[verified] Publish ReelBox source under GPLv3

test/player_global_ownership_test.dart

@@ -0,0 +1,52 @@
+import 'dart:async';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:reelbox/media/media_helpers.dart';
+
+void main() {
+  for (final disposeFirst in [true, false]) {
+    test(
+      'old player teardown cannot overwrite new owner (dispose first=$disposeFirst)',
+      () async {
+        final old = PlaybackLifecycle();
+        final current = PlaybackLifecycle();
+        final pending = Completer<void>();
+        final writes = <String>[];
+        final oldSetup = old.setup([
+          () async {
+            writes.add('old-active');
+            await pending.future;
+          },
+        ]);
+        await Future<void>.delayed(Duration.zero);
+        late Future<void> teardown;
+        late Future<bool> newSetup;
+        Future<void> restoreOld() async {
+          writes.add('old-restore');
+        }
+
+        Future<void> setupNew() async {
+          writes.add('new-active');
+        }
+
+        if (disposeFirst) {
+          teardown = old.dispose(restoreOld);
+          newSetup = current.setup([setupNew]);
+        } else {
+          newSetup = current.setup([setupNew]);
+          teardown = old.dispose(restoreOld);
+        }
+        await Future<void>.delayed(Duration.zero);
+        pending.complete();
+        expect(await oldSetup, isFalse);
+        expect(await newSetup, isTrue);
+        await teardown;
+        expect(writes.last, 'new-active');
+        await current.dispose(() async {
+          writes.add('new-restore');
+        });
+        expect(writes.last, 'new-restore');
+      },
+    );
+  }
+}