// Copyright 2016 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'package:flutter/scheduler.dart'; import 'package:flutter_driver/src/extension.dart'; import 'package:flutter_driver/src/find.dart'; import 'package:flutter_test/flutter_test.dart'; void main() { group('waitUntilNoTransientCallbacks', () { FlutterDriverExtension extension; Map<String, dynamic> result; setUp(() { result = null; extension = new FlutterDriverExtension(); }); testWidgets('returns immediately when transient callback queue is empty', (WidgetTester tester) async { extension.call(new WaitUntilNoTransientCallbacks().serialize()) .then<Null>(expectAsync1((Map<String, dynamic> r) { result = r; })); await tester.idle(); expect( result, <String, dynamic>{ 'isError': false, 'response': null, }, ); }); testWidgets('waits until no transient callbacks', (WidgetTester tester) async { SchedulerBinding.instance.scheduleFrameCallback((_) { // Intentionally blank. We only care about existence of a callback. }); extension.call(new WaitUntilNoTransientCallbacks().serialize()) .then<Null>(expectAsync1((Map<String, dynamic> r) { result = r; })); // Nothing should happen until the next frame. await tester.idle(); expect(result, isNull); // NOW we should receive the result. await tester.pump(); expect( result, <String, dynamic>{ 'isError': false, 'response': null, }, ); }); }); }