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void _result(bool success, [List<String> messages]) {
  final joinedMessages = messages?.map((m) => m.toString())?.join(',') ?? '';
  print('success: $success, "messages": $joinedMessages');
}

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// Copyright 2019 the Dart project 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_web/material.dart';
import 'package:flutter_web_test/flutter_web_test.dart';
import 'package:flutter_web_ui/ui.dart' as ui;

const owl_url = 'https://raw.githubusercontent.com/flutter/website/master/src/images/owl.jpg';

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import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [

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import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';

void main() async {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: MyApp(),
      ),

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import 'package:flutter/material.dart';

class Product {
  const Product({this.name});
  final String name;
}

typedef void CartChangedCallback(Product product, bool inCart);

class ShoppingListItem extends StatelessWidget {

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import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        BlueBox(),

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void printOrderMessage () async {
  try {
    var order = await fetchUserOrder();
    print('Awaiting user order...');
    print(order);
  } catch (err) {
    print('Caught error: $err');
  }
}

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// This example shows how *not* to write asynchronous Dart code.

String createOrderMessage () {
  var order = fetchUserOrder();
  return 'Your order is: $order';
}

Future<String> fetchUserOrder() {
  // Imagine that this function is more complex and slow
  return Future.delayed(Duration(seconds: 4), () => 'Large Latte');

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Did you remember to add the async keyword to the reportUserRole function?

Did you remember to use the await keyword before invoking fetchRole?

Remember: reportUserRole needs to return a future!

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// Part 1
addHello(){}

// Part 2
//You can call the provided async function fetchUsername to return the username
greetUser(){}

// Part 3
//You can call the provided async function logoutUser to logout the user
sayGoodbye(){}