refactor: add drain behavior

lib/game/components/components.dart

@@ -5,6 +5,7 @@ export 'controlled_ball.dart';
 export 'controlled_flipper.dart';
 export 'controlled_plunger.dart';
 export 'dino_desert.dart';
+export 'drain.dart';
 export 'flutter_forest/flutter_forest.dart';
 export 'game_flow_controller.dart';
 export 'google_word/google_word.dart';

lib/game/components/drain.dart

@@ -1,15 +1,15 @@
 import 'package:flame/extensions.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
 
 /// {@template drain}
 /// Area located at the bottom of the board to detect when a [Ball] is lost.
 /// {@endtemplate}
-class Drain extends BodyComponent {
+// TODO(allisonryan0002): move to components package when possible.
+class Drain extends BodyComponent with ContactCallbacks {
   /// {@macro drain}
-  Drain() {
-    renderBody = false;
-  }
+  Drain() : super(renderBody: false);
 
   @override
   Body createBody() {
@@ -23,4 +23,12 @@ class Drain extends BodyComponent {
 
     return world.createBody(bodyDef)..createFixture(fixtureDef);
   }
+
+// TODO(allisonryan0002): move this to ball.dart when BallLost is removed.
+  @override
+  void beginContact(Object other, Contact contact) {
+    super.beginContact(other, contact);
+    if (other is! ControlledBall) return;
+    other.controller.lost();
+  }
 }

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

@@ -10,7 +10,6 @@ export 'chrome_dino.dart';
 export 'dash_animatronic.dart';
 export 'dash_nest_bumper/dash_nest_bumper.dart';
 export 'dino_walls.dart';
-export 'drain.dart';
 export 'fire_effect.dart';
 export 'flipper.dart';
 export 'google_letter/google_letter.dart';

test/game/components/bottom_group_test.dart

@@ -16,7 +16,9 @@ void main() {
     Assets.images.flipper.left.keyName,
     Assets.images.flipper.right.keyName,
   ];
-  final flameTester = FlameTester(() => EmptyPinballTestGame(assets));
+  final flameTester = FlameTester(
+    () => EmptyPinballTestGame(assets: assets),
+  );
 
   group('BottomGroup', () {
     flameTester.test(

test/game/components/controlled_ball_test.dart

@@ -66,21 +66,6 @@ void main() {
       },
     );
 
-    flameBlocTester.testGameWidget(
-      'DrainBallContactCallback calls lost',
-      setUp: (game, tester) async {
-        final contactCallback = DrainBallContactCallback();
-        final ball = MockControlledBall();
-        final drain = MockDrain();
-        final controller = MockBallController();
-        when(() => ball.controller).thenReturn(controller);
-
-        contactCallback.begin(ball, drain, MockContact());
-
-        verify(() => ball.controller.lost()).called(1);
-      },
-    );
-
     group('turboCharge', () {
       setUpAll(() {
         registerFallbackValue(Vector2.zero());

test/game/components/drain_test.dart

@@ -3,7 +3,8 @@
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:pinball_components/pinball_components.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:pinball/game/game.dart';
 
 import '../../helpers/helpers.dart';
 
@@ -41,5 +42,19 @@ void main() {
         expect(drain.body.fixtures.first.isSensor, isTrue);
       },
     );
+
+    test(
+      'calls lost on contact with ball',
+      () async {
+        final drain = Drain();
+        final ball = MockControlledBall();
+        final controller = MockBallController();
+        when(() => ball.controller).thenReturn(controller);
+
+        drain.beginContact(ball, MockContact());
+
+        verify(controller.lost).called(1);
+      },
+    );
   });
 }