test: tested plunger controller

test/game/components/controlled_plunger_test.dart

@@ -1,5 +1,6 @@
 import 'dart:collection';
 
+import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -34,8 +35,7 @@ void main() {
           'moves down '
           'when ${event.logicalKey.keyLabel} is pressed',
           (game) async {
-            await game.ready();
-            await game.add(plunger);
+            await game.ensureAdd(plunger);
             controller.onKeyEvent(event, {});
 
             expect(plunger.body.linearVelocity.y, isNegative);
@@ -47,10 +47,11 @@ void main() {
       testRawKeyUpEvents(downKeys, (event) {
         flameTester.test(
           'moves up '
-          'when ${event.logicalKey.keyLabel} is released',
+          'when ${event.logicalKey.keyLabel} is released '
+          'and plunger is below its starting position',
           (game) async {
-            await game.ready();
-            await game.add(plunger);
+            await game.ensureAdd(plunger);
+            plunger.body.setTransform(Vector2(0, -1), 0);
             controller.onKeyEvent(event, {});
 
             expect(plunger.body.linearVelocity.y, isPositive);
@@ -58,6 +59,20 @@ void main() {
           },
         );
       });
+
+      testRawKeyUpEvents(downKeys, (event) {
+        flameTester.test(
+          'does not move when ${event.logicalKey.keyLabel} is released '
+          'and plunger is in its starting position',
+          (game) async {
+            await game.ensureAdd(plunger);
+            controller.onKeyEvent(event, {});
+
+            expect(plunger.body.linearVelocity.y, isZero);
+            expect(plunger.body.linearVelocity.x, isZero);
+          },
+        );
+      });
     });
   });
 }