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// Smoke test for the V bridge behind the UI. Runs on the host, so it loads
// the same libvflutter.so the desktop app does.

import 'package:flutter_test/flutter_test.dart';

import 'package:vflutter_ffi_example/main.dart';

void main() {
  testWidgets('renders results computed in V', (WidgetTester tester) async {
    await tester.pumpWidget(const ExampleApp());

    // vf_add across the C ABI.
    expect(find.text('42'), findsOneWidget);

    // vf_greet round-trips a string and frees the V allocation.
    expect(find.text('Hello, Flutter, from V!'), findsOneWidget);
  });

  testWidgets('background isolate returns the same answer',
      (WidgetTester tester) async {
    await tester.pumpWidget(const ExampleApp());

    expect(find.text('(not run)'), findsNWidgets(2));

    // greetAsync spawns a real isolate, which the default fake-async clock
    // never lets complete — runAsync is required for the await to resolve.
    await tester.runAsync(() async {
      await tester.tap(find.text('run on background isolate'));
      await Future<void>.delayed(const Duration(seconds: 2));
    });
    await tester.pump();

    // Once on the sync row, once on the async row.
    expect(find.text('Hello, Flutter, from V!'), findsNWidgets(2));
  });
}