[verified] Publish ReelBox source under GPLv3

test/download_capabilities_test.dart

@@ -0,0 +1,58 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:reelbox/media/media_files_io.dart' as files;
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test(
+    'parallel optimization requires a successful HEAD with size and ranges',
+    () async {
+      final previous = HttpOverrides.current;
+      HttpOverrides.global = null;
+      addTearDown(() => HttpOverrides.global = previous);
+      final server = await HttpServer.bind(InternetAddress.loopbackIPv4, 0);
+      addTearDown(() => server.close(force: true));
+      final methods = <String>[];
+      server.listen((request) async {
+        methods.add(request.method);
+        switch (request.uri.path) {
+          case '/capable':
+            request.response.contentLength = 524288;
+            request.response.headers.set('accept-ranges', 'bytes');
+          case '/no-head':
+            request.response.statusCode = HttpStatus.methodNotAllowed;
+          case '/no-ranges':
+            request.response.contentLength = 524288;
+          case '/unknown-size':
+            request.response.headers.set('accept-ranges', 'bytes');
+          case '/forbidden':
+            request.response.statusCode = HttpStatus.forbidden;
+          default:
+            request.response.statusCode = HttpStatus.notFound;
+        }
+        await request.response.close();
+      });
+      String url(String path) => 'http://127.0.0.1:${server.port}$path';
+      expect(await files.supportsParallelDownload(url('/capable')), isTrue);
+      for (final path in [
+        '/no-head',
+        '/no-ranges',
+        '/unknown-size',
+        '/forbidden',
+      ]) {
+        expect(
+          await files.supportsParallelDownload(url(path)),
+          isFalse,
+          reason: path,
+        );
+      }
+      expect(methods, List.filled(5, 'HEAD'));
+      expect(
+        await files.supportsParallelDownload('file:///private.mp4'),
+        isFalse,
+      );
+    },
+  );
+}