Angular

Chapter 69: unit testing
Section 69.1: Basic unit test
component file
@Component({
selector: 'example-test-compnent',
template: '
{{user.name}}
{{user.fname}}
{{user.email}}
'
})
export class ExampleTestComponent implements OnInit{
let user :User = null;
ngOnInit(): void {
this.user.name = 'name';
this.user.fname= 'fname';
this.user.email= 'email';
}
}
Test file
describe('Example unit test component', () => {
let component: ExampleTestComponent ;
let fixture: ComponentFixture;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ExampleTestComponent]
}).compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(ExampleTestComponent );
component = fixture.componentInstance;
fixture.detectChanges();
});
it('ngOnInit should change user object values', () => {
expect(component.user).toBeNull(); // check that user is null on initialize
component.ngOnInit(); // run ngOnInit
expect(component.user.name).toEqual('name');
expect(component.user.fname).toEqual('fname');
expect(component.user.email).toEqual('email');
});
});
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