anchor.diff:          'has two Baseboards',
           (game) async {
             await game.ready();
  -          final baseboards = game.children.whereType<Baseboard>().toList();
  +          final baseboards = game.children.whereType<Baseboard>();
             expect(baseboards.length, 2);
           },
         );
  
positive.code:     // [BallScorePointsCallback] once the following issue is resolved:
      // https://github.com/flame-engine/flame/issues/1416
      group('components', () {
        bool Function(Component) componentSelector<T>() =>
            (component) => component is T;
  
        flameTester.test(
          'has three Walls',
          (game) async {
            await game.ready();
            final walls = game.children
                .where(
                  (component) => component is Wall && component is! BottomWall,
                )
                .toList();
            // TODO(allisonryan0002): expect 3 when launch track is added and
            // temporary wall is removed.
            expect(walls.length, 4);
  
negative.code:           await game.ready();
  
            expect(
              game.children.whereType<BottomWall>().length,
              equals(1),
            );
          },
        );
  