NGXS：测试分派的动作不适用于 ofActionDispatched

Posted 2023-03-16

【中文标题】NGXS：测试分派的动作不适用于 ofActionDispatched

【英文标题】：NGXS: Testing dispatched action is not working with ofActionDispatched

【发布时间】：2019-04-29 09:21:02

【问题描述】：

我正在尝试测试动作调度，但它在我的测试中不起作用... 组件表现正常，action 被调度，但是 actions$.pipe 没有捕捉到 action，所以无法在测试中检查。

代码：

describe('ResponsiveService', () => 
  let store, actions$;
  const observableMediaMock = 
    subscribe : (callback: (change: MediaChange) => void) =>  
      this.callback = callback 
    ,
    triggerMediaChange: (change: MediaChange) => this.callback(change)
  ;
  beforeEach(() => 
    TestBed.configureTestingModule(
        imports: [
            FlexLayoutModule,
            NgxsModule.forRoot([MediaState])
        ],
        providers: [ResponsiveService,  provide: ObservableMedia, useValue: observableMediaMock ]
    );
    store = TestBed.get(Store);
    actions$ = TestBed.get(Actions);
  );

  it('should be created', inject([ResponsiveService], (service: ResponsiveService) => 
    expect(service).toBeTruthy();
  ));

  it("should send get request", function(done) 
    inject([ResponsiveService], (service: ResponsiveService) => 
      const mediaQueryValue = 'mediaQuery',
            mqAliasValue = 'mqAlias',
            suffixValue = 'suffix';

      actions$.pipe(ofActionDispatched([MediaChanged]))
      .subscribe((payload) => 
        expect(payload).toBeTruthy();
        expect(payload.mediaQuery).toEqual(mediaQueryValue);
        done();
      );
      service.init();

      observableMediaMock.triggerMediaChange(new MediaChange(null, mediaQueryValue, mqAliasValue, suffixValue));
    )(); // function returned by 'inject' has to be invoked
  );
);

谢谢！

【参考方案1】：

将您的测试更新为以下内容：

it("should send get request", async( () => 
  inject([ResponsiveService], (service: ResponsiveService) => 
  const mediaQueryValue = 'mediaQuery',
        mqAliasValue = 'mqAlias',
        suffixValue = 'suffix';

  actions$.pipe(ofActionDispatched(MediaChanged))
  .subscribe((payload) => 
    expect(payload).toBeTruthy();
    expect(payload.mediaQuery).toEqual(mediaQueryValue);
  );
  service.init();

  observableMediaMock.triggerMediaChange(new MediaChange(null, mediaQueryValue, mqAliasValue, suffixValue));
  )(); // function returned by 'inject' has to be invoked
));

ofActionDispatched 不接受列表作为输入，但评估者接受项目列表，例如：ofActionDispatched(MediaChanged, SomeOtherAction)。

您还应该能够删除 done 函数并将测试包装在普通的 async 块中。希望这会有所帮助，不确定我是否正确打开和关闭了所有括号。

【讨论】：

太棒了，非常感谢！还有异步提示，再次感谢！