dart – 如何在Flutter小部件测试中等待未来完成？

概述我正在尝试执行小部件测试,特别是导航测试.我正在使用bloc体系结构,在bloc上设置流会触发bloc内部的一系列事件,从服务器调用获取会话信息(返回会话信息对象的未来),在成功的服务器调用上设置登录流并且widget具有对此流的流订阅并导航到下一个屏幕. 我正在使用mockito来模拟服务器调用并对服务器调用进行存根以返回成功响应的未来.问题是当我调用pumpAndSettle()时,它正在超时 我正在尝试执行小部件测试,特别是导航测试.我正在使用bloc体系结构,在bloc上设置流会触发bloc内部的一系列事件,从服务器调用获取会话信息(返回会话信息对象的未来),在成功的服务器调用上设置登录流并且Widget具有对此流的流订阅并导航到下一个屏幕.

我正在使用mockito来模拟服务器调用并对服务器调用进行存根以返回成功响应的未来.问题是当我调用pumpAndSettle()时,它正在超时,因为它没有等待将来完成并返回成功响应.

如果我不是很清楚,我道歉,但这里是示例代码：

login_bloc.dart

class LoginBloc {  LoginRepository _loginRepository;  final String searchKeyword = "special-keyword";  final _urlString = PublishSubject<String>();  final _isLoggedIn = BehaviorSubject<bool>(seedValue: false);  final _errorMessage = PublishSubject<String>();  Observable<bool> get isLoggedIn => _isLoggedIn.stream;  Observable<String> get isErrorState => _errorMessage.stream;  LoginBloc({LoginRepository loginRepository})      : _loginRepository = loginRepository ?? LoginRepository() {          // Listen on the _urlString stream to call the function which checks for the special keyword and if a match is found make a server call    _urlString.stream.Listen((String url) {      _authorizationFullService(url);    });  }    // Search for special keyword and if a match is found call the server call function  voID _authorizationFullService(String url) {    if (url.contains(searchKeyword)) {      int index = url.indexOf(searchKeyword);      String result = url.substring(index + searchKeyword.length);      result = result.trim();      String decodedUrl = Uri.decodeFull(result);      if (decodedUrl != null && decodedUrl.length > 0) {        _fullServiceServerCall(decodedUrl);      } else {        _isLoggedIn.sink.add(false);      }    }  }    // Call server call function from repository which returns a future of the Authorization object  voID _fullServiceServerCall(String decodedUrl) {    _loginRepository        .getSession(decodedUrl)        .then(_handleSuccessAuthorization)        .catchError(_handleErrorState);  }    // Handle success response and set the login stream  voID _handleSuccessAuthorization(Authorization authorization) {    if (authorization != null && authorization.IDnumber != 0) {      _isLoggedIn.sink.add(true);    } else {      _isLoggedIn.sink.add(false);    }  }    // Handle error response and set the error stream  voID _handleErrorState(dynamic error) {    _isLoggedIn.sink.add(false);    _errorMessage.sink.add(error.toString());  }  voID dispose() {    _urlString.close();    _isLoggedIn.close();    _errorMessage.close();  }}

Widget_test.dart

group('Full Login Navigation test',() {    LoginRepository mockLoginRepository;    LoginBloc loginBloc;    NotificationBloc notificationBloc;    NavigatorObserver mockNavigatorObserver;    Authorization _auth;    String testUrl;    setUp(() {      mockLoginRepository = MockLoginRepository();      _auth = Authorization((auth) => auth        ..param1 = "foo"        ..param2 = "bar"        ..param3 = "foobar"        ..param4 = "barfoo");      loginBloc = LoginBloc(loginRepository: mockLoginRepository);      mockNavigatorObserver = MockNavigatorObserver();      testUrl = "http://test.test.com";    });    Future<Null> _buildFullLoginPage(LoginBloc loginBloc,NotificationBloc notificationBloc,WidgetTester tester) async {      when(mockLoginRepository.getSession(testUrl))          .thenAnswer((_) => Future.value(_auth));      await tester.pumpWidget(LoginBlocProvIDer(        child: NotificationBlocProvIDer(          child: MaterialApp(            home: LoginFullService(),onGenerateRoute: NavigationRoutes.routes,navigatorObservers: [mockNavigatorObserver],),notificationBloc: notificationBloc,loginBloc: loginBloc,));      //Todo: Remove casting to dynamic after dart sdk BUG fix: https://github.com/dart-lang/mockito/issues/163      verify(mockNavigatorObserver.dIDPush(any,any) as dynamic);      loginBloc.getAuthorization(          "http://testing.testing.com?search-keyword=http%3A%2F%2Ftest.test.com");    }    testWidgets('Navigate to landing page on correct login url',(WidgetTester tester) async {      await _buildFullLoginPage(loginBloc,notificationBloc,tester);      await tester.pumpAndSettle();      expect(find.byKey(Key('webvIEw_scaffold')),findsnothing);      //Todo: Remove casting to dynamic after dart sdk BUG fix: https://github.com/dart-lang/mockito/issues/163      verify(mockNavigatorObserver.dIDPush(any,any) as dynamic);    });});

在运行小部件测试时,testWidgets中的tester.pumpAndSettle()在未来完成之前超时.这是错误日志：

══╡ EXCEPTION CAUGHT BY FlutteR TEST FRAMEWORK ╞════════════════════════════════════════════════════The following assertion was thrown running a test:pumpAndSettle timed outWhen the exception was thrown,this was the stack:#0      WidgetTester.pumpAndSettle.<anonymous closure> (package:Flutter_test/src/Widget_tester.dart:299:11)<asynchronous suspension>#3      TestAsyncUtils.guard (package:Flutter_test/src/test_async_utils.dart:69:41)#4      WidgetTester.pumpAndSettle (package:Flutter_test/src/Widget_tester.dart:295:27)#5      main.<anonymous closure>.<anonymous closure> (file:///Users/ssIDdh/documents/projects/mobile-Flutter/test/ui/pages/login/login_full_test.dart:114:20)<asynchronous suspension>#6      testWidgets.<anonymous closure>.<anonymous closure> (package:Flutter_test/src/Widget_tester.dart:72:23)#7      TestWidgetsFlutterBinding._runTestbody (package:Flutter_test/src/binding.dart:555:19)<asynchronous suspension>#10     TestWidgetsFlutterBinding._runTest (package:Flutter_test/src/binding.dart:539:14)#11     automatedTestWidgetsFlutterBinding.runTest.<anonymous closure> (package:Flutter_test/src/binding.dart:883:24)#17     automatedTestWidgetsFlutterBinding.runTest (package:Flutter_test/src/binding.dart:880:15)#18     testWidgets.<anonymous closure> (package:Flutter_test/src/Widget_tester.dart:71:22)#19     Declarer.test.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test/src/backend/declarer.dart:168:27)<asynchronous suspension>#20     Invoker.waitForOutstandingCallbacks.<anonymous closure> (package:test/src/backend/invoker.dart:249:15)<asynchronous suspension>#25     Invoker.waitForOutstandingCallbacks (package:test/src/backend/invoker.dart:246:5)#26     Declarer.test.<anonymous closure>.<anonymous closure> (package:test/src/backend/declarer.dart:166:33)#31     Declarer.test.<anonymous closure> (package:test/src/backend/declarer.dart:165:13)<asynchronous suspension>#32     Invoker._onRun.<anonymous closure>.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test/src/backend/invoker.dart:403:25)<asynchronous suspension>#46     _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)#47     _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)#48     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:169:12)(elIDed 30 frames from class _FakeAsync,package dart:async,and package stack_trace)

我真的很感激任何帮助或反馈.

解决方法@H_301_35@ 尝试用你的测试包装

testWidgets('Navigate to landing page on correct login url',(WidgetTester tester) async {    await tester.runAsync(() async {      // test code here    }); });

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