角度组件测试类型错误：无法读取未定义的属性'subscribe'

Question

运行ng测试时收到此错误消息：

Chrome 80.0.3987 (Windows 10.0.0) ProfileComponent should be created FAILED
TypeError: Cannot read property 'subscribe' of undefined
error properties: Object({ ngDebugContext: DebugContext_({ view: Object({ def: Object({ factory: Function, nodeFlags: 33800193, rootNodeFlags: 33554433, nodeMatchedQueries: 0, flags: 0, nodes: [ Object({
nodeIndex: 0, parent: null, renderParent: null, bindingIndex: 0, outputIndex: 0, checkIndex: 0, flags: 33554433, childFlags: 245760, directChildFlags: 245760, childMatchedQueries: 0, matchedQueries: Object({  }
), matchedQueryIds: 0, references: Object({  }), ngContentIndex: null, childCount: 1, bindings: [  ], bindingFlags: 0, outputs: [  ], element: Object({ ns: '', name: 'app-profile', attrs: [  ], template: null, c
omponentProvider: Object({ nodeIndex: 1, parent: <circular reference: Object>, renderParent: <circular reference: Object>, bindingIndex: 0, outputIndex: 0, checkIndex: 1, flags: 245760, childFlags: 0, directChil
dFlags: 0, childMatchedQueries: 0, matchedQueries: Object, matchedQueryIds: 0, references: Object, ngContentIndex: -1, childCount: 0, bindings: Array, bindingFlags: 0, outputs: Array ...
at <Jasmine>
at new CertificationService (http://localhost:9876/_karma_webpack_/src/app/components/cts/services/certification.service.ts:66:3)
at _createClass (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm2015/core.js:30472:1)
at _createProviderInstance (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm2015/core.js:30426:1)
...

我的测试：

describe('ProfileComponent', () => {
let component: ProfileComponent;
let fixture: ComponentFixture<ProfileComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [ReactiveFormsModule, FormsModule,HttpClientModule ],
declarations: [ ProfileComponent,CertificationsComponent ,NumericOnlyDirective ],
providers: [
PrService,
UsService,
InService,
CertificationService,
HttpClient,
CookieService
]
})
.compileComponents();
}));
it('should be created', done=>inject([UsService,HttpClient,CookieService,PrService,CertificationService],
async (usService: UsService,http: HttpClient, cookieService: CookieService,prService: PrService,certificationService:CertificationService,inService: InService) => {
const response = {};
const a: BehaviorSubject<any> = new BehaviorSubject(response);
spyOn(usService, 'getObsU').and.returnValue(a.asObservable());
spyOn(cookieService, 'get').and.returnValue('aasdf');
spyOn(prService, 'getResponseObs').and.returnValue(a.asObservable());
spyOn(prService, 'getPrObs').and.returnValue(a.asObservable());
spyOn(inService, 'getIn').and.returnValue(a.asObservable());
fixture = TestBed.createComponent(ProfileComponent);
component = fixture.componentInstance;
fixture.detectChanges();
expect(component).toBeTruthy();
done();
})());
});

这是我的组件组件的init和构造函数：

constructor(
private prService: PrService,
private inService: InService,
private certificationService: CertificationService,
private usService: UsService
) {
this.prService.getPrObs().subscribe(p=> {
this.p= p;
}
});
this.prService.getResponseObs().subscribe(apiResponse => {
this.serviceResponse = apiResponse
});
this.inService.getIn().subscribe(reasons => {
this.reasons = reasons
});
this.usService.getObsU().subscribe( u => {
this.u = u;
});
}
ngOnInit() {
this.formErrors = [];
this.showCertifications = false;
if (!this.currentProfile) {
this.formSsn = '';
this.resetForm();
} else {
this.setProfile(this.currentProfile);
}
}

我试过使用mock服务，但它会给我同样的错误/其他错误，说方法不存在。此组件还有一个子组件CertificatesComponent。我做这个测试只是为了让默认组件的创建成功。它显示了4次错误，其中两次针对概要文件组件，两次针对认证组件。他们都说在新的认证服务。

Answer 1

所以我使用了ngentest来自动生成一个工作测试，它成功了。在这里：

所有模拟服务都在顶部，看起来像这样：

@Injectable()
class MockUsService {
getObsU= function() {
return observableOf({});
};
}

其余：

describe('ProfileComponent', () => {
let fixture;
let component;
const matDialogRefStub = {};
beforeEach(() => {
TestBed.configureTestingModule({
imports: [ FormsModule, ReactiveFormsModule,OverlayModule,MatDialogModule  ],
declarations: [
ProfileComponent,
],
schemas: [ CUSTOM_ELEMENTS_SCHEMA, NO_ERRORS_SCHEMA ],
providers: [
{ provide: PrService, useClass: MockPrService },
{ provide: InService, useClass: MockInService },
{ provide: CertificationService, useClass: MockCertificationService },
{ provide: UsService, useClass: MockUsService },
{provide: MatDialogRef, useValue: matDialogRefStub},
MatDialog
]
}).overrideComponent(ProfileComponent, {
}).compileComponents();
fixture = TestBed.createComponent(ProfileComponent);
component = fixture.debugElement.componentInstance;
});
afterEach(() => {
component.ngOnDestroy = function() {};
fixture.destroy();
});
it('should run #constructor()', async () => {
expect(component).toBeTruthy();
});
it('should run #ngOnInit()', async () => {
component.ngOnInit();
});