diff --git a/lib/game/components/controlled_spaceship_ramp.dart b/lib/game/components/controlled_spaceship_ramp.dart
index 495f7a1f..6aa83371 100644
--- a/lib/game/components/controlled_spaceship_ramp.dart
+++ b/lib/game/components/controlled_spaceship_ramp.dart
@@ -54,15 +54,16 @@ class SpaceshipRampController
 
   int _hitsCounter = 0;
 
+  /// When a [Ball] shot the [SpaceshipRamp] it achieve improvements for the
+  /// current game, like multipliers or score.
   void shot() {
     _hitsCounter++;
 
     component._spaceshipRamp.progress();
 
-    // TODO(ruimiguel): Ramp shot
     gameRef.read<GameBloc>().add(const Scored(points: 5000));
 
-    // TODO(ruimiguel): increase score multiplier at GameBloc.
+    // TODO(ruimiguel): increase here multiplier at GameBloc.
 
     if (_hitsCounter % _oneMillionPointsTarget == 0) {
       // TODO(ruimiguel): One million by bonus??
@@ -78,8 +79,14 @@ class SpaceshipRampController
   }
 }
 
+/// Used to know when a [Ball] gets into the [SpaceshipRamp] against every ball
+/// that crosses the opening.
+@visibleForTesting
 enum SpaceshipRampSensorType {
+  /// Sensor at the entrance of the opening.
   door,
+
+  /// Sensor inside the [SpaceshipRamp].
   inside,
 }
 
@@ -87,6 +94,7 @@ enum SpaceshipRampSensorType {
 /// Small sensor body used to detect when a ball has entered the
 /// [SpaceshipRamp].
 /// {@endtemplate}
+@visibleForTesting
 class SpaceshipRampSensor extends BodyComponent with InitialPosition, Layered {
   /// {@macro spaceship_ramp_sensor}
   SpaceshipRampSensor({required this.type}) : super() {
@@ -94,6 +102,7 @@ class SpaceshipRampSensor extends BodyComponent with InitialPosition, Layered {
     renderBody = false;
   }
 
+  /// Type for the sensor, to know if it's the one at the door or inside ramp.
   final SpaceshipRampSensorType type;
 
   @override
diff --git a/packages/pinball_components/lib/src/components/spaceship_ramp.dart b/packages/pinball_components/lib/src/components/spaceship_ramp.dart
index 30211251..f8cee7ac 100644
--- a/packages/pinball_components/lib/src/components/spaceship_ramp.dart
+++ b/packages/pinball_components/lib/src/components/spaceship_ramp.dart
@@ -34,7 +34,7 @@ class SpaceshipRamp extends Blueprint {
             _SpaceshipRampForegroundRailing(),
             _SpaceshipRampBase()..initialPosition = Vector2(1.7, -20),
             _SpaceshipRampBackgroundRailingSpriteComponent(),
-            _SpaceshipRampArrowSpriteComponent(),
+            SpaceshipRampArrowSpriteComponent(),
           ],
         );
 
@@ -42,7 +42,7 @@ class SpaceshipRamp extends Blueprint {
   ///
   /// If the current state is the last one it cycles back to the initial state.
   void progress() => components
-      .whereType<_SpaceshipRampArrowSpriteComponent>()
+      .whereType<SpaceshipRampArrowSpriteComponent>()
       .first
       .progress();
 }
@@ -203,11 +203,12 @@ class _SpaceshipRampBackgroundRampSpriteComponent extends SpriteComponent
 ///
 /// Lights progressively whenever a [Ball] gets into [SpaceshipRamp].
 /// {@endtemplate}
-class _SpaceshipRampArrowSpriteComponent
+@visibleForTesting
+class SpaceshipRampArrowSpriteComponent
     extends SpriteGroupComponent<SpaceshipRampArrowSpriteState>
     with HasGameRef {
   /// {@macro spaceship_ramp_arrow_sprite_component}
-  _SpaceshipRampArrowSpriteComponent()
+  SpaceshipRampArrowSpriteComponent()
       : super(
           anchor: Anchor.center,
           position: Vector2(-3.9, -56.5),
diff --git a/test/game/components/controlled_spaceship_ramp_test.dart b/test/game/components/controlled_spaceship_ramp_test.dart
index 03f2baba..e35c570b 100644
--- a/test/game/components/controlled_spaceship_ramp_test.dart
+++ b/test/game/components/controlled_spaceship_ramp_test.dart
@@ -1,6 +1,7 @@
 // ignore_for_file: cascade_invocations
 
 import 'package:bloc_test/bloc_test.dart';
+import 'package:flame/components.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -39,7 +40,7 @@ void main() {
 
     group('loads', () {
       flameTester.test(
-        'a SpaceshipRamp',
+        'four SpriteComponent (two rails, main and opening)',
         (game) async {
           final controlledSpaceshipRamp = ControlledSpaceshipRamp();
           await game.ensureAdd(controlledSpaceshipRamp);
@@ -47,7 +48,23 @@ void main() {
           expect(
             controlledSpaceshipRamp
                 .descendants()
-                .whereType<SpaceshipRamp>()
+                .whereType<SpriteComponent>()
+                .length,
+            equals(4),
+          );
+        },
+      );
+
+      flameTester.test(
+        'a SpaceshipRampArrowSpriteComponent',
+        (game) async {
+          final controlledSpaceshipRamp = ControlledSpaceshipRamp();
+          await game.ensureAdd(controlledSpaceshipRamp);
+
+          expect(
+            controlledSpaceshipRamp
+                .descendants()
+                .whereType<SpaceshipRampArrowSpriteComponent>()
                 .length,
             equals(1),
           );