I encountered an issue while conducting unit testing in Angular. I am attempting to test the creation of a component. Please refer to the error below and help me understand why this problem is occurring. I have also imported the necessary services related to providers and module imports.
The error displayed below is from Karma during unit testing. It appears that I may have overlooked something.
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)
To resolve the above error, I attempted creating a PersonalInfoStub class but it did not rectify the issue.
Here is the content of the component.spec.ts file:
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();
});
This is the personal-info.ts file:
export class PersonalInfo {
userName: string;
}
Below is part of the class file for the component:
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);
}
HTML code snippet displaying User Name:
<div class="col-sm-2">
<h3>Username</h3>
<p>{{personalInfo.userName}}</p>
</div>
<div class="col-sm-2">
<h3>Password</h3>
<p>********</p>
</div>