angular - Running jasmine tests for a component with NgZone dependency

Question

How would I go ahead with running a jasmine test for the following component:

@Component({
  moduleId: module.id,
  selector: "testComp",
  template: "<div>{{value}}</div>",
})
export class TestComp {
  public value: string = "This is me";
  constructor(public zone: NgZone) {
    this.zone.run(() => console.log("zone is here"));
  }
}

The following fails with the Can't resolve all parameters for NgZone:

describe("test", () => {
    let fixture;
    let component;

beforeEach(async(() => {
    TestBed.configureTestingModule({
        declarations: [TestComp],
        schemas: [NO_ERRORS_SCHEMA],
        providers: [NgZone]
    }).compileComponents;
}));
beforeEach(() => {
    fixture = TestBed.createComponent(TestComp);
    component = fixture.debugElement.componentInstance;
});
it("should check that the component is created", () => {
    expect(component).toBeTruthy();
});

})

using Angular 4.1.3. I found the MockNgZone class @ https://no-shadow-angular-io.firebaseapp.com/docs/ts/latest/api/core/testing/MockNgZone-class.html. But it seems unavailable in the @angular/core/testing for this particular version:

Anybody knows what I should do to test this component?

Regards

Answer 1

If your problem is about runOutsideAngular because then you cannot use async or fakeAsync, the only thing you need to mock is that function and the following works well:

const ngZone = TestBed.get(NgZone);

spyOn(ngZone, 'runOutsideAngular').and.callFake((fn: Function) => fn());