javascript - test - pruebas unitarias jasmine

No se puede leer la propiedad ''_getPortal'' de undefined en iónico 2 Unit testing

Question

Soy un principiante en la prueba de unidades iónicas. Seguí la documentación angular 2 ( https://angular.io/docs/ts/latest/guide/testing.html ) para probar mi aplicación iónica 2 con karma y jazmín.

Pero ahora estoy atrapado en un error llamado

''No se puede leer la propiedad'' _getPortal ''de undefined''

aquí está mi archivo LocationSearchModal.ts

import { Component } from ''@angular/core'';
import { NavController, ViewController } from ''ionic-angular'';
import { Location } from ''../../services/domain/Location'';
import { LocationService } from ''../../services/LocationService'';
import { LoadingController } from ''ionic-angular'';

@Component({
  selector: ''location-search-modal'',
  templateUrl: ''location-search-modal.html''
})
export class LocationSearchModal {
  locationList: Array<Location> = new Array<Location>();
  selectedLocation: number;
  temp: any = "test";

  constructor(public navCtrl: NavController, public locationService: LocationService, public viewController: ViewController, public loadingController: LoadingController) {
    this.filterLocationsForString();
  }

  filterLocations(event: any): void {
    const searchString: string = event.target.value;
    this.filterLocationsForString(searchString);
    console.log(this.filterLocationsForString(searchString));
  }

  filterLocationsForString(searchString?: string) {
    let loader = this.loadingController.create({
      content: "loading"
    });
    loader.present();
    this.locationService.getLocationsForLikeSearchString(searchString)
      .subscribe((result) => {
        loader.dismissAll();
        this.locationList = result
      });
    console.log(this.locationList);
  }

  closeLocationSearch() {
    this.locationService.getLocationById(this.selectedLocation)
      .subscribe((location) => this.viewController.dismiss(location[0]));
  }

}

y usé el servicio llamado locationService.ts allí y este es ese servicio

import { Injectable } from ''@angular/core'';
import { Location } from ''./domain/Location'';

import { DatabaseAccessor } from  ''../database/DatabaseAccessor'';
import { Observable } from ''rxjs/Rx'';

@Injectable()
export class LocationService {
  locationList:Array<Location> = new Array<Location>();

  constructor(public databaseAccessor: DatabaseAccessor) {}

  getLocationsForLikeSearchString(searchString: string) : Observable<Array<Location>> {
    const searchValue = (searchString == null) ? ''%'' : searchString.trim() + ''%'';
    return <Observable<Array<Location>>> Observable.fromPromise(this.databaseAccessor.runSelectQuery(Location, new Location(), ''WHERE name LIKE ?'', [searchValue]));
  }

  getLocationById(id: number): Observable<Location> {
    return <Observable<Location>> Observable.fromPromise(this.databaseAccessor.runSelectQuery(Location, new Location(), ''WHERE id = ?'', [id]));
  }

  saveLocations(locations: Array<Location>){
    this.databaseAccessor.runInsertBatchQuery(Location.prototype, locations);
  }


}

Finalmente, escribí un archivo spec.ts para pruebas unitarias y aquí está eso,

import { ComponentFixture, async } from ''@angular/core/testing'';
import { LocationSearchModal } from ''./LocationSearchModal'';
import { LocationService } from ''../../services/LocationService'';
import { TestUtils } from ''../../test'';
import { TestBed } from ''@angular/core/testing'';
import { App, NavController, Platform, Config, Keyboard, Form, IonicModule, GestureController, ViewController, LoadingController }  from ''ionic-angular'';
import { ConfigMock } from ''../../mocks'';
import { TranslateModule } from ''ng2-translate'';
import { DatabaseAccessor } from  ''../../database/DatabaseAccessor'';

let comp: LocationSearchModal;
let fixture: ComponentFixture<LocationSearchModal>;
let instance: any = null;

describe(''LocationSearchModal'', () => {

  beforeEach(async(() => {

    TestBed.configureTestingModule({
      declarations: [LocationSearchModal], // declare the test component
      providers: [App, Platform, Form, Keyboard, NavController, GestureController, LoadingController, LocationService, DatabaseAccessor,
        { provide: ViewController, useClass: class { ViewController = jasmine.createSpy("viewController"); } },
        { provide: Config, useClass: ConfigMock },
      ],
      imports: [
        IonicModule,
        TranslateModule.forRoot(),
      ],
    });
    fixture = TestBed.createComponent(LocationSearchModal);
    comp = fixture.componentInstance;
  }));

  console.log(comp);
  it(''Testing Location Component'', () => {
    expect(comp.temp).toBe(''test'');
  })
});

cuando estoy corriendo, el siguiente error proviene de la terminal. (La configuración de prueba de mi unidad es correcta y la probé con otro archivo .spec.ts simple)

el error

SUMMARY:
✔ 1 test completed
✖ 1 test failed

FAILED TESTS:
  LocationSearchModal
    ✖ Testing Location Component
      Chrome 54.0.2840 (Linux 0.0.0)
    Failed: Error in ./LocationSearchModal class LocationSearchModal_Host - inline template:0:0 caused by: Cannot read property ''_getPortal'' of undefined
    TypeError: Cannot read property ''_getPortal'' of undefined
        at App.present (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/~/ionic-angular/components/app/app.js:78:0 <- src/test.ts:2091:35)
        at Loading.present (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/~/ionic-angular/components/loading/loading.js:31:0 <- src/test.ts:38779:26)
        at LocationSearchModal.filterLocationsForString (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/src/pages/location-search/LocationSearchModal.ts:9:4184 <- src/test.ts:18993:4170)
        at new LocationSearchModal (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/src/pages/location-search/LocationSearchModal.ts:9:3407 <- src/test.ts:18993:3391)
        at new Wrapper_LocationSearchModal (/DynamicTestModule/LocationSearchModal/wrapper.ngfactory.js:7:18)
        at _View_LocationSearchModal_Host0.createInternal (/DynamicTestModule/LocationSearchModal/host.ngfactory.js:16:35)
        at _View_LocationSearchModal_Host0.AppView.create (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/~/@angular/core/src/linker/view.js:84:0 <- src/test.ts:52350:21)
        at _View_LocationSearchModal_Host0.DebugAppView.create (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/~/@angular/core/src/linker/view.js:294:0 <- src/test.ts:52560:44)
        at ComponentFactory.create (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/~/@angular/core/src/linker/component_factory.js:152:0 <- src/test.ts:32035:36)
        at initComponent (webpack:/media/dilanka/Stuff/CODE%20BASE/Inspection/Unit%20Testing/Inspection-Rewrite/~/@angular/core/bundles/core-testing.umd.js:855:0 <- src/test.ts:7416:53)

Answer 1

Resolví este problema finalmente. Usé un simulacro y definí los métodos requeridos en ese simulacro. Entonces funciona :)
aquí hay un ejemplo para un simulacro.

export class ViewControllerMock {
  public _setHeader(): any { return {} };
  public _setNavbar(): any { return {} };
  public _setIONContent(): any { return {} };
  public _setIONContentRef(): any { return {} };
}

entonces tiene que importar ese simulacro en su archivo .spec.ts la siguiente manera

import {ViewControllerMock} from ''../../mocks'';

entonces tiene que definir ese simulacro en sus proveedores en el archivo spec.ts la siguiente manera

providers: [{ provide: ViewController, useClass: ViewControllerMock}],

Answer 2

LoadingController si el problema es al usar LoadingController

export class LoadingControllerMock {
    _getPortal(): any { return {} };
    create(options?: any) { 
        return new LoadingMock()
    };
}

class LoadingMock {
    present() { };
    dismiss() { };
    dismissAll() { };
}

Importa el simulacro y el real desde cualquier lugar

import { LoadingController } from ''ionic-angular'';

import { LoadingControllerMock } from ''../../../../test-config/mocks-ionic'';

Sustituir

providers: [ 
    { provide: LoadingController, useClass: LoadingControllerMock }
]