[verified] Publish ReelBox source under GPLv3

test/player_system_controls_test.dart

@@ -0,0 +1,52 @@
+import 'package:flutter/foundation.dart';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:reelbox/media/media_platform.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  tearDown(() {
+    debugDefaultTargetPlatformOverride = null;
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(MediaPlatform.channel, null);
+  });
+  test('player reads native control values and restores original window brightness', () async {
+    debugDefaultTargetPlatformOverride = TargetPlatform.android;
+    final writes = <double>[];
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(MediaPlatform.channel, (call) async {
+          switch (call.method) {
+            case 'getBrightness':
+              return -1.0;
+            case 'getEffectiveBrightness':
+              return .65;
+            case 'getVolume':
+              return .22;
+            case 'setBrightness':
+              writes.add((call.arguments as Map)['value'] as double);
+              return null;
+          }
+          return null;
+        });
+    final controls = PlayerSystemControls();
+    await controls.capture();
+    expect(controls.brightness, .65);
+    expect(controls.volume, .22);
+    await controls.restore();
+    expect(writes, [-1.0]);
+  });
+  test(
+    'leaving a player that never initialized does not change brightness',
+    () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.android;
+      var called = false;
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(MediaPlatform.channel, (call) async {
+            called = true;
+            return null;
+          });
+      await PlayerSystemControls().restore();
+      expect(called, isFalse);
+    },
+  );
+}