下面涉及到的文件如下：
flutter_app/
├── lib/
│ └── .dart
├── test_driver/
| ├── app.dart
| └── app_test.dart
├── pubspec.yaml
在pubspec.yaml 文件中，添加flutter_driver插件，所以 flutter_driver并不是创建项目标配的，需要你额外安装。
dev_dependencies:
test: ^1.5.1
flutter_test:
sdk: flutter
flutter_driver:
sdk: flutter
然后在flutter应用根目录下执行命令：
flutter_app> flutter pub get
Running "flutter pub get" in flutter_app... 0.6s
在项目的跟目录下创建test_driver目录，分别在该目录下创建app.dart 和 app_test.dart文件。
一个指令化的应用程序是一个Flutter应用程序，它启用了Flutter Driver 扩展。启用扩展请调用enableFlutterDriverExtension()。app.dart文件内容如下：
// 导入扩展
import 'package:flutter_driver/driver_extension.dart';
// 导入main入口文件
import 'package:flutter_app/main.dart' as app;
void main() {
// 启用扩展
enableFlutterDriverExtension();
app.main();
}
集成测试是一个简单的package:test测试，它使用Flutter Driver API告诉应用程序执行什么操作，然后验证应用程序是否执行了此操作。
编写继承测试用例，app_test.dart文件内容如下：
import 'dart:io';
// Imports the Flutter Driver API
import 'package:flutter_driver/flutter_driver.dart';
import 'package:test/test.dart';
void main() {
group('计数器测试', () {
final counterTextFinder = find.byValueKey('counter');
FlutterDriver driver;
setUpAll(() async {
driver = await FlutterDriver.connect();
sleep(Duration(seconds: 2));
});
tearDownAll(() async {
if (driver != null) {
driver.close();
}
});
// 第一条用例
test('starts at 1', () async {
expect(await driver.getText(counterTextFinder), "0");
});
// 第二条用例
test('increments the counter', () async {
driver.tap(find.byTooltip("Increment"));
expect(await driver.getText(counterTextFinder), "1");
});
});
}
作为一个有多年测试经验的同学，单纯学习元素定位和断言也花了我半天时间。
setUpAll() & tearDownAll() ：定义用例开始和结束的执行动作。
driver = await FlutterDriver.connect();
链接接app，这是App测试的入口。
driver.close();
关闭浏览器。
driver.tap()
driver.enterText()
driver.getText()
...
flutter常用操作，触摸、输入和获取文本等。
find.byValueKey()
find.byTooltip()
...
元素定位，Flutter driver提供了好几种定位方式。
expect()
断言方法，断言两个值是否相等。
flutter driver API：
https://api.flutter.dev/flutter/flutter_driver/flutter_driver-library.html
运行集成测试
最后，如何运行集成测试：
flutter_app> flutter drive --target=./test_driver/app.dart
Using device Android SDK built for x86.
Starting application: ./test_driver/app.dart
Installing build\app\outputs\apk\app.apk... 1.5s
Running Gradle task 'assembleDebug'...
Running Gradle task 'assembleDebug'... Done 2.4s
✓ Built build\app\outputs\apk\debug\app-debug.apk.
I/flutter (16043): Observatory listening on http://127.0.0.1:58900/uUbkcJhS5qM=/
00:00 +0: 计数器测试 (setUpAll)
VMServiceFlutterDriver: Connecting to Flutter application at http://127.0.0.1:54121/uUbkcJhS5qM=/
VMServiceFlutterDriver: Isolate found with number: 4454864095217843
VMServiceFlutterDriver: Isolate is paused at start.
VMServiceFlutterDriver: Attempting to resume isolate
VMServiceFlutterDriver: Waiting for service extension
VMServiceFlutterDriver: Connected to Flutter application.
00:03 +0: 计数器测试 starts at 1
00:03 +1: 计数器测试 increments the counter
点击 add Icon
断言计数器加1
00:03 +2: 计数器测试 (tearDownAll)
00:03 +2: All tests passed!
Stopping application instance.
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