fix: coverage

packages/pinball_components/lib/src/components/chrome_dino.dart

@@ -43,7 +43,7 @@ class ChromeDino extends BodyComponent with InitialPosition {
     await add(
       TimerComponent(
         period: 1,
-        onTick: joint.swivel,
+        onTick: joint._swivel,
         repeat: true,
       ),
     );
@@ -150,7 +150,7 @@ class _ChromeDinoJoint extends RevoluteJoint {
   _ChromeDinoJoint(_ChromeDinoAnchorRevoluteJointDef def) : super(def);
 
   /// Sweeps the [ChromeDino] up and down repeatedly.
-  void swivel() {
+  void _swivel() {
     setMotorSpeed(-motorSpeed);
   }
 }

packages/pinball_components/test/src/components/chrome_dino_test.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: cascade_invocations
+
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -17,5 +19,20 @@ void main() {
         expect(game.contains(chromeDino), isTrue);
       },
     );
+
+    flameTester.test(
+      'swivels',
+      (game) async {
+        // TODO(alestiago): Write golden tests to check the
+        // swivel animation.
+        final chromeDino = ChromeDino();
+        await game.ensureAdd(chromeDino);
+
+        final previousPosition = chromeDino.body.position.clone();
+        game.update(64);
+
+        expect(chromeDino.body.position, isNot(equals(previousPosition)));
+      },
+    );
   });
 }