Ionic 4 Testing with Storage

@jeremyy7 wrote:

Can someone provide me with an example of how to mock the Storage module and implement it? I am simply attempting to test a redirect but because the component uses Storage, I keep seeing an error:

Failed: StaticInjectorError(DynamicTestModule)[Storage]: 
  StaticInjectorError(Platform: core)[Storage]: 
    NullInjectorError: No provider for Storage!

So far my test looks as follows:

describe('AppComponent', () => {

  let statusBarSpy, splashScreenSpy, platformReadySpy, platformSpy;
  let router: Router;
  let location: Location;
  let fixture;

  beforeEach(async(() => {
    statusBarSpy = jasmine.createSpyObj('StatusBar', ['styleDefault']);
    splashScreenSpy = jasmine.createSpyObj('SplashScreen', ['hide']);
    platformReadySpy = Promise.resolve();
    platformSpy = jasmine.createSpyObj('Platform', { ready: platformReadySpy });

    TestBed.configureTestingModule({
      declarations: [AppComponent],
      imports: [
        RouterTestingModule.withRoutes(routes),
        HttpClientTestingModule,
      ],
      schemas: [CUSTOM_ELEMENTS_SCHEMA],
      providers: [
        { provide: StatusBar, useValue: statusBarSpy },
        { provide: SplashScreen, useValue: splashScreenSpy },
        { provide: Platform, useValue: platformSpy },
      ],
    }).compileComponents();

    router = TestBed.get(Router);
    location = TestBed.get(Location);
    fixture = TestBed.createComponent(AppComponent);
    router.initialNavigation();
  }));

  it('navigates to "" redirects you to /login', fakeAsync(() => {
    router.navigate(['']);
    tick();
    expect(location.path()).toBe('/login')
  }));

I am pretty new to testing in Angular so any point in the right direction would be very helpful.

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