test: moved mock from crossing ramps to helpers file

test/game/components/crossing_ramp_test.dart

@@ -7,12 +7,6 @@ import 'package:pinball/game/game.dart';
 
 import '../../helpers/helpers.dart';
 
-class MockBody extends Mock implements Body {}
-
-class MockArea extends Mock implements RampArea {}
-
-class MockRampAreaCallback extends Mock implements RampAreaCallback {}
-
 class FakeRampArea extends RampArea {
   FakeRampArea({
     required Vector2 position,

test/helpers/mocks.dart

@@ -12,10 +12,16 @@ class MockWall extends Mock implements Wall {}
 
 class MockBottomWall extends Mock implements BottomWall {}
 
+class MockBody extends Mock implements Body {}
+
 class MockBall extends Mock implements Ball {}
 
 class MockContact extends Mock implements Contact {}
 
+class MockArea extends Mock implements RampArea {}
+
+class MockRampAreaCallback extends Mock implements RampAreaCallback {}
+
 class MockGameBloc extends Mock implements GameBloc {}
 
 class MockThemeCubit extends Mock implements ThemeCubit {}