Flutter 驱动程序处理最小化的应用程序

Question

我正在为我的 flutter 应用程序制作一些测试场景。其中一项功能是“关于我们”部分。当点击“关于我们”时，用户被重定向到网页并且应用程序被最小化。这是一个问题，因为测试场景在这个地方失败了。 Flutter 无法找到任何组件，并且在此特定错误上失败

Unhandled exception:
DriverError: Failed to fulfill Tap due to remote error
Original error: Bad state: The client closed with pending request "ext.flutter.driver".
Original stack trace:
#0      new Client.withoutJson.<anonymous closure> (package:json_rpc_2/src/client.dart:70:24)
#1      _RootZone.run (dart:async/zone.dart:1445:54)
#2      _FutureListener.handleWhenComplete (dart:async/future_impl.dart:167:18)
#3      Future._propagateToListeners.handleWhenCompleteCallback (dart:async/future_impl.dart:666:39)
#4      Future._propagateToListeners (dart:async/future_impl.dart:722:37)
#5      Future._propagateToListeners (dart:async/future_impl.dart:621:9)
#6      Future._completeWithValue (dart:async/future_impl.dart:529:5)
#7      Future._asyncCompleteWithValue.<anonymous closure> (dart:async/future_impl.dart:567:7)
#8      _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#9      _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#10     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#11     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:404:11)
#12     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:428:5)
#13     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)


#0      VMServiceFlutterDriver.sendCommand (package:flutter_driver/src/driver/vmservice_driver.dart:345:7)
<asynchronous suspension>
#1      FlutterDriver.tap (package:flutter_driver/src/driver/driver.dart:207:11)
#2      LoginPage.tapOnAboutUs (file:///D:/Projects/app/test_driver/page_objects/login_page.dart:52:19)
#3      aboutUs_steps.iClickOnAboutUsOnLoginPage (file:///D:/Projects/app/test_driver/steps/aboutUs_steps.dart:16:15)
<asynchronous suspension>
#4      _InstanceMirror._invoke (dart:mirrors-patch/mirrors_impl.dart:337:37)
#5      _InstanceMirror.invoke (dart:mirrors-patch/mirrors_impl.dart:333:25)
#6      OguretsState.invokeStep.<anonymous closure> (package:ogurets/src/ogurets_internal.dart:316:29)
#7      new Future.sync (dart:async/future.dart:223:31)
#8      OguretsState.invokeStep (package:ogurets/src/ogurets_internal.dart:315:25)
#9      OguretsState.executeStep (package:ogurets/src/ogurets_internal.dart:296:13)
<asynchronous suspension>
#10     OguretsState._findClassStyleStepRunners.<anonymous closure> (package:ogurets/src/ogurets_internal.dart:270:19)
#11     _Scenario._executeSubScenario (package:ogurets/src/model/scenario.dart:163:43)
<asynchronous suspension>
#12     _Scenario.execute (package:ogurets/src/model/scenario.dart:57:17)
#13     _Feature.execute (package:ogurets/src/model/feature.dart:41:64)
#14     OguretsOpts.processFeatureFile (package:ogurets/src/ogurets_opts.dart:327:49)
<asynchronous suspension>
#15     OguretsOpts.run (package:ogurets/src/ogurets_opts.dart:303:17)
<asynchronous suspension>
#16     main (file:///D:/Projects/app/test_driver/ogurets_flutter_test.dart:30:13)
#17     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
#18     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)

是否有任何可能的解决方案可以从后台最小化应用程序？
我试图使用默认的 flutter 钩子(Hook)，但没有正确的结果。
这些是我使用的文件和方法

Feature: AboutUsLink
  As a tester I test the functionality of the About Us link


  Scenario: Login - About us - Button functionality
    Given I click on About us on Login Page



class aboutUs_steps {
  FlutterOgurets _world;

  aboutUs_steps(this._world);

  @Given(r'I click on About us on Login Page')
  void iClickOnAboutUsOnLoginPage() async {
    LoginPage loginPage = new LoginPage(_world.driver);
    await Future.delayed(Duration(seconds: FUTURE_DELAY));
    loginPage.tapOnAboutUs();
  }
}

和 LoginPage 中的方法

  Future<void> tapOnAboutUs() async {
    await _driver.tap(aboutUs);
  }

Answer 1

在这种情况下，我会选择小部件测试而不是集成测试(使用 flutter 驱动程序)，因为它执行起来更快并且更容易验证正确的行为
问:如何为打开外部应用程序的功能编写测试(例如 Web 浏览器中的 URL)。
答:使用诸如 launch() 之类的方法重定向到网站或任何其他外部 URL 时，您想测试是否将正确的参数传递给 launch() - 在您的情况下，这将类似于 https://example.com/about
实现:
您需要模拟 launch() 并验证它是否已使用正确的参数调用，测试可能看起来像这样，您的 LoginPage 可以传递给启动器的模拟:

class MockLauncher extends Mock {}

void main() {
  MockLauncher mockLauncher; 
  setUp() {
    mockLauncher = MockLauncher();
    when(mockLauncher.launch(any)).thenReturn(true);
  }
  testWidgets('click on About us', (WidgetTester tester)
  async {
    await tester.pumpWidget(LoginPage(launcher: mockLauncher.launch));
    await tester.tap(find.byKey(ValueKey('about_us_link')));
    verify(mockLauncher.launch('https://example.com/about'));
    verifyNoMoreInteractions(mockLauncher);
  });
}

import 'package:url_launcher/url_launcher.dart';

class LoginPage extends ...{
  Function urlLauncher;

  LoginPage({this.urlLauncher}) {
    urlLauncher ??= launcher // use mock if it is passed in
  }
}

同样的方法也可以用于集成测试，但我建议重新评估你这样做的原因，因为上面的测试策略对于大多数重定向场景应该是足够的。