feat: tested and made classes private

lib/game/components/google_word.dart

@@ -4,7 +4,6 @@ import 'dart:async';
 
 import 'package:flame/components.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
-import 'package:flutter/material.dart';
 import 'package:pinball/flame/flame.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
@@ -26,6 +25,7 @@ class GoogleWord extends Component
   @override
   Future<void> onLoad() async {
     await super.onLoad();
+    gameRef.addContactCallback(_GoogleLetterBallContactCallback());
 
     final offsets = [
       Vector2(-12.92, -1.82),
@@ -73,11 +73,10 @@ class _GoogleWordController extends ComponentController<GoogleWord>
 }
 
 /// Activates a [GoogleLetter] when it contacts with a [Ball].
-@visibleForTesting
-class BonusLetterBallContactCallback
-    extends ContactCallback<Ball, GoogleLetter> {
+class _GoogleLetterBallContactCallback
+    extends ContactCallback<GoogleLetter, Ball> {
   @override
-  void begin(Ball ball, GoogleLetter googleLetter, Contact contact) {
+  void begin(GoogleLetter googleLetter, _, __) {
     (googleLetter.parent! as GoogleWord)
         .controller
         .activate(googleLetter.index);

lib/game/pinball_game.dart

@@ -72,7 +72,6 @@ class PinballGame extends Forge2DGame
   void _addContactCallbacks() {
     addContactCallback(BallScorePointsCallback(this));
     addContactCallback(BottomWallBallContactCallback());
-    addContactCallback(BonusLetterBallContactCallback());
   }
 
   Future<void> _addGameBoundaries() async {

test/game/components/google_word_test.dart

@@ -1,8 +1,13 @@
 // ignore_for_file: cascade_invocations
 
+import 'dart:math';
+
+import 'package:bloc_test/bloc_test.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_test/flame_test.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:mockingjay/mockingjay.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
 
@@ -10,26 +15,65 @@ import '../../helpers/helpers.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  final flameTester = FlameTester(EmptyPinballGameTest.new);
 
   group('GoogleWord', () {
-    const googleWord = 'Google';
+    late GameBloc gameBloc;
+
+    setUp(() {
+      gameBloc = MockGameBloc();
+      whenListen(
+        gameBloc,
+        const Stream<GameState>.empty(),
+        initialState: const GameState.initial(),
+      );
+    });
+
+    final flameTester = FlameTester(EmptyPinballGameTest.new);
+    final flameBlocTester = FlameBlocTester<PinballGame, GameBloc>(
+      gameBuilder: EmptyPinballGameTest.new,
+      blocBuilder: () => gameBloc,
+    );
 
     flameTester.test(
       'loads the letters correctly',
       (game) async {
-        final bonusWord = GoogleWord(
-          position: Vector2.zero(),
-        );
-        await game.ensureAdd(bonusWord);
+        const word = 'Google';
+        final googleWord = GoogleWord(position: Vector2.zero());
+        await game.ensureAdd(googleWord);
 
-        final letters = bonusWord.children.whereType<GoogleLetter>();
-        expect(letters.length, equals(googleWord.length));
+        final letters = googleWord.children.whereType<GoogleLetter>();
+        expect(letters.length, equals(word.length));
 
-        for (var index = 0; index < googleWord.length; index++) {
+        for (var index = 0; index < word.length; index++) {
           expect(letters.elementAt(index).index, equals(index));
         }
       },
     );
+
+    flameBlocTester.testGameWidget(
+      'adds GameBonus.word to the game when all letters are activated',
+      setUp: (game, _) async {
+        final ball = Ball(baseColor: const Color(0xFFFF0000));
+        final googleWord = GoogleWord(position: Vector2.zero());
+        await game.ensureAddAll([googleWord, ball]);
+
+        final letters = googleWord.children.whereType<GoogleLetter>();
+        expect(letters, isNotEmpty);
+        for (final letter in letters) {
+          beginContact(game, letter, ball);
+          await game.ready();
+
+          if (letter == letters.last) {
+            verify(
+              () => gameBloc.add(const BonusActivated(GameBonus.word)),
+            ).called(1);
+          } else {
+            verifyNever(
+              () => gameBloc.add(const BonusActivated(GameBonus.word)),
+            );
+          }
+        }
+      },
+    );
   });
 }