Question

我需要测试一种服务方法，并且不确定如何通过调用某些注入的服务方法而运行的部分代码达到100％的代码覆盖率。

要测试的服务方法：

@Injectable()
export class BomRevisiosnsService {
  constructor(
    private baseService: BaseService,
    private appConstants: AppConstants,
    private dmConstants: DMConstants
  ) { }

  public getRevisionsData(): any {
    var itemId = this.appConstants.userPreferences.modelData['basicDetails']['itemId'];
    let url = this.dmConstants.URLs.GETBOMREVISIONS + itemId + "/GetRevisionsAsync";
    let headers = {
      "Content-Type": "application/json",
      UserExecutionContext: JSON.stringify(this.appConstants.userPreferences.UserBasicDetails),
    }
    if (itemId != null || itemId != undefined) {
      return this.baseService.getData(url, headers)
        .map(response => {
          // this area not getting covered.
          return response;
        });
    }
  }
}

我如何覆盖：

.map(response => {
  return response;
});

以下：

测试：

it('should return response if itemId is not null or undefined', () => {
  let mockData = [1,2,3];
  let mockObservable = Observable.of(mockData);
  spyOn(baseService, 'getData').and.returnValue(mockObservable);
  appConstants.userPreferences.modelData['basicDetails']['itemId']=4; // itemId not null or undefined
  dMConstants.URLs.GETBOMREVISIONS ="dummy url";
  subject.getRevisionsData();
  expect(baseService.getData).toBe(mockData); // How do I test .map()?
});

Answer 1

it('should return response if itemId is not null or undefined', () => {
  ...
  const spy = spyOn(baseService.getData).and.return(mockedData)// you need to define data returned by baseService.getData
  const result = subject.getRevisionsData();
  expect(spy).toHaveBeenCalled(); // How do I test .map()?
  expect(result).toEqual(mockedData);// for simple map it will be the same thing that is returned for more complicated map it may differ
});

角度单元测试：如何对.map（）进行单元测试？

1 个答案: