Angular tests failing with Failed to execute 'send' on 'XMLHttpRequest'

Question

I am trying to test my angular 4.1.0 component -

export class CellComponent implements OnInit {
  lines: Observable>;
  @Input() dep         


        

Answer 1

In my case the culprit was observable.timeout(x).retry(y) applied somewhere on the returned Observable on the service class level, then again in the component which was using that service.

Everything worked correctly in the browser up until angular-cli 1.4. Then started failing during Karma tests (with such a silly error). The solution was of course to tidy up these timeout/retry operators.