[英]Unit testing services in Angular
I am new to unit testing in Angular.我是 Angular 单元测试的新手。 Is there any way other than this to write unit tests for this particular function?
除了这个,还有什么方法可以为这个特定的函数编写单元测试吗? Thank you!
谢谢!
list-user.component.ts列表-user.component.ts
constructor(private auth: AuthenticationService, private router: Router, private dialog: MatDialog) { }
fetchOfficeInfoByManager() {
this.auth.getUserbyLM().subscribe((data: User[]) => {
this.usersource = new MatTableDataSource(data);
}
ngOnInit() {`
this.fetchOfficeInfoByManager();
}
list-user.component.spec.ts列表-user.component.spec.ts
import { ListUserComponent } from './list-user.component';
import { AuthenticationService } from '../../shared/services/authentication.service';
import { Observable } from 'rxjs';
import { from } from 'rxjs'
describe ('ListUserComponent', () => {
let component: ListUserComponent;
let service: AuthenticationService;
beforeEach(() => {
service = new AuthenticationService(null, null);
component = new ListUserComponent(service, null, null);
});
it('should get employees according to line manager', () => {
let data = [];
spyOn(service, 'getUserbyLM').and.callFake(() => {
return from([ data ]);
});
component.fetchOfficeInfoByManager();
expect(component.data).toBeTruthy();
});
});
Yes, you can do :是的,你可以这样做:
class MockAuthService{
getUserbyLM(){
return
of({
name: 'User',
id: 'id'
})
}
}
describe('ListUserComponent',()=>{
beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [modules......],
providers: [{ provide: AuthService, useClass: MockAuthService }]
}).compileComponents();
}));
it('should have usersource defined when fetchOfficeInfoByManager() is called', () => {
component.fetchOfficeInfoByManager();
expect(component.usersource).toBeDefined();
expect(component.usersource.name).toBe('User');
// and so on......
});
})
You need to add some import
for rxjs for using of()
.您需要为 rxjs 添加一些
import
以使用of()
。 I hope you can get some idea about how to test that function from this example我希望你能从这个例子中得到一些关于如何测试这个函数的想法
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