Angular 下标后角5单元测试中的测试误差

我的Angular 5控制器中有以下函数，我想在其上使用karma进行单元测试

this.search.getFirstSearch().subscribe(data => {
      this.processSchool = data.search3,
        error =><any> this.errorMessage,
        ()=>{
          if(this.errorMessage ===''){
    console.log('abc')
          }else{
            console.log('xxxx')
          }
        }

    });

从生成的报告中，不包括错误部分。我错过了什么

---

您可以尝试使用.and.throwerr，如前所述和

---

根据您所拥有的，我认为您可能有一些无关的花括号来包装传递给subscribe方法的参数。订阅（[onNext]、[onError]、[onCompleted]）。否则，您已经设置了不分配任何变量且永远不会运行的方法（这就是为什么它说代码永远不会运行的原因）

it('should simulate error 1  ', () => {
    fixture.detectChanges();

    const searchService = fixture.debugElement.injector.get(SearchService);
    const mockCall= spyOn(searchService, 'getFirstSearch').and.returnValue(Observable.throw({status: 404}));

    //call method 
    comp.processData();

  });

  it('should simulate error 2  ', () => {

    const searchService = fixture.debugElement.injector.get(SearchService);
    const mockCall= spyOn(searchService, 'getFirstSearch').and.returnValue(Observable.throw({message: ""}));

    //call method 
    comp.processData();
  });



  it('should simulate error 3 ', async(() => { fixture.detectChanges();
    const searchService = fixture.debugElement.injector.get(SearchService);
    let    error404 = {status: 404};
    backend.connections.subscribe((connection: MockConnection) => {
      connection.mockError(error404 as any as Error);
    });

    comp.processData();
  }));


  ////added test

  it('should simulate error 4 ', () => { fixture.detectChanges();

    const searchService = fixture.debugElement.injector.get(SearchService);
    const mockCall= spyOn(searchService, 'getFirstSearch').and.returnValue(
      new ErrorObservable('TwainService test failure'))

    comp.processData();


  });

  it('should simulate error 5', () => { fixture.detectChanges();

    const searchService = fixture.debugElement.injector.get(SearchService);
    const mockCall= spyOn(searchService, 'getFirstSearch').and.returnValue(Observable.throw({message: ""}));

    comp.processData();

  });

spyOn(searchService, 'getFirstSearch').and.throwError({status: 404});

this.search.getFirstSearch().subscribe(
  data => this.processSchool = data.search3, // onNext
  error => this.errorMessage = error,  // onError
  () => { // onCompleted
    if(this.errorMessage === '') {
      console.log('abc')
    } else {
      console.log('xxxx')
    }
  }
);