
                 break
@@ -147,9 +137,9 @@ def test_controllers_loaded(self):
         # Verify controller activations
         for _ in range(5):
             # Check controllers
-            controllers_active = [c.name for c in res.controller if c.state == "active"]
+            controllers_active = [c.name for c in controllers if c.state == "active"]
             controllers_inactive = [
-                c.name for c in res.controller if c.state == "inactive"
+                c.name for c in controllers if c.state == "inactive"
             ]
 
             if (set(controllers_active) == set(expected_controllers_active)) and (
@@ -159,10 +149,7 @@ def test_controllers_loaded(self):
 
             # Spawners are not yet done, so wait and retry
             time.sleep(1)
-
-            res = _call_service(
-                self.node, list_controllers_client, ListControllers.Request()
-            )
+            controllers = self.controller_manager_interface.list_controllers()
 
         # Previous calls did not show controller activation success => Fail
         self.fail()
diff --git a/kuka_rsi_driver/test/test_interface.py b/kuka_rsi_driver/test/test_interface.py
index 19de702..fe37600 100644
--- a/kuka_rsi_driver/test/test_interface.py
+++ b/kuka_rsi_driver/test/test_interface.py
@@ -27,6 +27,37 @@
 # POSSIBILITY OF SUCH DAMAGE.
 import rclpy
 
+from controller_manager_msgs.srv import ListControllers
+
+
+class ControllerManagerInterface:
+    def __init__(self, node):
+        self._node = node
+        self._log = node.get_logger().get_child("controller_manager_interface")
+
+        self._list_controllers_client = wait_for_service(
+            "controller_manager/list_controllers", ListControllers, node, 10, self._log
+        )
+
+    def list_controllers(self):
+        res = call_service(
+            self._list_controllers_client,
+            ListControllers.Request(),
+            self._node,
+            self._log,
+        )
+
+        if len(res.controller) > 0:
+            self._log.info("Controllers:")
+            for controller in res.controller:
+                self._log.info(
+                    f"  - {controller.name} ({controller.type}) - {controller.state}"
+                )
+        else:
+            self._log.info("Controllers: []")
+
+        return res.controller
+
 
 def wait_for_service(srv_name, srv_type, node, timeout=10, log=None):
     if log is None:
@@ -36,10 +67,11 @@ def wait_for_service(srv_name, srv_type, node, timeout=10, log=None):
 
     log.info(f"Waiting for service '{srv_name}' (timeout: {timeout:.2f}s)...")
     if not client.wait_for_service(timeout):
-        log.error(
-            f"  Could not reach service '{srv_name}' within timeout {timeout:.2f}s"
+        error_msg = (
+            f"Could not reach service '{srv_name}' within timeout {timeout:.2f}s"
         )
-        return None
+        log.error(f"  {error_msg}")
+        raise RuntimeError(error_msg)
 
     log.info(f"  Successfully waited for service '{srv_name}'")
     return client
@@ -54,8 +86,9 @@ def call_service(client, request, node, log=None):
 
     rclpy.spin_until_future_complete(node, future)
     if future.result() is None:
-        log.error(f"  Could not call service '{client.srv_name}': {future.exception()}")
-        return None
+        error_msg = f"Could not call service '{client.srv_name}': {future.exception()}"
+        log.error(f"  {error_msg}")
+        raise RuntimeError(error_msg)
 
     log.info(f"  Received result: {future.result()}")
     return future.result()