Htykuut

I'm trying to write Unit tests for the first time. Up to now I was able to write tests for "normal"/intern services. Now I'm stuck with a more complex Service:

@Injectable()

export class BaseToolsService {



vehicles: Array<Vehicle>;

tools: BehaviorSubject<Array<Tool>> = new BehaviorSubject<Array<Tool>>(undefined);

noBaseTools: BehaviorSubject<Array<Tool>> = new BehaviorSubject<Array<Tool>>(undefined);

vehiclesWithBaseTools: BehaviorSubject<Array<VehicleBaseToolsModel>> = new BehaviorSubject<Array<VehicleBaseToolsModel>>(undefined);



constructor(private readonly toolService: ToolService,

            private readonly vehicleService: VehicleService,

            private readonly notificationService: NotificationService) {

    forkJoin([this.toolService.getTools('Asset,ToolType'),

        this.vehicleService.getVehicles('Asset,VehicleModel')]).subscribe(results => {

        this.tools.next(results[0]);

        this.vehicles = results[1];

        this.filterToolsAndConvertVehicles();

    });

} 



...

My setup of the Unit test so far is:

import {BaseToolsService} from './base-tools.service';

import {ToolService} from '../../../../core/services/api/tool.service';

import {VehicleService} from '../../../../core/services/api/vehicle.service';

import {NotificationService} from '../../../../core/services/intern/notification/notification.service';

import {async, getTestBed, TestBed} from '@angular/core/testing';



    describe('Service: BaseToolsService', () => {



        let service: BaseToolsService;



        beforeEach(async(() => {

            TestBed.configureTestingModule({

                providers: [

                    ToolService,

                    VehicleService,

                    NotificationService,

                    BaseToolsService

                ]

            });

            const testBed = getTestBed();

            service = testBed.get(BaseToolsService);

        }));



    ...

    // Some Tests

The Problem is that the Services ToolService and VehicleService try to get a server respond. Since they are built in the BaseToolsService I don't know how to mock the server request/backend or how to mock the required data itself and prevent the services to reach out for the server. When I run the test it of course fails with the error Failed: Http failure response for (unknown url): 0 Unknown Error.

Is there a way I can mock the server respond which is one level deeper than the service is i want to test? Or is the Problem somewhere else? (Since I'm new to Unit Tests I doubt I did everything correct)