解析图像时抛出以下断言：无法加载资产：AssetManifest.json

如何解决解析图像时抛出以下断言：无法加载资产：AssetManifest.json

因此，我制作了一个使用图像资源的 pub.dev flutter package。

class GoogleIcon extends StatelessWidget {
  final bool isEnabled;

  const GoogleIcon({
    Key key = const Key('google-icon'),this.isEnabled = true,}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Opacity(
      opacity: isEnabled ? 1 : 0.5,child: Image.asset(
        'assets/google.png',key: Key('google-icon-image'),package: 'arculus_auth_widgets',),);
  }
}

在该库中，每个小部件测试都按预期运行。但是当我尝试在我的其他包（取决于它）的测试中使用该小部件时：

  testWidgets('should show buttons at the bottom',(tester) async {
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: ArculusOnboardingBody(
            buttons: [
              ArculusGoogleButton(label: 'Continue with Google'),// This widget contains GoogleIcon in it
            ],);

    await tester.pumpAndSettle(Duration(milliseconds: 100));
  });

失败了

==╡ 图像资源服务捕获的异常 ╞＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ === 以下解析图像时抛出断言：无法加载资产： AssetManifest.json

当抛出异常时，这是堆栈： #0 PlatformAssetBundle.load (package:Flutter/src/services/asset_bundle.dart:225:7) #1 AssetBundle.loadString (package:Flutter/src/services/asset_bundle.dart:68:33) #2 CachingAssetBundle.loadString (package:Flutter/src/services/asset_bundle.dart:167:18) #3 CachingAssetBundle.loadStructuredData (package:Flutter/src/services/asset_bundle.dart:188:5) #4 Assetimage.obtainKey (package:Flutter/src/painting/image_resolution.dart:176:18) #5 ScrollAwareImageProvider.obtainKey (package:Flutter/src/widgets/scroll_aware_image_provider.dart:115:74) #6 ImageProvider._createErrorHandlerAndKey。（包：Flutter/src/painting/image_provider.dart:455:15） #10 ImageProvider._createErrorHandlerAndKey (package:Flutter/src/painting/image_provider.dart:452:16) #11 ImageProvider.resolve (package:Flutter/src/painting/image_provider.dart:330:5) #12 _ImageState._resolveImage (package:Flutter/src/widgets/image.dart:1156:16) #13 _ImageState.didChangeDependencies (package:Flutter/src/widgets/image.dart:1109:5) #14 StatefulElement._firstBuild (package:Flutter/src/widgets/framework.dart:4786:12) #15 ComponentElement.mount (package:Flutter/src/widgets/framework.dart:4601:5) ... 正常元件安装（16 帧） #31 Element.inflateWidget (package:Flutter/src/widgets/framework.dart:3569:14) #32 MultiChildRenderObjectElement.mount (package:Flutter/src/widgets/framework.dart:6236:32) ...正常元件安装（223 帧） #255 Element.inflateWidget (package:Flutter/src/widgets/framework.dart:3569:14) #256 MultiChildRenderObjectElement.mount (package:Flutter/src/widgets/framework.dart:6236:32) ...正常元件安装（37 帧） #293 Element.inflateWidget (package:Flutter/src/widgets/framework.dart:3569:14) #294 MultiChildRenderObjectElement.mount (package:Flutter/src/widgets/framework.dart:6236:32) ...正常元件安装（202 帧） #496 Element.inflateWidget (package:Flutter/src/widgets/framework.dart:3569:14) #497 MultiChildRenderObjectElement.mount (package:Flutter/src/widgets/framework.dart:6236:32) ...正常元件安装（267 帧） #764 Element.inflateWidget (package:Flutter/src/widgets/framework.dart:3569:14) #765 Element.updateChild (package:Flutter/src/widgets/framework.dart:3324:20) #766 RenderObjectToWidgetElement._rebuild（包：Flutter/src/widgets/binding.dart:1252:16） #767 RenderObjectToWidgetElement.update (package:Flutter/src/widgets/binding.dart:1230:5) #768 RenderObjectToWidgetElement.performRebuild（包：Flutter/src/widgets/binding.dart:1244:7） #769 Element.rebuild (package:Flutter/src/widgets/framework.dart:4343:5) #770 BuildOwner.buildScope (package:Flutter/src/widgets/framework.dart:2730:33) #771 AutomatedTestWidgetsFlutterBinding.drawFrame (package:Flutter_test/src/binding.dart:1088:18) #772 RendererBinding._handlePersistentFrameCallback (package:Flutter/src/rendering/binding.dart:302:5) #773 SchedulerBinding._invokeFrameCallback (package:Flutter/src/scheduler/binding.dart:1117:15) #774 SchedulerBinding.handleDrawFrame (package:Flutter/src/scheduler/binding.dart:1055:9) #775 AutomatedTestWidgetsFlutterBinding.pump。（包：Flutter_test/src/binding.dart:961:9） #778 TestAsyncUtils.guard (package:Flutter_test/src/test_async_utils.dart:72:41) #779 AutomatedTestWidgetsFlutterBinding.pump (package:Flutter_test/src/binding.dart:948:27) #780 WidgetTester.pumpWidget。（包：Flutter_test/src/widget_tester.dart:524:22） #783 TestAsyncUtils.guard (package:Flutter_test/src/test_async_utils.dart:72:41) #784 WidgetTester.pumpWidget（包：Flutter_test/src/widget_tester.dart:521:27）第785章主力。 (file:///Users/moseskarunia/Projects/arculus/test/src/widgets/arculus_onboarding_body_test.dart:67:18) 第786章主力。 (file:///Users/moseskarunia/Projects/arculus/test/src/widgets/arculus_onboarding_body_test.dart:66:52) #787 testWidgets..（包：Flutter_test/src/widget_tester.dart:146:29） #798 FakeAsync.flushMicrotasks (package:fake_async/fake_async.dart:193:32) #799 AutomatedTestWidgetsFlutterBinding.runTest。（包：Flutter_test/src/binding.dart:1189:17） #800 AutomatedTestWidgetsFlutterBinding.runTest。 (package:Flutter_test/src/binding.dart:1177:35) （从 dart:async 和 package:stack_trace)

图片提供者：ScrollAwareImageProvider() 图片配置：ImageConfiguration(bundle: PlatformAssetBundle#2377c(),devicePixelRatio: 3.0,locale: en_US,textDirection: TextDirection.ltr，平台：android) ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝测试失败。请参阅上面的异常日志。测试描述是：应该在底部显示按钮

✖ 应该在底部显示按钮退出 (1)

你知道我哪里做错了吗？它在实际运行中表现正确（在测试之外）

谢谢。

这是我的Flutter doctor -v

[✓] Flutter (Channel stable,1.22.6,on macOS 11.1 20C69 darwin-x64,语言环境en-ID） • Flutter 1.22.6 版，位于 /Users/moseskarunia/Development/Flutter • 框架修订版 9b2d32b605（5 天前），2021-01-22 14:36:39 -0800 • 引擎修订版 2f0af37152 • Dart 版本 2.10.5

[✓] Android 工具链 - 为 Android 设备开发（Android SDK 版本 29.0.2) • Android SDK 位于 /Users/moseskarunia/Development/Android/sdk • 平台 android-29，构建工具 29.0.2 • ANDROID_HOME = /Users/moseskarunia/Development/Android/sdk • Java 二进制文件位于：/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java 版 OpenJDK 运行时环境（构建 1.8.0_242-release-1644-b3-6915495） • 接受所有 Android 许可。

[✓] Xcode - 为 iOS 和 macOS 开发 (Xcode 12.4) • Xcode 位于 /Applications/Xcode.app/Contents/Developer • Xcode 12.4，构建版本 12D4e • CocoaPods 1.10.1 版

[!] Android Studio（4.1 版） • Android Studio 位于 /Applications/Android Studio.app/Contents ✗ 未安装 Flutter 插件；这增加了 Flutter 特定的功能。 ✗ 未安装 Dart 插件；这增加了 Dart 特定的功能。 • Java 版 OpenJDK 运行时环境（构建 1.8.0_242-release-1644-b3-6915495）

[✓] VS 代码（版本 1.52.1） • VS Code 位于 /Applications/Visual Studio Code.app/Contents • Flutter 扩展版本 3.18.1

[!] 连接的设备！没有可用的设备

！医生发现了 2 类问题。