refactor: multiball blink

lib/game/components/multiballs/behaviors/multiballs_behavior.dart

@@ -12,9 +12,11 @@ class MultiballsBehavior extends Component
         BlocComponent<GameBloc, GameState> {
   @override
   bool listenWhen(GameState? previousState, GameState newState) {
-    final hasMultiball = newState.bonusHistory.contains(GameBonus.dashNest);
     final hasChanged = previousState?.bonusHistory != newState.bonusHistory;
-    return hasChanged && hasMultiball;
+    final lastBonusIsMultiball = newState.bonusHistory.isNotEmpty &&
+        newState.bonusHistory.last == GameBonus.dashNest;
+
+    return hasChanged && lastBonusIsMultiball;
   }
 
   @override

packages/pinball_components/lib/src/components/multiball/behaviors/multiball_blinking_behavior.dart

@@ -21,7 +21,6 @@ class MultiballBlinkingBehavior extends Component with ParentIsA<Multiball> {
     }
   }
 
-  // TODO(ruimiguel): try to improve with TimerComponent?
   Future<void> _animate() async {
     if (!_isAnimating) {
       _isAnimating = true;

test/game/components/multiballs/behaviors/multiballs_behavior_test.dart

@@ -55,9 +55,10 @@ void main() {
       test(
           'is false when the bonusHistory has changed '
           'with a bonus different than GameBonus.dashNest', () {
-        final previous = GameState.initial();
+        final previous =
+            GameState.initial().copyWith(bonusHistory: [GameBonus.dashNest]);
         final state = previous.copyWith(
-          bonusHistory: [GameBonus.androidSpaceship],
+          bonusHistory: [...previous.bonusHistory, GameBonus.androidSpaceship],
         );
 
         expect(
@@ -67,6 +68,7 @@ void main() {
       });
 
       test('is false when the bonusHistory state is the same', () {
+        final previous = GameState.initial();
         final state = GameState(
           score: 10,
           multiplier: 1,
@@ -74,7 +76,6 @@ void main() {
           bonusHistory: const [],
         );
 
-        final previous = GameState.initial();
         expect(
           MultiballsBehavior().listenWhen(previous, state),
           isFalse,