Do I need async block when testing a code which returns an Observable












0















I have written the following spec which tests sendMessage function. sendMessage sends a post message and returns an Observable<HttpEvent<any>>. So far I have not used async and the test case is getting passed. I am wondering if this is the right way to code the spec or should I use async (because there might be a race condition which isn't happening at the moment, making my test case pass)



fit('should return HttpEvent of type HttpResponse',()=>{ //should I change this to async block and use whenStable to wait for the Observable
//create our expectation what should be returned by the sendMessage. It should return Observable<HttpEvent<any>>
const responseData = { result: 'success', ['additional-info']: 'some data from server' };
let httpEvent:HttpResponse<any> = new HttpResponse<any>({body:responseData});
let helperService = TestBed.get(HelperService);//extract helper service
let httpMock = TestBed.get(HttpTestingController);
//call the sendMessage function and subscribe to its observable.
let result:Observable<HttpEvent<any>> = helperService.sendMessage('/someURL','someBody',httpOptions);
let subscription = result.subscribe((event:HttpEvent<any>)=>{
console.log('got response ',event);
//I want to test that sendMessage returns HttpEvent of type Response
expect(event).toBeTruthy();
let isResponseType0 = (event.type === 0);
let isResponseTypeResponse = (event.type === HttpEventType.Response);
expect(isResponseType0 || isResponseTypeResponse).toEqual(true);
});
//Below, TestRequest is a mock request that was received and is ready to be answered.
const mockReq:TestRequest = httpMock.expectOne('/someURL'); //Expect that a single request has been made which matches the given URL, and return its mock
console.log('mock request is ',mockReq);
expect(mockReq.cancelled).toBeFalsy();
expect(mockReq.request.responseType).toEqual('json');
//once mocking of sending request is done, mock receiving a response. This will trigger the logic inside subscribe function
mockReq.flush(httpEvent); //flush method provides dummy values as response

httpMock.verify();//verify checks that there are no outstanding requests;

});
});









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    0















    I have written the following spec which tests sendMessage function. sendMessage sends a post message and returns an Observable<HttpEvent<any>>. So far I have not used async and the test case is getting passed. I am wondering if this is the right way to code the spec or should I use async (because there might be a race condition which isn't happening at the moment, making my test case pass)



    fit('should return HttpEvent of type HttpResponse',()=>{ //should I change this to async block and use whenStable to wait for the Observable
    //create our expectation what should be returned by the sendMessage. It should return Observable<HttpEvent<any>>
    const responseData = { result: 'success', ['additional-info']: 'some data from server' };
    let httpEvent:HttpResponse<any> = new HttpResponse<any>({body:responseData});
    let helperService = TestBed.get(HelperService);//extract helper service
    let httpMock = TestBed.get(HttpTestingController);
    //call the sendMessage function and subscribe to its observable.
    let result:Observable<HttpEvent<any>> = helperService.sendMessage('/someURL','someBody',httpOptions);
    let subscription = result.subscribe((event:HttpEvent<any>)=>{
    console.log('got response ',event);
    //I want to test that sendMessage returns HttpEvent of type Response
    expect(event).toBeTruthy();
    let isResponseType0 = (event.type === 0);
    let isResponseTypeResponse = (event.type === HttpEventType.Response);
    expect(isResponseType0 || isResponseTypeResponse).toEqual(true);
    });
    //Below, TestRequest is a mock request that was received and is ready to be answered.
    const mockReq:TestRequest = httpMock.expectOne('/someURL'); //Expect that a single request has been made which matches the given URL, and return its mock
    console.log('mock request is ',mockReq);
    expect(mockReq.cancelled).toBeFalsy();
    expect(mockReq.request.responseType).toEqual('json');
    //once mocking of sending request is done, mock receiving a response. This will trigger the logic inside subscribe function
    mockReq.flush(httpEvent); //flush method provides dummy values as response

    httpMock.verify();//verify checks that there are no outstanding requests;

    });
    });









    share|improve this question

























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      I have written the following spec which tests sendMessage function. sendMessage sends a post message and returns an Observable<HttpEvent<any>>. So far I have not used async and the test case is getting passed. I am wondering if this is the right way to code the spec or should I use async (because there might be a race condition which isn't happening at the moment, making my test case pass)



      fit('should return HttpEvent of type HttpResponse',()=>{ //should I change this to async block and use whenStable to wait for the Observable
      //create our expectation what should be returned by the sendMessage. It should return Observable<HttpEvent<any>>
      const responseData = { result: 'success', ['additional-info']: 'some data from server' };
      let httpEvent:HttpResponse<any> = new HttpResponse<any>({body:responseData});
      let helperService = TestBed.get(HelperService);//extract helper service
      let httpMock = TestBed.get(HttpTestingController);
      //call the sendMessage function and subscribe to its observable.
      let result:Observable<HttpEvent<any>> = helperService.sendMessage('/someURL','someBody',httpOptions);
      let subscription = result.subscribe((event:HttpEvent<any>)=>{
      console.log('got response ',event);
      //I want to test that sendMessage returns HttpEvent of type Response
      expect(event).toBeTruthy();
      let isResponseType0 = (event.type === 0);
      let isResponseTypeResponse = (event.type === HttpEventType.Response);
      expect(isResponseType0 || isResponseTypeResponse).toEqual(true);
      });
      //Below, TestRequest is a mock request that was received and is ready to be answered.
      const mockReq:TestRequest = httpMock.expectOne('/someURL'); //Expect that a single request has been made which matches the given URL, and return its mock
      console.log('mock request is ',mockReq);
      expect(mockReq.cancelled).toBeFalsy();
      expect(mockReq.request.responseType).toEqual('json');
      //once mocking of sending request is done, mock receiving a response. This will trigger the logic inside subscribe function
      mockReq.flush(httpEvent); //flush method provides dummy values as response

      httpMock.verify();//verify checks that there are no outstanding requests;

      });
      });









      share|improve this question














      I have written the following spec which tests sendMessage function. sendMessage sends a post message and returns an Observable<HttpEvent<any>>. So far I have not used async and the test case is getting passed. I am wondering if this is the right way to code the spec or should I use async (because there might be a race condition which isn't happening at the moment, making my test case pass)



      fit('should return HttpEvent of type HttpResponse',()=>{ //should I change this to async block and use whenStable to wait for the Observable
      //create our expectation what should be returned by the sendMessage. It should return Observable<HttpEvent<any>>
      const responseData = { result: 'success', ['additional-info']: 'some data from server' };
      let httpEvent:HttpResponse<any> = new HttpResponse<any>({body:responseData});
      let helperService = TestBed.get(HelperService);//extract helper service
      let httpMock = TestBed.get(HttpTestingController);
      //call the sendMessage function and subscribe to its observable.
      let result:Observable<HttpEvent<any>> = helperService.sendMessage('/someURL','someBody',httpOptions);
      let subscription = result.subscribe((event:HttpEvent<any>)=>{
      console.log('got response ',event);
      //I want to test that sendMessage returns HttpEvent of type Response
      expect(event).toBeTruthy();
      let isResponseType0 = (event.type === 0);
      let isResponseTypeResponse = (event.type === HttpEventType.Response);
      expect(isResponseType0 || isResponseTypeResponse).toEqual(true);
      });
      //Below, TestRequest is a mock request that was received and is ready to be answered.
      const mockReq:TestRequest = httpMock.expectOne('/someURL'); //Expect that a single request has been made which matches the given URL, and return its mock
      console.log('mock request is ',mockReq);
      expect(mockReq.cancelled).toBeFalsy();
      expect(mockReq.request.responseType).toEqual('json');
      //once mocking of sending request is done, mock receiving a response. This will trigger the logic inside subscribe function
      mockReq.flush(httpEvent); //flush method provides dummy values as response

      httpMock.verify();//verify checks that there are no outstanding requests;

      });
      });






      angular6






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      asked Nov 16 '18 at 5:55









      Manu ChadhaManu Chadha

      3,40721945




      3,40721945
























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