Error: No provider for DeepLinker!

Ionic Framework ionic-v3
1

I am testing my Ionic 2 application . I was able to run tests for my services . But I am unable to test my components. I am using this tutoral for unit testing. I have made changes according to the changes in his github repo. While testing, I get an error ,

Error: No provider for DeepLinker! at NoProviderError.Error (native) at NoProviderError.BaseError [as constructor] (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/facade/errors.js:24:0 <- src/test.ts:4082:34) at NoProviderError.AbstractProviderError [as constructor] (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/di/reflective_errors.js:42:0 <- src/test.ts:30215:16) at new NoProviderError (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/di/reflective_errors.js:73:0 <- src/test.ts:30246:16) at ReflectiveInjector_._throwOrNull (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/di/reflective_injector.js:761:0 <- src/test.ts:63303:19) at ReflectiveInjector_._getByKeyDefault (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/di/reflective_injector.js:789:0 <- src/test.ts:63331:25) at ReflectiveInjector_._getByKey (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/di/reflective_injector.js:752:0 <- src/test.ts:63294:25) at ReflectiveInjector_.get (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/di/reflective_injector.js:561:0 <- src/test.ts:63103:21) at TestBed.get (webpack:///home/raj/ionic/bookemon/~/@angular/core/bundles/core-testing.umd.js:817:0 <- src/test.ts:7950:67) at ElementInjector.get (webpack:///home/raj/ionic/bookemon/~/@angular/core/src/linker/element_injector.js:29:0 <- src/test.ts:63494:48) Error: Uncaught (in promise): Error: Error in ./TabsPage class TabsPage - inline template:0:0 caused by: No provider for DeepLinker! at resolvePromise (webpack:///home/raj/ionic/bookemon/~/zone.js/dist/zone.js:468:0 <- src/test.ts:100208:31) at resolvePromise (webpack:///home/raj/ionic/bookemon/~/zone.js/dist/zone.js:453:0 <- src/test.ts:100193:17) at webpack:///home/raj/ionic/bookemon/~/zone.js/dist/zone.js:502:0 <- src/test.ts:100242:17 at ZoneDelegate.invokeTask (webpack:///home/raj/ionic/bookemon/~/zone.js/dist/zone.js:265:0 <- src/test.ts:100005:35) at ProxyZoneSpec.onInvokeTask (webpack:///home/raj/ionic/bookemon/~/zone.js/dist/proxy.js:103:0 <- src/test.ts:27619:39) at ZoneDelegate.invokeTask (webpack:///home/raj/ionic/bookemon/~/zone.js/dist/zone.js:264:0 <- src/test.ts:100004:40) at Zone.runTask (webpack:///home/raj/ionic/bookemon/~/zone.js/dist/zone.js:154:0 <- src/test.ts:99894:47) at drainMicroTaskQueue (webpack:///home/raj/ionic/bookemon/~/zone.js/dist/zone.js:401:0 <- src/test.ts:100141:35)

test.ts which configure the test looks like this .

    export class TestUtils {
    
      public static beforeEachCompiler(components: Array<any>): Promise<{fixture: any, instance: any}> {
        return TestUtils.configureIonicTestingModule(components)
        .compileComponents().then(() => {
          let fixture: any = TestBed.createComponent(components[0]);
          return {
            fixture: fixture,
            instance: fixture.debugElement.componentInstance,
          };
        });
      }
    
      public static configureIonicTestingModule(components: Array<any>): typeof TestBed {
        return TestBed.configureTestingModule({
          declarations: [
          ...components,
          ],
          providers: [
          App, Platform, Form, LoadingController, FormBuilder, ToastController, AlertController,
          { provide: NavController, useClass: NavMock},
          { provide: Config, useClass: ConfigMock},
          { provide: Authentication, useClass: AuthMock},
          { provide: Bookemon, useClass: BookMock}
          ],
          imports: [
          FormsModule,
          IonicModule,
          ReactiveFormsModule,
          ],
        });
      }
    }

And my tests for TabsPage which is a simple tab page in ionic is,
import { ComponentFixture, async } from '@angular/core/testing'; import { TestUtils } from '../../test'; import { TabsPage } from './tabs'; let fixture: ComponentFixture<TabsPage> = null; let instance: any = null; describe('Tabs component',()=>{ beforeEach(async(() => TestUtils.beforeEachCompiler([TabsPage]).then(compiled => { fixture = compiled.fixture; instance = compiled.instance; }))); it('initialises', () => { expect(1).toBeTruthy(); }); })

What is going on here? What is DeepLinker. Where is the error happening. Error happen while compiling this test itself.