FlutterDriver：Flutter Driver 扩展需要很长时间才能可用

Question

我正在尝试按照网页中提供的说明运行 flutter 集成测试：https : //flutter.dev/docs/cookbook/testing/integration/introduction 但是当尝试使用 iOS 设备执行时，它总是因 flutterdriver 而失败超时，但如果我使用 android 设备执行同一段代码，它会成功运行。

执行的命令是：

flutter driver --target=test_driver/app.dart

并且（仅在 iOS 中），显示的错误如下：

...
flutter: Observatory listening on http://127.0.0.1:49605/Jh_J7boSKBk=/  
Installing and launching...                                        22.5s
[info ] FlutterDriver: Connecting to Flutter application at http://127.0.0.1:1043/Jh_J7boSKBk=/
[trace] FlutterDriver: Isolate found with number: 589047572
[trace] FlutterDriver: Isolate is paused at start.
[trace] FlutterDriver: Attempting to resume isolate
[trace] FlutterDriver: Waiting for service extension
flutter: main dev
[warning] FlutterDriver: Flutter Driver extension is taking a long time to become available. Ensure your test app (often "lib/main.dart") imports "package:flutter_driver/driver_extension.dart" and calls enableFlutterDriverExtension() as the first call in main().

看起来在iOS中执行时，它完全忽略了指定的目标，并试图直接运行lib/main.dart文件，但是，为什么？

我对以下网页说明的意思是使用 2 个文件进行测试：test_driver/app.dart 和 test_driver/app_test.dart

test_driver/app.dart

import 'package:flutter_driver/driver_extension.dart';
import 'package:my_app/main.dart' as app;

void main() async {
  // This line enables the extension
  await enableFlutterDriverExtension();

  // Call the `main()` function of your app or call `runApp` with any widget you
  // are interested in testing.
  await app.main();
}

test_driver/app_test.dart

import 'package:flutter_driver/flutter_driver.dart';
import 'package:test/test.dart';

void main() {
  group('end-to-end test', () {
    FlutterDriver driver;

    setUpAll(() async {
      // Connect to a running Flutter application instance.
      driver = await FlutterDriver.connect();
    });

    tearDownAll(() async {
      if (driver != null)
        driver.close();
    });

    test('whatever', () async {
       //whatever
    });
  });
}

正如这里评论的那样：#17184，它可以修复在 main.dart 中引入 enableFlutterDriverExtension()，但我宁愿不在应用程序代码中写任何额外的东西。

有没有可能使用另一种方法修复它？

谢谢

Answer 1

我已按照文档中的步骤编写集成测试，并且它在 Flutter stable（版本 1.22.5）和 master（版本 1.26.0-2.0.pre.281）通道上都运行良好。虽然文档中的命令演示了 的使用flutter drive，但 usingflutter driver似乎在我的测试中运行良好。

抛开这一点，即使我无法在本地复制该问题，该问题似乎也已通过按照检查评论的GitHub问题线程中提到的解决方法得到解决。