favorite-movies.service.spec.ts

  it('should fail if the backend returns an error 3 times in a row', done => {
    let bubblesUpTheError = false;
    serviceUnderTest.getFavoriteMovies().subscribe(() => {}, () => (bubblesUpTheError = true);

    const req = http.expectOne(environment.favoriteUrl, 'expected to make an initial request');
    expect(req.request.method).toEqual('GET');
    req.flush('ERROR', { status: 500, statusText: 'Internal server error' });

    const req2 = http.expectOne(environment.favoriteUrl, 'expected to make a second request');
    expect(req2.request.method).toEqual('GET');
    req2.flush('ERROR', { status: 500, statusText: 'Internal server error' });

    const req3 = http.expectOne(environment.favoriteUrl, 'exected to make a third request');
    expect(req3.request.method).toEqual('GET');
    req3.flush('ERROR', { status: 500, statusText: 'Internal server error' });

    expect(bubblesUpTheError).toBeTruthy();
    http.verify();
  });