How do I test an effect that returns multiple actions

I have an effect that returns action A then action B

@Effect() myEffect$: Observable <Action> = this.actions$
.ofType('MY_ACTION')
.switchMap(() => Observable.of(
// subscribers will be notified
{ type: 'ACTION_ONE' },
// subscribers will be notified (again ...)
{ type: 'ACTION_TWO' }
));


How can I test the two successive returned actions ?

it('should return action one then action two', () => {
runner.queue(new myAction());
const expectedResult = twoSuccesiveActions;
sessionEffect.myEffect$.subscribe(result => {
// how do I test those two succesively returned actions
expect(result).toEqual(expectedResult);
});
});

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