refactor: PR suggestions

lib/game/components/baseboard.dart

@@ -10,8 +10,9 @@ class Baseboard extends BodyComponent {
   /// {@macro baseboard}
   Baseboard._({
     required Vector2 position,
-    required this.side,
+    required BoardSide side,
-  }) : _position = position;
+  })  : _position = position,
+        _side = side;
 
   /// A left positioned [Baseboard].
   Baseboard.left({
@@ -39,7 +40,7 @@ class Baseboard extends BodyComponent {
   final Vector2 _position;
 
   /// Whether the [Baseboard] is on the left or right side of the board.
-  final BoardSide side;
+  final BoardSide _side;
 
   List<FixtureDef> _createFixtureDefs() {
     final fixtures = <FixtureDef>[];
@@ -73,12 +74,14 @@ class Baseboard extends BodyComponent {
 
   @override
   Body createBody() {
+    // TODO(allisonryan0002): share sweeping angle with flipper when components
+    // are grouped.
     const angle = math.pi / 7;
 
     final bodyDef = BodyDef()
       ..position = _position
       ..type = BodyType.static
-      ..angle = side.isLeft ? -angle : angle;
+      ..angle = _side.isLeft ? -angle : angle;
 
     final body = world.createBody(bodyDef);
     _createFixtureDefs().forEach(body.createFixture);

lib/game/pinball_game.dart

@@ -27,7 +27,7 @@ class PinballGame extends Forge2DGame
 
     await _addGameBoundaries();
     unawaited(_addFlippers());
-    await _addBaseboards();
+    unawaited(_addBaseboards());
     unawaited(_addPlunger());
 
     // Corner wall above plunger so the ball deflects into the rest of the

test/game/components/baseboard_test.dart

@@ -25,16 +25,6 @@ void main() {
       },
     );
 
-    group('constructor', () {
-      test('sets BoardSide', () {
-        final leftBaseboard = Baseboard.left(position: Vector2.zero());
-        expect(leftBaseboard.side, equals(leftBaseboard.side));
-
-        final rightBaseboard = Baseboard.right(position: Vector2.zero());
-        expect(rightBaseboard.side, equals(rightBaseboard.side));
-      });
-    });
-
     group('body', () {
       flameTester.test(
         'positions correctly',

test/game/pinball_game_test.dart

@@ -82,6 +82,15 @@ void main() {
         );
       });
 
+      flameTester.test(
+        'Baseboards has two Baseboards',
+        (game) async {
+          await game.ready();
+          final baseboards = game.children.whereType<Baseboard>().toList();
+          expect(baseboards.length, 2);
+        },
+      );
+
       flameTester.test(
         'Plunger has only one Plunger',
         (game) async {