Angular 18+ Guard testing

angular-18-guard-testing.ts

export const loggedInGuard: CanActivateFn = () => {
  const jwtService = inject(JwtService);
 
  return !!jwtService.getToken();
};
                            
describe('loggedInGuard', () => {
  it('should return true', waitForAsync(async () => {
    TestBed.configureTestingModule({
      providers: [
        {
          provide: JwtService,
          useValue: { getToken: () => true },
        },
        {
          provide: ActivatedRouteSnapshot,
          useValue: {},
        },
        {
          provide: RouterStateSnapshot,
          useValue: {},
        },
      ],
    });

    TestBed.runInInjectionContext(() => {
      const route = inject(ActivatedRouteSnapshot);
      const state = inject(RouterStateSnapshot);

      // loggedInGuard function must be called from an injection context
      const result = loggedInGuard(route, state);
      expect(result).toBeTruthy();
    });
  }));
});