refactor: fix PR nits

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

@@ -44,10 +44,9 @@ class ChromeDino extends BodyComponent with InitialPosition {
   Future<void> onLoad() async {
     await super.onLoad();
     final joint = await _anchorToJoint();
-    const halfAnimationPeriod = (_framesInAnimation / 2) * _animationFPS;
     await add(
       TimerComponent(
-        period: halfAnimationPeriod,
+        period: (_framesInAnimation / 2) * _animationFPS,
         onTick: joint._swivel,
         repeat: true,
       ),
@@ -86,11 +85,7 @@ class ChromeDino extends BodyComponent with InitialPosition {
   }
 }
 
-/// {@template chrome_dino_anchor}
-/// [JointAnchor] positioned at the back of the [ChromeDino].
-/// {@endtemplate}
 class _ChromeDinoAnchor extends JointAnchor {
-  /// {@macro chrome_dino_anchor}
   _ChromeDinoAnchor();
 
   // TODO(allisonryan0002): if these aren't moved when fixing the rendering, see
@@ -120,9 +115,8 @@ class _ChromeDinoAnchorRevoluteJointDef extends RevoluteJointDef {
       chromeDino.body.position + anchor.body.position,
     );
     enableLimit = true;
-    const angle = _ChromeDinoJoint._halfSweepingAngle;
-    lowerAngle = -angle;
-    upperAngle = angle;
+    lowerAngle = -_ChromeDinoJoint._halfSweepingAngle;
+    upperAngle = _ChromeDinoJoint._halfSweepingAngle;
 
     enableMotor = true;
     maxMotorTorque = chromeDino.body.mass * 255;

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

@@ -65,14 +65,12 @@ void main() {
     );
 
     group('swivels', () {
-      flameTester.testGameWidget(
+      flameTester.test(
         'up',
-        setUp: (game, tester) async {
-          await game.images.loadAll(assets);
+        (game) async {
           final chromeDino = ChromeDino();
           await game.ensureAdd(chromeDino);
           game.camera.followVector2(Vector2.zero());
-          await tester.pump();
 
           final sweepAnimationDuration = game
                   .descendants()
@@ -82,20 +80,17 @@ void main() {
                   .totalDuration() /
               2;
           game.update(sweepAnimationDuration * 1.5);
-          await tester.pump();
 
           expect(chromeDino.body.angularVelocity, isPositive);
         },
       );
 
-      flameTester.testGameWidget(
+      flameTester.test(
         'down',
-        setUp: (game, tester) async {
-          await game.images.loadAll(assets);
+        (game) async {
           final chromeDino = ChromeDino();
           await game.ensureAdd(chromeDino);
           game.camera.followVector2(Vector2.zero());
-          await tester.pump();
 
           final sweepAnimationDuration = game
                   .descendants()
@@ -105,7 +100,6 @@ void main() {
                   .totalDuration() /
               2;
           game.update(sweepAnimationDuration * 0.5);
-          await tester.pump();
 
           expect(chromeDino.body.angularVelocity, isNegative);
         },