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Questions tagged [flutter-test]

Flutter-Test contains tests related to Flutter app including Unit tests, Widget test and end-to-end integration tests using Flutter-Driver.

Flutter officially highlights 3 different types of testing as mentioned here: https://flutter.dev/docs/testing

Unit tests: A unit test tests a single function, method, or class.

Widget tests: A widget test (in other UI frameworks referred to as component test) tests a single widget.

Integration tests: An integration test tests a complete app or a large part of an app.

1961 questions
86
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12 answers

Widget test fails with No MediaQuery widget found

My question is about flutter widget test, what is proper way to test existing widgets wrapped new Scaffold(...)? I have found MediaQuery.of but it accepts BuildContext instead of Widget. Details: I have wrote simple login form widget and trying to…
Zufar Muhamadeev
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71
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7 answers

Another exception was thrown: type 'MyApp' is not a subtype of type 'StatelessWidget'

I have just started using Flutter and i'm having this problem while running my code "Another exception was thrown: type 'MyApp' is not a subtype of type 'StatelessWidget'". And the interesting part is that i dont even have this 'StatelessWidget' in…
Leonardo
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60
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11 answers

Because every version of flutter_test from sdk depends on... flutter_test from sdk is forbidden, version solving failed

I'm having this issue when I've added http dependency in my flutter project. Can anyone please help me with it?
Shoaib Nomani
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59
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18 answers

Flutter : Target file "lib/main.dart" not found

When I perform a flutter run I get an error Target file "lib/main.dart" not found. Why is this happening and how can I fix this ?
Keshav Aditya R P
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55
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12 answers

How to solve Not found: 'dart:ui' error while running integration tests on Flutter

I have an app, it is very simple and have just one widget. It is working fine, however when I run integration test by calling: $ flutter drive --target=test_driver/app.dart I get the following error: …
RobertoAllende
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54
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20 answers

How to solve "Unable to find git in your PATH" on Flutter?

I've just tried to install Flutter on Linux and when I try to run a flutter command (flutter doctor), I'm getting Error: Unable to find git in your PATH. How can I solve this?
Nikolay Shindarov
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47
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10 answers

Dart/Flutter Web unit testing errors: Error: Not found: 'dart:html'

I'm working on a Flutter web app and I'm having trouble running a test. Flutter 1.7.8+hotfix.4 • channel stable • git@github.com:flutter/flutter.git Framework • revision 20e59316b8 (9 weeks ago) • 2019-07-18 20:04:33 -0700 Engine • revision…
skillit zimberg
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46
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6 answers

Flutter: Test that a specific exception is thrown

in short, throwsA(anything) does not suffice for me while unit testing in dart. How to I test for a specific error message or type? Here is the error I would like to catch: class MyCustErr implements Exception { String term; String errMsg() =>…
xpeldev
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46
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3 answers

How to test code that uses DateTime.now in Flutter?

I have this class: import 'package:flutter/material.dart'; class AgeText extends StatelessWidget { final String dateOfBirth; const AgeText({Key key, @required this.dateOfBirth}) : super(key: key); @override Widget build(BuildContext…
Jordan Davies
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42
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8 answers

How to test Flutter widgets on different screen sizes?

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.
Jordan Davies
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42
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6 answers

How to test navigation via Navigator in Flutter

Let's say, I have a test for a screen in Flutter using WidgetTester. There is a button, which executes a navigation via Navigator. I would like to test behavior of that button. Widget/Screen class MyScreen extends StatefulWidget { MyScreen({Key…
Josef Adamcik
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41
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7 answers

How to Make Two Floating Action Button in Flutter?

Created counter app with one floating action button. If i want to add one more button for reset the counter, where can i add second floating action button at bottom bar? Also i have to add any method in void section or is there any reset counter…
fluttertalk
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41
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3 answers

Is it possible to access children/parent widgets from a given widget, in a Flutter test?

I'm writing unit and integration tests for Flutter. Is it possible to access children/parent widgets from a given widget?
Seth Ladd
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35
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4 answers

Bad state: Mock method was not called within `when()`. Was a real method called?

I'm trying to make a mock of an httpRequest in flutter using mockito. Here I define a global http client: library utgard.globals; import 'package:http/http.dart' as http; http.Client httpClient = http.Client(); Then I replace in integration…
Felipe Augusto
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33
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5 answers

After migrating flutter code to null-safety, mock objects not accepting `any`

After the release of Flutter 2, I've migrated my code to sdk: '>=2.12.0 <3.0.0' and all codes are "sound null safety" now. But I encountered errors in unit tests with mockito…
Arash
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