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[英]How to Inject a Service with Parameterized constructor to a Component - Angular
[英]How to test component with a @Inject text in the constructor in Angular
角度6,我在組件的構造函數中聲明了一些注入的變量,但是當我運行ng test
時,我不知道如何在單元測試文件中配置注入的值,並且它給出以下錯誤:
錯誤:StaticInjectorError(DynamicTestModule)[標題]:
StaticInjectorError(平台:核心)[標題]:NullInjectorError:沒有標題提供者!
//我的組件
export class ConfirmModalComponent extends BaseModal implements OnInit {
choosedCandidates: Array<any> = [];
constructor(
@Inject('title') public title,//injected variable
protected modalService: ModalService
) {
super();
}
ngOnInit() {
}
....
}
//spec file of my component
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ DelInterviewerConfirmModalComponent ],
imports: [ CheckboxModule, TranslateModule ],
providers: [
{ provide: title, useValue: 'modal title' },
ModalService,
RequisitionDetailService ],
schemas: [ CUSTOM_ELEMENTS_SCHEMA, NO_ERRORS_SCHEMA ],
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(DelInterviewerConfirmModalComponent);
component = fixture.componentInstance;
component.title = "test";
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
我想知道是否有人遇到相同的問題,以及如何解決錯誤,請先感謝。
日期,數字和字符串之類的值必須包裝在Injection Token中 。
1 .:創建注入令牌:
export const TITLE = new InjectionToken<string>('title');
2 .:像現在一樣注入:
constructor(@Inject(TITLE) private title: string)
3 .:在您的測試中,使用InjectionToken模擬它:
TestBed.configureTestingModule({
declarations: [ DelInterviewerConfirmModalComponent ],
imports: [ CheckboxModule, TranslateModule ],
providers: [
{ provide: TITLE, useValue: 'modal title' },
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