错误角度测试使用Karma：未捕获（承诺）：错误：没有提供者SessionUtil

我想为我的Angular应用程序编写一些测试。我写我的茉莉/噶/ PhantomJS测试，我不断收到这让我所有的测试失败，这是Error: No provider for SessionUtil!错误角度测试使用Karma：未捕获（承诺）：错误：没有提供者SessionUtil

SessionUtil是一个实用工具类/服务，它拥有众多的公共方法是错误的。在我main.component.ts文件我把它注射到我的construtor像这样

constructor(@Inject(SessionUtil) private sessionUtil: SessionUtil)

，这是我的测试文件（不是全部，只是这里我宣布一切，我的导入服务等）

describe('MainComponent',() => { 
    let componentFixture: ComponentFixture<MainComponent>; 
    let instance: any; 
    let element: any; 
    let sessionUtil: SessionUtil; 
    let spyLocalizationsService; 
    const firstLanguage = 'en-US'; 
    const secondLanguage = 'de-DE'; 
    const unknownLanguage = 'xx-XX'; 

    beforeEach(async(() => { 

    spyLocalizationsService = sinon.createStubInstance(LocalizationsService); 
    spyLocalizationsService.changeLanguage.withArgs(firstLanguage, sinon.match.any, sinon.match.any).callsArg(1); 
    spyLocalizationsService.changeLanguage.withArgs(secondLanguage, sinon.match.any, sinon.match.any).callsArg(1); 
    spyLocalizationsService.changeLanguage.withArgs(unknownLanguage, sinon.match.any, sinon.match.any).callsArg(2); 
    spyLocalizationsService.getSupportedLanguages.returns([firstLanguage, secondLanguage]); 

    (sinon.stub(spyLocalizationsService, 'currentLanguage') as any).get(() => firstLanguage); 

    // Allows overriding default providers, directives, pipes 
    TestBed.configureTestingModule({ 
     imports: [ 
     RouterTestingModule.withRoutes([ 
      // some Paths 
     ]), 
     TranslateI18NextTestingModule.forRoot(), 
     AuthTestingModule.forRoot(), 
     NoopAnimationsModule, 
     MaterialModule 
     ], 
     declarations: [ 
     MainComponent, 
     DummyComponent 
     ], 
     schemas: 
     [CUSTOM_ELEMENTS_SCHEMA], 
     providers: 
     [{provide: LocalizationsService, useValue: spyLocalizationsService}, 
     {provide: MATERIAL_COMPATIBILITY_MODE, useValue: true}] 
    }).compileComponents().then(() => { 
     componentFixture = TestBed.createComponent(MainComponent); 
     element = componentFixture.nativeElement; 
     instance = componentFixture.componentInstance; // BannerComponent test instance 
     sessionUtil = componentFixture.debugElement.injector.get(SessionUtil); 
    }); 
    })); 

    const isAuthenticated =() => Promise.resolve({ 
    isAuthenticated: true, 
    username: 'Max Musterman' 
    }); 

describe('on init',() => { 

beforeEach(async(() => { 
    sinon.stub(sessionUtil, 'isAuthenticated').returns(isAuthenticated()); 
}));

当我运行我的测试时，我只是得到以下错误，没有运行我的测试，Uncaught (in promise): Error: No provider for SessionUtil!我显然做错了什么。我试图在TestBed.configureTestingModule对象providers数组中注入SessionUtil，但这给了我很多问题。任何人都可以看到我如何注入这不正确？

任何意见将不胜感激！

来源

2017-10-10 Mark Sandman

{provide: SessionUtil, useValue: sessionUtil}

而且你需要启动sessionUtil与存根

来源

2017-10-10 15:05:04 Alexander

错误角度测试使用Karma：未捕获（承诺）：错误：没有提供者SessionUtil

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