Question

TestBed.overrideModule是否替换以前添加的提供者？

我有一个Component c1，它使用动态创建的组件c2。我读到我需要使用overrideModule在entryComponents中添加TestBed条目。

所以我做到了

TestBed.configureTestingModule({
  declarations: [ NewPracticeQuestionComponent,
  DialogBoxComponent,
    ShowErrorsComponent],
  imports:[ReactiveFormsModule,HttpClientTestingModule],
  providers:[WebToBackendInterfaceService,
    HelperService,
    AuthService,
    {provide:QuestionManagementService, useClass:MockQuestionManagementService}] //NOTE I HAVE A DIFFERENT PROVIDER HERE
});
TestBed.overrideModule(BrowserDynamicTestingModule, {
  set: {
    entryComponents: [DialogBoxComponent]/*DialogBoxComponent is created dynamically (imperatively), soit nee to be ddded in entryComponent*/
    }
  });
TestBed.compileComponents();

以上，我提供了MockQuestionManagementService作为QuestionManagementService的其他提供者。但是我注意到，在创建组件时，Angular创建了QuestionManagementService !!

要解决此问题，我必须明确致电TestBed.overrideProvider

    TestBed.configureTestingModule({
      declarations: [ NewPracticeQuestionComponent,
      DialogBoxComponent,
        ShowErrorsComponent],
      imports:[ReactiveFormsModule,HttpClientTestingModule],
      providers:[WebToBackendInterfaceService,
        HelperService,
        AuthService,
        {provide:QuestionManagementService, useClass:MockQuestionManagementService}]
    });
    TestBed.overrideModule(BrowserDynamicTestingModule, {
      set: {
        entryComponents: [DialogBoxComponent]/*DialogBoxComponent is created dynamically (imperatively), soit nee to be ddded in entryComponent*/
        }
      });
    TestBed.overrideProvider(QuestionManagementService,{useValue: new MockQuestionManagementService},); //THIS ADDED EXPLICITLY
    TestBed.compileComponents();
  }));

现在Angular添加了MockQuestionManagementService。我是否错误地使用了overrideModule或TestBed.overrideModule的预期行为？

Answer 1

问题不在于TestBed，而是我配置providers的方式。我在服务的@Injectable({ providedIn: 'root'})文件而不是模块的.ts中使用了.ts。因此，即使我将TestModule配置为使用提供的配置（{provide:QuestionManagementService, useClass:MockQuestionManagementService}），除非我通过调用{{ 1}}

尽管我仍然想知道为什么提供给QuestionManagementService的配置不起作用。不是查找从组件到模块再到根的依赖关系吗？

TestBed overlayModule方法似乎删除了以前添加的提供程序

1 个答案: