flutter-test

问题 I'm writing unit and integration tests for Flutter. Is it possible to access children/parent widgets from a given widget? 回答1: Yes, you can use find.descendant and Element.ancestorWidgetOfExactType. Examples: // Finds a RichText widget that a descendant (child/grand-child/etc) of a // tab widget with text "Tab 1" find.descendant(of: find.text('Tab 1'), matching: find.byType(RichText)); // Finds a parent widget of type MyParentWidget. tester.element(find.byType(MyChildWidget))

问题 I want to crop a rectangular image-file and make it circular or square or hexagon shape and save it as image-file locally . I have a bitmap and I want to crop a circular or hexagon region from this bitmap. All pixels outside the circle should be transparent. How can I do this? I found the similar question in android platform. But unable to find a good resource that really help or direct me to achieve this in flutter. Please share me the idea to achieve this result. 回答1: Use Clipper to crop

问题 I'm failing to run my first ever Flutter App. Getting the below error. Launching lib\main.dart on Android SDK built for x86 in debug mode... Initializing gradle... Resolving dependencies... * Error running Gradle: Exit code 1 from: D:\PROJECTS\softwareProjects\AndroidProjects\flutter_app_2\android\gradlew.bat app:properties: Download https://jcenter.bintray.com/org/bouncycastle/bcprov-jdk15on/1.56/bcprov-jdk15on-1.56.jar FAILURE: Build failed with an exception. * What went wrong: A problem

问题 How do I go about making sure the ui (widget) throws an exception during widget testing in Flutter. Here is my code that does not work: expect( () => tester.tap(find.byIcon(Icons.send)), throwsA(const TypeMatcher<UnrecognizedTermException>()), ); It fails with the following error ... Expected: throws <Instance of 'TypeMatcher<UnrecognizedTermException>'> Actual: <Closure: () => Future<void>> Which: returned a Future that emitted <null> OR......should I be testing how the UI handles an

问题 I have a periodic timer in one of my StatelessWidget 's. Without going too much into detail, here is a snippet of code producing a timer: class AnniversaryHomePage extends StatelessWidget { . . . void _updateDisplayTime(StoreInheritedWidget inheritedWidget) { String anniversaryString = inheritedWidget.prefs.getString('anniversaryDate'); inheritedWidget.store.dispatch(DateTime.parse(anniversaryString)); } /// Widget Methods @override Widget build(BuildContext context) { final inheritedWidget =

问题 When displaying multiple children in a ListView, if a child is off-screen it can't be found by a widget test. Here's a full example: main.dart import 'package:flutter/material.dart'; void main() => runApp(App()); class App extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp(home: Scaffold(body: Test())); } } class Test extends StatelessWidget { @override Widget build(BuildContext context) { return ListView( children: <Widget>[ Container( height: 600,

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

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

问题 I have a Flutter widget which shows extra data depending on the screen size. Does anyone know a way of testing this widget on multiple different screen sizes? I've had a look through the widget_tester source code but can't find anything. 回答1: You can specify custom surface size by using TestWidgetsFlutterBinding The following code will run a test with a screen size of 42x42 import 'package:flutter/widgets.dart'; import 'package:flutter_test/flutter_test.dart'; void main() { final

问题 I wonder how I can test the case when a future is not yet completed in flutter widget tests. The widget should show a spinner as long as the future is unresolved. I tride this test case: testWidgets( 'should show a spinner when loading', (WidgetTester tester) async { when(valueRepository.getValues()) .thenAnswer((_) => Future.delayed(Duration(seconds: 30), () => [])); await tester.pumpWidget(withApp(ValueListPage( valueRepository: valueRepository, ))); await tester.pumpAndSettle( Duration