28

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.

4

7 回答 7

49

您可以使用WidgetTester指定自定义表面大小

以下代码将运行屏幕尺寸为 42x42 的测试

import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets("foo", (tester) async {
    tester.binding.window.physicalSizeTestValue = Size(42, 42);

    // resets the screen to its original size after the test end
    addTearDown(tester.binding.window.clearPhysicalSizeTestValue);

    // TODO: do something
  });
}
于 2018-12-10T13:48:35.777 回答
27

不知道为什么，但@rémi-rousselet 的解决方案对我不起作用。我必须使用指定屏幕尺寸binding.window.physicalSizeTestValue，binding.window.devicePixelRatioTestValue以便输出完全确定

我为像我这样的 Flutter 初学者添加了更多代码。检查这个：

void main() {

  final TestWidgetsFlutterBinding binding =
    TestWidgetsFlutterBinding.ensureInitialized();

  testWidgets("Basic layout test (mobile device)", (tester) async {
    binding.window.physicalSizeTestValue = Size(400, 200);
    binding.window.devicePixelRatioTestValue = 1.0;

    await tester.pumpWidget(new MyApp());

    expect(find.byType(MyHomePage), findsOneWidget);
    // etc.
  });
}
于 2019-03-05T18:37:26.293 回答
9

有一个名为device_preview的包可以模拟你在不同设备上运行的 Flutter 应用。

于 2020-07-17T19:38:15.633 回答
6

@rémi-rousselet 的解决方案完美运行！

此外，如果您想测试方向更改，请尝试以下操作：

const double PORTRAIT_WIDTH = 400.0;
const double PORTRAIT_HEIGHT = 800.0;
const double LANDSCAPE_WIDTH = PORTRAIT_HEIGHT;
const double LANDSCAPE_HEIGHT = PORTRAIT_WIDTH;

final TestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();

await binding.setSurfaceSize(Size(PORTRAIT_WIDTH, PORTRAIT_HEIGHT));
await tester.pumpWidget(MyWidget());

// test in portrait

await binding.setSurfaceSize(Size(LANDSCAPE_WIDTH, LANDSCAPE_HEIGHT));
await tester.pumpAndSettle();

// OrientationBuilder gets triggered

// test in landscape
于 2019-03-27T14:39:25.620 回答
3

你可以试试这个小部件来测试你的小部件实时改变屏幕大小

屏幕尺寸测试

https://pub.dev/packages/screen_size_test

预习

在此处输入图像描述

演示 https://dartpad.dartlang.org/43d9c47a8bf031ce3ef2f6314c9dbd52

代码示例

import 'package:screen_size_test/screen_size_test.dart';
...
MaterialApp(
  title: 'Demo',
  builder: (context, child) => ScreenSizeTest(
    child: child,
  ),
  home: Scaffold(
    body: ListView(
      children: List.generate(
          20,
          (index) => Container(
                padding: EdgeInsets.all(10),
                child: Placeholder(),
              )),
    ),
  ),
)
于 2021-01-15T11:50:25.530 回答
1

尽管@Rémi Rousselet 的回答非常有帮助，但并没有完全解决我的问题。事实证明，我可以将待测小部件包装在MediaQuery小部件中并设置大小。

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  Widget makeTestableWidget({Widget child, Size size}) {
    return MaterialApp(
      home: MediaQuery(
        data: MediaQueryData(size: size),
        child: child,
      ),
    );
  }

  testWidgets("tablet", (tester) async {
    final testableWidget = makeTestableWidget(
      child: WidgetUnderTest(),
      size: Size(1024, 768),
    );

    ...
  });

  testWidgets("phone", (tester) async {
    final testableWidget = makeTestableWidget(
      child: WidgetUnderTest(),
      size: Size(375, 812),
    );

    ...
  });
}
于 2018-12-11T15:03:38.377 回答
0

目前最安全的方法是使用setSurfaceSize

import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets("foo", (tester) async {
    tester.binding.setSurfaceSize(Size(400, 400));

    // reset
    tester.binding.setSurfaceSize(null);

    // continue
  });
}

请参阅此处了解相关的 Github 问题

于 2022-02-14T12:07:31.880 回答