feat: multipliers behavior with multiplier from gamebloc

lib/game/components/multipliers/behaviors/multipliers_behavior.dart

@@ -10,16 +10,17 @@ class MultipliersBehavior extends Component
   void onMount() {
     super.onMount();
 
-    // TODO(ruimiguel): filter only when multiplier has change, not every other
-    // state.
+    var previousMultiplier = 1;
+
+    // TODO(ruimiguel): filter only when multiplier has change.
     gameRef.read<GameBloc>().stream.listen((state) {
+      if (state.multiplier != previousMultiplier) {
+        previousMultiplier = state.multiplier;
+
         final multipliers = parent.children.whereType<Multiplier>();
         for (final multiplier in multipliers) {
-        // TODO(ruimiguel): use here GameState.multiplier when merged
-        // https://github.com/VGVentures/pinball/pull/213.
-        final currentMultiplier = state.score.bitLength % 6 + 1;
-
-        multiplier.bloc.toggle(currentMultiplier);
+          multiplier.bloc.toggle(state.multiplier);
+        }
       }
     });
   }

test/game/components/multipliers/behaviors/multipliers_behavior_test.dart

@@ -49,10 +49,24 @@ void main() {
     flameBlocTester.testGameWidget(
       'calls toggle once per each multiplier when GameBloc emit state',
       setUp: (game, tester) async {
+        final multiplierCubit = MockMultiplierCubit();
         final behavior = MultipliersBehavior();
         final parent = Multipliers.test();
-        final multiplier = MockMultiplier();
-        final multipliers = [multiplier];
+        final multipliers = [
+          Multiplier.test(
+            value: MultiplierValue.x2,
+            bloc: multiplierCubit,
+          ),
+        ];
+
+        whenListen(
+          multiplierCubit,
+          const Stream<MultiplierState>.empty(),
+          initialState: MultiplierState(
+            value: MultiplierValue.x2,
+            spriteState: MultiplierSpriteState.dimmed,
+          ),
+        );
 
         final streamController = StreamController<GameState>();
         whenListen(
@@ -60,18 +74,13 @@ void main() {
           streamController.stream,
           initialState: GameState.initial(),
         );
-        when(() => multiplier.addToParent(any()))
-            .thenAnswer((_) async => () {});
 
         await parent.addAll(multipliers);
         await game.ensureAdd(parent);
         await parent.ensureAdd(behavior);
 
-        await tester.pump();
-
-        streamController.add(GameState.initial().copyWith(score: 100));
+        streamController.add(GameState.initial().copyWith(multiplier: 2));
 
-        await game.ready();
         await tester.pump();
 
         for (final multiplier in multipliers) {

test/helpers/mocks.dart

@@ -91,3 +91,5 @@ class MockSparkyBumper extends Mock implements SparkyBumper {}
 class MockMultiplier extends Mock implements Multiplier {}
 
 class MockMultipliersGroup extends Mock implements Multipliers {}
+
+class MockMultiplierCubit extends Mock implements MultiplierCubit {}