How to unit test a component that depends on parameters from ActivatedRoute?

Question

I am unit testing a component that is used to edit an object. The object has an unique id that is used in order to grab the specific object from an array of obj

Answer 1

The simplest way to do this is to just use the useValue attribute and provide an Observable of the value you want to mock.

RxJS < 6

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
...
{
  provide: ActivatedRoute,
  useValue: {
    params: Observable.of({id: 123})
  }
}

RxJS >= 6

import { of } from 'rxjs';
...
{
  provide: ActivatedRoute,
  useValue: {
    params: of({id: 123})
  }
}