我在做Angular单元测试时遇到了一个错误。我正在尝试测试创建组件请参阅下面的错误文件,让我知道为什么我面对它,我还导入了与提供程序相关的服务和模块的导入。
下面的错误是Karma在单元测试时显示的。我想我漏掉了什么
TypeError: Cannot read property 'userName' of undefined
at Object.eval [as updateRenderer] (ng:///DynamicTestModule/ProfilePersonalInformationComponent.ngfactory.js:72:38)
at Object.debugUpdateRenderer [as updateRenderer] (webpack:///./node_modules/@angular/core/esm5/core.js?:14909:21)
at checkAndUpdateView (webpack:///./node_modules/@angular/core/esm5/core.js?:14023:14)
at callViewAction (webpack:///./node_modules/@angular/core/esm5/core.js?:14369:21)
at execEmbeddedViewsAction (webpack:///./node_modules/@angular/core/esm5/core.js?:14327:17)
at checkAndUpdateView (webpack:///./node_modules/@angular/core/esm5/core.js?:14019:5)
at callViewAction (webpack:///./node_modules/@angular/core/esm5/core.js?:14369:21)
at execEmbeddedViewsAction (webpack:///./node_modules/@angular/core/esm5/core.js?:14327:17)
at checkAndUpdateView (webpack:///./node_modules/@angular/core/esm5/core.js?:14019:5)
at callViewAction (webpack:///./node_modules/@angular/core/esm5/core.js?:14369:21)
为了解决上述错误,我创建了PerosnalInfoStub类,但它不起作用。
component.spec.ts文件
describe('ProfilePersonalInformationComponent', () => {
let component: ProfilePersonalInformationComponent;
let fixture: ComponentFixture<ProfilePersonalInformationComponent>;
let personalInfo : PersonalInfo;
class PersonalInfoStub{
personalInfo: Subject<any[]> = new Subject<any[]>();
}
beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [FormsModule, SharedModule, HttpModule, BrowserModule],
declarations: [ ProfilePersonalInformationComponent ],
providers: [
{
provide: PersonalInfo, useClass: PersonalInfo
},
{
provide: NotificationService, useClass: NotificationService
},
{
provide: LoginService, useClass: LoginService
},
{
provide: ConfigService, useClass: ConfigService
}
],
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(ProfilePersonalInformationComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
personal-info.ts
export class PersonalInfo {
userName: string;
}
组件的类文件
ProfilePersonalInformationComponent implements OnInit {
@Input() personalInfo: PersonalInfo;
@Input() loadingData;
savingData: boolean;
passwordHelpTextArray: string[];
passwordHelpText: string;
formErrors: any = {
username: {
error: '',
errorMessage: ''
},
currentPassword: {
error: '',
errorMessage: ''
},
newPassword: {
error: '',
errorMessage: ''
},
verifyNewPassword: {
error: '',
errorMessage: ''
}
};
updatedUsername: string = '';
existingPassword: string = '';
newPassword: string = '';
reEnterNewPassword: string = '';
constructor(private personalInfoService: PersonalInformationService,
private notificationService: NotificationService) { }
ngOnInit(): void {
this.populateInfo();
}
populateInfo() {
setTimeout(() => {
if (this.loadingData === false) {
this.updatedUsername = this.personalInfo.userName;
} else {
this.populateInfo();
}
}, 500);
}
用户名的Html代码
<div class="col-sm-2">
<h3>Username</h3>
<p>{{personalInfo.userName}}</p>
</div>
<div class="col-sm-2">
<h3>Password</h3>
<p>********</p>
</div>
https://stackoverflow.com/questions/50728302
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