在 flutter_driver 测试期间图像不可见

Question

使用 Flutter 驱动程序运行 UI 测试时，资产不会显示在 iPhone 模拟器上。当应用程序从 VS Code 以调试模式运行时，它们会显示出来。

我试图在flutter create -i swift -a kotlin --androidx --org com.example example 生成的示例项目上重现它，但没有成功。根据本文，我遵循完全相同的过程在两个应用程序中引入 flutter_driver 测试。不幸的是，在我的应用程序中没有显示图像，而在示例应用程序中它们看起来很好。我比较了 project.pbxproj 和 pubspec.yaml 文件，我觉得它们很好。

例如我的 pubspec.yaml:

dev_dependencies:
  flutter_driver:
    sdk: flutter
  test: any
  flutter_test:
    sdk: flutter
  screenshots:

flutter:
  uses-material-design: true

  assets:
    - assets/lang/pl.json
    - assets/images/

有什么可以帮助我解决这个问题吗？我可以做些什么来调试问题？

日志

注意，这是一个很长的日志输出。

flutter drive --target=test_driver/app.dart --verbose

https://gist.github.com/orestesgaolin/861c4f191773ca152b400d97ced2daeb

颤振医生

flutter doctor -v

[✓] Flutter (Channel stable, v1.7.8+hotfix.4, on Mac OS X 10.14.6 18G87, locale pl-PL)
    • Flutter version 1.7.8+hotfix.4 at /Users/dominik/Library/flutter
    • Framework revision 20e59316b8 (6 weeks ago), 2019-07-18 20:04:33 -0700
    • Engine revision fee001c93f
    • Dart version 2.4.0


[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at /Users/dominik/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • ANDROID_SDK_ROOT = /Users/dominik/Library/Android/sdk
    • Java binary at: /Users/dominik/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/191.5791312/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 10.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 10.3, Build version 10G8
    • CocoaPods version 1.7.5

[✓] iOS tools - develop for iOS devices
    • ios-deploy 1.9.4

[✓] Android Studio (version 3.5)
    • Android Studio at /Users/dominik/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/191.5791312/Android Studio.app/Contents
    • Flutter plugin version 37.1.1
    • Dart plugin version 183.6270
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] VS Code (version 1.37.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.3.0

[✓] Connected device (1 available)
    • iPhone Xs Max • C1A5534A-AE3A-4FB3-95F6-993E351FF2D3 • ios • com.apple.CoreSimulator.SimRuntime.iOS-12-4 (simulator)

• No issues found!

Answer 1

所以解决方案是创建单独的 main_test.dart 文件，将整个应用程序包装在 DefaultAssetBundle 中，如下所示：

runApp(DefaultAssetBundle(
      bundle: TestAssetBundle(),
      child: App(),
    ));

而TestAssetBundle 是这样的：

class TestAssetBundle extends CachingAssetBundle {
  @override
  Future<String> loadString(String key, {bool cache = true}) async {
    final ByteData data = await load(key);
    if (data == null) throw FlutterError('Unable to load asset');
    return utf8.decode(data.buffer.asUint8List());
  }

  @override
  Future<ByteData> load(String key) async => rootBundle.load(key);
}

在app.dart 中你必须引用正确的文件：

import 'package:flutter_driver/driver_extension.dart';
import 'package:playoo_league_player/main_test.dart' as app;

void main() {
  // This line enables the extension.
  enableFlutterDriverExtension();

  // Call the `main()` function of the app, or call `runApp` with
  // any widget you are interested in testing.
  app.main();
}

完整的解释可以在这里找到：https://medium.com/@sardox.vl/flutter-test-and-randomly-missing-assets-in-goldens-ea959cdd336a