test: tests for plunger controller

test/game/components/controlled_plunger_test.dart

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+import 'dart:collection';
+
+import 'package:flame_test/flame_test.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pinball/game/game.dart';
+import 'package:pinball_components/pinball_components.dart';
+
+import '../../helpers/helpers.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  final flameTester = FlameTester(EmptyPinballGameTest.new);
+
+  group('PlungerController', () {
+    group('onKeyEvent', () {
+      final downKeys = UnmodifiableListView([
+        LogicalKeyboardKey.arrowDown,
+        LogicalKeyboardKey.space,
+        LogicalKeyboardKey.keyS,
+      ]);
+
+      late Plunger plunger;
+      late PlungerController controller;
+
+      setUp(() {
+        plunger = Plunger(compressionDistance: 10);
+        controller = PlungerController(plunger);
+        plunger.add(controller);
+      });
+
+      testRawKeyDownEvents(downKeys, (event) {
+        flameTester.test(
+          'moves down '
+          'when ${event.logicalKey.keyLabel} is pressed',
+          (game) async {
+            await game.ready();
+            await game.add(plunger);
+            controller.onKeyEvent(event, {});
+
+            expect(plunger.body.linearVelocity.y, isNegative);
+            expect(plunger.body.linearVelocity.x, isZero);
+          },
+        );
+      });
+
+      testRawKeyUpEvents(downKeys, (event) {
+        flameTester.test(
+          'moves up '
+          'when ${event.logicalKey.keyLabel} is released',
+          (game) async {
+            await game.ready();
+            await game.add(plunger);
+            controller.onKeyEvent(event, {});
+
+            expect(plunger.body.linearVelocity.y, isPositive);
+            expect(plunger.body.linearVelocity.x, isZero);
+          },
+        );
+      });
+    });
+  });
+}