testing.ts

describe(‘My Effects’, () => {
  let effects: MyEffects;
  let actions: Observable<any>;

  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [
        MyEffects,
        provideMockActions(() => actions),
        // other providers
      ],
    });

    effects = TestBed.get(MyEffects);
  });

  it(‘should work’, () => {
    actions = hot(‘—a-’, { a: SomeAction,  … });
    const expected = cold(‘—b’, { b: AnotherAction });
    expect(effects.someSource$).toBeObservable(expected);
  });
});