Question

我想知道如何在if语句中更改和测试从订阅返回的值。

使用一种预订数据服务的方法，如下所示：

    this.service.returnResponse().subscribe((value) => {
        if (value !== null) {
            ....test in here
        }
    });

测试中的数据将返回null，我想将返回的值更改为我设置的参数，例如：

   it('should query data service and subscribe to response TRUE ()', () => {
      const response: string[] = ['NOT-NULL'];

      service.returnEndResponseMS().subscribe(value => {
         value ==..andReturn(response)

      });

      component.subscribeToConnection();
      fixture.detectChanges();
   });

我们如何更改预订的返回值以测试内部条件块？

Answer 1

简单的解决方案：

  it('should query data service and subscribe to response TRUE ()', () => {

    const response: string[] = ['NOT-NULL'];
    spyOn(service, 'returnResponse').and.returnValue(of(response));

    service.returnResponse).subscribe(value => {
      expect(something to be equal to something);
      expect(something to be called);

    });

    component.subscribeToConnection();
    fixture.detectChanges();
  });

AngularTS，订阅测试

1 个答案: