flutter-test - 如何在小部件测试中使用 get_it(flutter 依赖注入(inject))？

Question

当我在项目中使用依赖注入(inject)时，我的小部件测试失败。
我的错误如下:

Testing started at 10:07 AM ...
C:\src\flutter\bin\flutter.bat --no-color test --machine --plain-name "Exist FloatingActionButton" test\features\announcement\presentation\widgets_test\announcement_widget_test.dart
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞══════════════════════'═════════════════════════════════════
The following assertion was thrown building _BodyBuilder:
No type AnnouncementBloc is registered inside GetIt.
Did you forget to pass an instance name?
(Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;did you
forget to register it?)
'package:get_it/get_it_impl.dart':
Failed assertion: line 251 pos 14: 'instanceFactory != null'

The relevant error-causing widget was:
Scaffold
file:///C:/Projects/niaz-flutter/lib/features/announcement/presentation/pages/announcements_page.dart:15:12

When the exception was thrown, this was the stack:
#2 _GetItImplementation._findFactoryByNameOrType (package:get_it/get_it_impl.dart:251:14)
#3 _GetItImplementation.get (package:get_it/get_it_impl.dart:263:27)
#4 _GetItImplementation.call (package:get_it/get_it_impl.dart:288:12)
#5 new _AnnouncementsWidgetState (package:niaz/features/announcement/presentation/widgets/announcements_widget.dart:22:19)
#6 AnnouncementsWidget.createState (package:niaz/features/announcement/presentation/widgets/announcements_widget.dart:18:46)
#7 new StatefulElement (package:flutter/src/widgets/framework.dart:4600:25)
#8 StatefulWidget.createElement (package:flutter/src/widgets/framework.dart:896:38)
... Normal element mounting (19 frames)
#27 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3455:14)
#28 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5956:32)
... Normal element mounting (193 frames)
#221 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3455:14)
#222 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5956:32)
... Normal element mounting (255 frames)
#477 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3455:14)
#478 Element.updateChild (package:flutter/src/widgets/framework.dart:3220:20)
#479 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:1132:16)
#480 RenderObjectToWidgetElement.update (package:flutter/src/widgets/binding.dart:1110:5)
#481 RenderObjectToWidgetElement.performRebuild (package:flutter/src/widgets/binding.dart:1124:7)
#482 Element.rebuild (package:flutter/src/widgets/framework.dart:4227:5)
#483 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2632:33)
#484 AutomatedTestWidgetsFlutterBinding.drawFrame (package:flutter_test/src/binding.dart:1016:18)
#485 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:284:5)
#486 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1113:15)
#487 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1052:9)
#488 AutomatedTestWidgetsFlutterBinding.pump. (package:flutter_test/src/binding.dart:889:9)
#491 TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:72:41)
#492 AutomatedTestWidgetsFlutterBinding.pump (package:flutter_test/src/binding.dart:876:27)
#493 WidgetTester.pumpWidget. (package:flutter_test/src/widget_tester.dart:462:22)
#496 TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:72:41)
#497 WidgetTester.pumpWidget (package:flutter_test/src/widget_tester.dart:459:27)
#498 main. (file:///C:/Projects/niaz-flutter/test/features/announcement/presentation/widgets_test/announcement_widget_test.dart:15:18)
#499 main. (file:///C:/Projects/niaz-flutter/test/features/announcement/presentation/widgets_test/announcement_widget_test.dart:14:45)
#500 testWidgets.. (package:flutter_test/src/widget_tester.dart:144:29)
#511 FakeAsync.flushMicrotasks (package:fake_async/fake_async.dart:192:32)
#512 AutomatedTestWidgetsFlutterBinding.runTest. (package:flutter_test/src/binding.dart:1109:17)
#513 AutomatedTestWidgetsFlutterBinding.runTest. (package:flutter_test/src/binding.dart:1097:35)
(elided 31 frames from class _AssertionError, dart:async, and package:stack_trace)

════════════════════════════════════════════════════════════════════════════════════════════════════

Test failed. See exception logs above.

测试描述为:Exist FloatingActionButton

Answer 1

这取决于您最初如何设置 get_it在你的项目中。
为了解决我的设置问题，我简单地调用了在 setUpAll 中注册我的依赖项的方法。测试文件的方法。
所以我在 lib 文件夹的根目录中有一个文件，它注册了我的依赖项:

final getIt = GetIt.instance;

void setupDependencyInjection() {
  GetIt.instance.registerSingleton<SomeServiceInterface>(SomeService());
}
 

setupDependencyInjection方法在 runApp 之前调用main.dart 文件中的 app 方法。
要进行测试，您只需在 setUpAll 中调用相同的方法即可。测试文件的方法。

void main() {
  setUpAll(() {
    setupDependencyInjection();
  });


  testWidgets('Some test description', (WidgetTester tester) async {

    final widget = TestWidget();

    await tester.pumpWidget(widget);
  });
}