diff --git a/lib/game/pinball_game.dart b/lib/game/pinball_game.dart
index 653e8c37..5f6fbbdc 100644
--- a/lib/game/pinball_game.dart
+++ b/lib/game/pinball_game.dart
@@ -163,7 +163,6 @@ class _GameBallsController extends ComponentController<PinballGame>
   }
 }
 
-// coverage:ignore-start
 class DebugPinballGame extends PinballGame with FPSCounter, PanDetector {
   DebugPinballGame({
     required CharacterTheme characterTheme,
@@ -181,7 +180,7 @@ class DebugPinballGame extends PinballGame with FPSCounter, PanDetector {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
-    await add(_PreviewLine());
+    await add(PreviewLine());
 
     await add(_DebugInformation());
   }
@@ -211,23 +210,22 @@ class DebugPinballGame extends PinballGame with FPSCounter, PanDetector {
   void onPanEnd(DragEndInfo info) {
     if (lineEnd != null) {
       final line = lineEnd! - lineStart!;
-      onLine(line);
+      _turboChargeBall(line);
       lineEnd = null;
       lineStart = null;
     }
   }
 
-  void onLine(Vector2 line) {
+  void _turboChargeBall(Vector2 line) {
     final ball = ControlledBall.debug()..initialPosition = lineStart!;
     final impulse = line * -1 * 10;
     ball.add(BallTurboChargingBehavior(impulse: impulse));
     firstChild<ZCanvasComponent>()?.add(ball);
   }
 }
-// coverage:ignore-end
 
 // coverage:ignore-start
-class _PreviewLine extends PositionComponent with HasGameRef<DebugPinballGame> {
+class PreviewLine extends PositionComponent with HasGameRef<DebugPinballGame> {
   static final _previewLinePaint = Paint()
     ..color = Colors.pink
     ..strokeWidth = 0.4
@@ -246,10 +244,8 @@ class _PreviewLine extends PositionComponent with HasGameRef<DebugPinballGame> {
     }
   }
 }
-// coverage:ignore-end
 
 // TODO(wolfenrain): investigate this CI failure.
-// coverage:ignore-start
 class _DebugInformation extends Component with HasGameRef<DebugPinballGame> {
   @override
   PositionType get positionType => PositionType.widget;
diff --git a/test/game/pinball_game_test.dart b/test/game/pinball_game_test.dart
index f61e647d..5fed979f 100644
--- a/test/game/pinball_game_test.dart
+++ b/test/game/pinball_game_test.dart
@@ -25,6 +25,12 @@ class _MockTapUpDetails extends Mock implements TapUpDetails {}
 
 class _MockTapUpInfo extends Mock implements TapUpInfo {}
 
+class _MockDragStartInfo extends Mock implements DragStartInfo {}
+
+class _MockDragUpdateInfo extends Mock implements DragUpdateInfo {}
+
+class _MockDragEndInfo extends Mock implements DragEndInfo {}
+
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
   final assets = [
@@ -469,5 +475,68 @@ void main() {
         );
       },
     );
+
+    debugModeFlameTester.test(
+      'set lineStart on pan start',
+      (game) async {
+        final startPosition = Vector2.all(10);
+        final eventPosition = _MockEventPosition();
+        when(() => eventPosition.game).thenReturn(startPosition);
+
+        final dragStartInfo = _MockDragStartInfo();
+        when(() => dragStartInfo.eventPosition).thenReturn(eventPosition);
+
+        game.onPanStart(dragStartInfo);
+        await game.ready();
+
+        expect(
+          game.lineStart,
+          equals(startPosition),
+        );
+      },
+    );
+
+    debugModeFlameTester.test(
+      'set lineEnd on pan update',
+      (game) async {
+        final endPosition = Vector2.all(10);
+        final eventPosition = _MockEventPosition();
+        when(() => eventPosition.game).thenReturn(endPosition);
+
+        final dragUpdateInfo = _MockDragUpdateInfo();
+        when(() => dragUpdateInfo.eventPosition).thenReturn(eventPosition);
+
+        game.onPanUpdate(dragUpdateInfo);
+        await game.ready();
+
+        expect(
+          game.lineEnd,
+          equals(endPosition),
+        );
+      },
+    );
+
+    debugModeFlameTester.test(
+      'launch ball on pan end',
+      (game) async {
+        final startPosition = Vector2.zero();
+        final endPosition = Vector2.all(10);
+
+        game.lineStart = startPosition;
+        game.lineEnd = endPosition;
+
+        await game.ready();
+        final previousBalls =
+            game.descendants().whereType<ControlledBall>().toList();
+
+        game.onPanEnd(_MockDragEndInfo());
+        await game.ready();
+
+        expect(
+          game.descendants().whereType<ControlledBall>().length,
+          equals(previousBalls.length + 1),
+        );
+      },
+    );
   });
 }