refactor: bottom group to component

lib/game/components/bottom_group.dart

@@ -1,7 +1,6 @@
 import 'package:flame/components.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
-import 'package:pinball_flame/pinball_flame.dart';
 
 /// {@template bottom_group}
 /// Grouping of the board's symmetrical bottom [Component]s.
@@ -9,11 +8,11 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// The [BottomGroup] consists of [Flipper]s, [Baseboard]s and [Kicker]s.
 /// {@endtemplate}
 // TODO(allisonryan0002): Consider renaming.
-class BottomGroup extends Blueprint {
+class BottomGroup extends Component {
   /// {@macro bottom_group}
   BottomGroup()
       : super(
-          components: [
+          children: [
             _BottomGroupSide(side: BoardSide.right),
             _BottomGroupSide(side: BoardSide.left),
           ],

lib/game/pinball_game.dart

@@ -45,7 +45,7 @@ class PinballGame extends Forge2DGame
     unawaited(add(CameraController(this)));
     unawaited(add(Backboard.waiting(position: Vector2(0, -88))));
     await add(Drain());
-    await addFromBlueprint(BottomGroup());
+    await add(BottomGroup());
     unawaited(addFromBlueprint(Boundaries()));
     unawaited(addFromBlueprint(LaunchRamp()));
 

test/game/components/bottom_group_test.dart

@@ -4,7 +4,6 @@ import 'package:flame_test/flame_test.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
-import 'package:pinball_flame/pinball_flame.dart';
 
 import '../../helpers/helpers.dart';
 
@@ -24,8 +23,10 @@ void main() {
     flameTester.test(
       'loads correctly',
       (game) async {
-        await game.addFromBlueprint(BottomGroup());
-        await game.ready();
+        final bottomGroup = BottomGroup();
+        await game.ensureAdd(bottomGroup);
+
+        expect(game.contains(bottomGroup), isTrue);
       },
     );
 
@@ -33,12 +34,13 @@ void main() {
       flameTester.test(
         'one left flipper',
         (game) async {
-          await game.addFromBlueprint(BottomGroup());
-          await game.ready();
+          final bottomGroup = BottomGroup();
+          await game.ensureAdd(bottomGroup);
 
-          final leftFlippers = game.descendants().whereType<Flipper>().where(
-                (flipper) => flipper.side.isLeft,
-              );
+          final leftFlippers =
+              bottomGroup.descendants().whereType<Flipper>().where(
+                    (flipper) => flipper.side.isLeft,
+                  );
           expect(leftFlippers.length, equals(1));
         },
       );
@@ -46,12 +48,13 @@ void main() {
       flameTester.test(
         'one right flipper',
         (game) async {
-          await game.addFromBlueprint(BottomGroup());
-          await game.ready();
+          final bottomGroup = BottomGroup();
+          await game.ensureAdd(bottomGroup);
 
-          final rightFlippers = game.descendants().whereType<Flipper>().where(
-                (flipper) => flipper.side.isRight,
-              );
+          final rightFlippers =
+              bottomGroup.descendants().whereType<Flipper>().where(
+                    (flipper) => flipper.side.isRight,
+                  );
           expect(rightFlippers.length, equals(1));
         },
       );
@@ -59,10 +62,11 @@ void main() {
       flameTester.test(
         'two Baseboards',
         (game) async {
-          await game.addFromBlueprint(BottomGroup());
-          await game.ready();
+          final bottomGroup = BottomGroup();
+          await game.ensureAdd(bottomGroup);
 
-          final basebottomGroups = game.descendants().whereType<Baseboard>();
+          final basebottomGroups =
+              bottomGroup.descendants().whereType<Baseboard>();
           expect(basebottomGroups.length, equals(2));
         },
       );
@@ -70,10 +74,10 @@ void main() {
       flameTester.test(
         'two Kickers',
         (game) async {
-          await game.addFromBlueprint(BottomGroup());
-          await game.ready();
+          final bottomGroup = BottomGroup();
+          await game.ensureAdd(bottomGroup);
 
-          final kickers = game.descendants().whereType<Kicker>();
+          final kickers = bottomGroup.descendants().whereType<Kicker>();
           expect(kickers.length, equals(2));
         },
       );

test/game/pinball_game_test.dart

@@ -80,6 +80,18 @@ void main() {
         },
       );
 
+      flameTester.test(
+        'has only one BottomGroup',
+        (game) async {
+          await game.ready();
+
+          expect(
+            game.children.whereType<BottomGroup>().length,
+            equals(1),
+          );
+        },
+      );
+
       flameTester.test(
         'has only one Plunger',
         (game) async {