How to unit-test canActivate guard method of angular2 using Jasmine?

Question

Sorry for asking this type of question. But I'm not able to find any blog or youtube tutorials on writing the canActivate guard file testing. Nor in the official documentation there is anything mentioned.

any help will be much appreciated.

Answer 1

since no one answered my question, so I'm pasting my code snippet for the reference to help people who might get this situation.

sampleLoggedIn.guard.ts

import {Injectable} from '@angular/core';
import {Router, CanActivate} from '@angular/router';
import {StorageService} from '../storage.service';

@Injectable()
export class LoggedInGuard implements CanActivate {
    constructor(private router: Router, private storageService: StorageService) {
    }

    /**Overriding canActivate to guard routes
     *
     * This method returns true if the user is not logged in
     * @returns {boolean}
     */
    canActivate() {
        if (this.storageService.isLoggedIn) {
            return true;
        } else {
            this.router.navigate(['home']);
            return false;
        }
    }
}

sampleLoggedIn.guard.spec.ts

import {TestBed, async} from '@angular/core/testing';
import {FormsModule} from '@angular/forms';
import {HttpModule} from '@angular/http';
import {CommonModule} from '@angular/common';
import 'rxjs/Rx';
import 'rxjs/add/observable/throw';
import {Router} from '@angular/router';
import 'rxjs/add/operator/map';
import {LoggedInGuard} from './loggedin.guard';
import {StorageService} from '../storage.service';
import {CookieService} from 'angular2-cookie/core';

describe('Logged in guard should', () => {
    let loggedInGuard: LoggedInGuard;
    let storageService: StorageService;
    let router = {
        navigate: jasmine.createSpy('navigate')
    };

    // async beforeEach
    beforeEach(async(() => {
        TestBed.configureTestingModule({
            imports: [FormsModule, CommonModule, HttpModule],
            providers: [LoggedInGuard, StorageService, CookieService,
                {provide: Router, useValue: router}
            ]
        })
            .compileComponents(); // compile template and css
    }));

    // synchronous beforeEach
    beforeEach(() => {
        loggedInGuard = TestBed.get(LoggedInGuard);
        storageService = TestBed.get(StorageService);
    });

    it('be able to hit route when user is logged in', () => {
        storageService.isLoggedIn = true;
        expect(loggedInGuard.canActivate()).toBe(true);
    });

    it('not be able to hit route when user is not logged in', () => {
        storageService.isLoggedIn = false;
        expect(loggedInGuard.canActivate()).toBe(false);
    });
});