feat: included GoogleLetter.test

packages/pinball_components/lib/src/components/google_letter/google_letter.dart

@@ -1,5 +1,6 @@
 import 'package:flame/components.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:flutter/material.dart';
 import 'package:pinball_components/pinball_components.dart';
 import 'package:pinball_components/src/components/google_letter/behaviors/behaviors.dart';
 import 'package:pinball_flame/pinball_flame.dart';
@@ -12,9 +13,8 @@ export 'cubit/google_letter_cubit.dart';
 class GoogleLetter extends BodyComponent with InitialPosition {
   /// {@macro google_letter}
   GoogleLetter(
-    int index, {
+    int index,
-    GoogleLetterCubit? bloc,
+  )   : bloc = GoogleLetterCubit(),
-  })  : bloc = bloc ?? GoogleLetterCubit(),
         super(
           children: [
             GoogleLetterBallContactBehavior(),
@@ -22,6 +22,16 @@ class GoogleLetter extends BodyComponent with InitialPosition {
           ],
         );
 
+  /// Creates an [GoogleLetter] without any children.
+  ///
+  /// This can be used for testing [GoogleLetter]'s behaviors in isolation.
+  // TODO(alestiago): Refactor injecting bloc once the following is merged:
+  // https://github.com/flame-engine/flame/pull/1538
+  @visibleForTesting
+  GoogleLetter.test({
+    required this.bloc,
+  });
+
   // TODO(alestiago): Consider refactoring once the following is merged:
   // https://github.com/flame-engine/flame/pull/1538
   // ignore: public_member_api_docs

packages/pinball_components/test/src/components/google_letter/behaviors/google_letter_ball_contact_behavior_test.dart

@@ -36,7 +36,7 @@ void main() {
               initialState: GoogleLetterState.active,
             );
 
-            final googleLetter = GoogleLetter(0, bloc: bloc);
+            final googleLetter = GoogleLetter.test(bloc: bloc);
             await googleLetter.add(behavior);
             await game.ensureAdd(googleLetter);
 

packages/pinball_components/test/src/components/google_letter/google_letter_test.dart

@@ -96,7 +96,7 @@ void main() {
         initialState: GoogleLetterState.active,
       );
       when(bloc.close).thenAnswer((_) async {});
-      final googleLetter = GoogleLetter(0, bloc: bloc);
+      final googleLetter = GoogleLetter.test(bloc: bloc);
 
       await game.ensureAdd(googleLetter);
       game.remove(googleLetter);