问题
I am trying to perform a widget test, specifically navigation test. I am using bloc architecture, setting a stream on the bloc triggers a series of events inside the bloc, gets session info from the server call (which returns a future of session info object), on successful server call a login stream is set and the widget has a stream subscription to this stream and navigates to the next screen.
I am using mockito to mock the server call and stubbing the server call to return a future of success response. The problem is the when I am calling pumpAndSettle() it is getting timed out as it is not waiting for the future to complete and return the success response.
I apologize if I am not making it very clear, but here is the sample code:
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);
});
});
On running the widget test the tester.pumpAndSettle() inside testWidgets times out before the future is completed. This is the error log:
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following assertion was thrown running a test:
pumpAndSettle timed out
When 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)
I would really appreciate any kind of help or feedback.
回答1:
Try wrapping your test with
testWidgets('Navigate to landing page on correct login url',
(WidgetTester tester) async {
await tester.runAsync(() async {
// test code here
});
});
来源：https://stackoverflow.com/questions/52176777/how-to-wait-for-a-future-to-complete-in-flutter-widget-test