以角度运行单元测试

Question

I am running unit test for angular app.I expect ng init to be called

Component.ts:

ngOnInit() {
    this.topToolBarService.change.subscribe(customer => {
      this.filter.customerid = customer;
      this.customerid = customer;
      this.getData();
    });

service.ts

@Output() change: EventEmitter<boolean> = new EventEmitter();

sendCustomer(customer) {
    this.customer = customer;
    this.change.emit(customer);
}

Actual test:

it('should call ngonint',()=>{
    mockService.createSpyObj();
    mockService.change = of("0LPT_id0306");
    fixture.detectChanges();
    expect(fixture.componentInstance.ngOnInit).toHaveBeenCalled();
  })

expected: test passed ; Actual:TypeError: Cannot read property 'createSpyObj' of undefined

Answer 1

the error: Actual:TypeError: Cannot read property 'createSpyObj' of undefined says that mockService is undefined. So the test is not completed.