refactor: used EmptyPinballGame

lib/game/pinball_game.dart

@@ -19,8 +19,6 @@ class PinballGame extends Forge2DGame
 
   final PinballTheme theme;
 
-  late final Plunger plunger;
-
   @override
   void onAttach() {
     super.onAttach();
@@ -75,7 +73,7 @@ class PinballGame extends Forge2DGame
   }
 
   Future<void> _addPlunger() async {
-    plunger = Plunger(compressionDistance: 29)
+    final plunger = Plunger(compressionDistance: 29)
       ..initialPosition =
           BoardDimensions.bounds.center.toVector2() + Vector2(41.5, -49);
     await add(plunger);
@@ -98,6 +96,10 @@ class PinballGame extends Forge2DGame
   }
 
   void spawnBall() {
+    // TODO(alestiago): Remove once this logic is moved to controller.
+    final plunger = firstChild<Plunger>();
+    if (plunger == null) return;
+
     final ball = ControlledBall.launch(
       theme: theme,
     )..initialPosition = Vector2(

test/game/components/flutter_forest_test.dart

@@ -25,7 +25,7 @@ void beginContact(Forge2DGame game, BodyComponent bodyA, BodyComponent bodyB) {
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  final flameTester = FlameTester(PinballGameTest.create);
+  final flameTester = FlameTester(EmptyPinballGame.create);
 
   group('FlutterForest', () {
     flameTester.test(
@@ -146,16 +146,15 @@ void main() {
       });
 
       final flameBlocTester = FlameBlocTester<PinballGame, GameBloc>(
-        gameBuilder: PinballGameTest.create,
+        gameBuilder: EmptyPinballGame.create,
         blocBuilder: () => gameBloc,
       );
 
       flameBlocTester.testGameWidget(
         'add DashNestActivated event',
         setUp: (game, tester) async {
-          await game.ready();
+          final flutterForest = FlutterForest();
-          final flutterForest =
+          await game.ensureAdd(flutterForest);
-              game.descendants().whereType<FlutterForest>().first;
           await game.ensureAdd(ball);
 
           final bumpers =
@@ -177,15 +176,16 @@ void main() {
           final flutterForest = FlutterForest();
           await game.ensureAdd(flutterForest);
           await game.ensureAdd(ball);
+          game.addContactCallback(BallScorePointsCallback(game));
 
-          final bumpers =
+          final bumpers = flutterForest.descendants().whereType<ScorePoints>();
-              flutterForest.descendants().whereType<DashNestBumper>();
 
           for (final bumper in bumpers) {
             beginContact(game, bumper, ball);
-            final points = (bumper as ScorePoints).points;
             verify(
-              () => gameBloc.add(Scored(points: points)),
+              () => gameBloc.add(
+                Scored(points: bumper.points),
+              ),
             ).called(1);
           }
         },

test/helpers/extensions.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/services.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_theme/pinball_theme.dart';
 
@@ -20,3 +21,16 @@ extension DebugPinballGameTest on DebugPinballGame {
         ),
       );
 }
+
+class EmptyPinballGame extends PinballGame {
+  EmptyPinballGame({required PinballTheme theme}) : super(theme: theme);
+
+  @override
+  Future<void> onLoad() async {}
+
+  static PinballGame create() => EmptyPinballGame(
+        theme: const PinballTheme(
+          characterTheme: DashTheme(),
+        ),
+      );
+}