testing observable catch

Hi probably it’s not issue of typemoq but maybe you can help me, and it might be a good example for this lib.

I cannot find a way to test rxjs catch…

Test code:

  let mockHttp:TypeMoq.Mock<Http>;
  let mockErrorHandler:TypeMoq.Mock<ErrorHandler>;
  let httpJSONService:HttpJSONService;

  beforeEach(() => {
    mockHttp = TypeMoq.Mock.ofType(Http);
    mockErrorHandler = TypeMoq.Mock.ofType(ErrorHandler);
    httpJSONService = new HttpJSONService(mockHttp.object, mockErrorHandler.object);
  });

  it('logs error to console on failure', () => {
    const error:any = 'sample-error';
    mockHttp
      .setup(x => x.delete(TypeMoq.It.isAny()))
      .returns(x => Observable.throw(new Error(error))); // does not throw an error, does not trigger catch
      // .throws(new Error(error));  // <-- throws error, does not trigger catch

    httpJSONService.delete(TypeMoq.It.isAny());

    mockErrorHandler.verify(x => x.logToConsole(error), TypeMoq.Times.once());
  });

Code:

 constructor(private http:Http,
             private errorHandler:ErrorHandler) {
  }

  public delete<T>(url:string):Observable<T> {
    return this.http.delete(url)
      .catch((err) => this.errorHandler.logToConsole<T>(err));
  }

[florinn]

I was able to run the tests in your repo after doing the following changes in HttpJSONService.spec.ts:

import {Http, Response, ResponseOptions} from '@angular/http';

mockDataExtractor.callBase = true;
mockErrorHandler.callBase = true;
let mockResponse: TypeMoq.Mock<Response> = TypeMoq.Mock.ofType2(Response, [ResponseOptions]);

it('calls the API to remove data', () => {
...
  mockHttp
    .setup(x => x.delete(TypeMoq.It.isAny()))
    .returns(() => Observable.of(mockResponse.object));

    // when
    httpJSONService.delete(apiUrl).subscribe();
...
});

it('logs error to console on failure', () => {
...
  // when
  httpJSONService.delete(TypeMoq.It.isAny()).subscribe();
...
});

[b091]

sorry for late response, I’m also using typescript 2.

here is my simple example of this test case: repo