I'm trying to set up unit tests for a sample Angular 2 app using AngularFire 2 auth, the component is fairly simple:
import { Component } from '@angular/core';
import { AngularFire, AuthProviders } from 'angularfire2';
@Component({
moduleId: module.id,
selector: 'app-root',
templateUrl: 'app.component.html',
styleUrls: ['app.component.css']
})
export class AppComponent {
isLoggedIn: boolean;
constructor(public af: AngularFire) {
this.af.auth.subscribe(auth => {
if (auth) {
this.isLoggedIn = true;
} else {
this.isLoggedIn = false;
}
});
}
loginWithFacebook() {
this.af.auth.login({
provider: AuthProviders.Facebook
});
}
logout() {
this.af.auth.logout();
}
}
All I'm doing is wrapping around the login and logout methods in AngularFire so I was thinking about using a mock to check if the methods were called but I'm not sure where to start, I tried doing the following in my spec file:
import { provide } from '@angular/core';
import { AngularFire } from 'angularfire2';
import {
beforeEach, beforeEachProviders,
describe, xdescribe,
expect, it, xit,
async, inject
} from '@angular/core/testing';
import { AppComponent } from './app.component';
spyOn(AngularFire, 'auth');
beforeEachProviders(() => [
AppComponent,
AngularFire
]);
describe('App Component', () => {
it('should create the app',
inject([AppComponent], (app: AppComponent) => {
expect(app).toBeTruthy();
})
);
it('should log user in',
inject([AppComponent], (app: AppComponent) => {
expect(app.fb.auth.login).toHaveBeenCalled();
})
);
it('should log user out',
inject([AppComponent], (app: AppComponent) => {
expect(app.fb.auth.logout).toHaveBeenCalled();
})
);
});
However I'm not sure how to mock the login and logout methods since they're part of the auth property, is there a way to mock auth and also the returning login and logout methods?
In this snippet:
beforeEach(() => addProviders([
AppComponent,
AngularFire
]);
You set (or override) the providers that will be used in your test.
That being said, you can create a different class, a mock if you will, and, using the { provide: originalClass, useClass: fakeClass } notation, provide it instead of the AngularFire actual class.
Something like this:
class AngularFireAuthMock extends AngularFireAuth { // added this class
public login() { ... }
public logout() { ... }
}
class AngularFireMock extends AngularFire { // added this class
public auth: AngularFireAuthMock;
}
beforeEach(() => addProviders([
AppComponent,
{ provide: AngularFire, useClass: AngularFireMock } // changed this line
]);
And the AngularFires in your tests will be AngularFireMocks.
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