unit test if publish was executed inside another publish

Issue

is it possible to test if eventAggregator.publish was executed during another publish?

this.eventAggregator.with(this).subscribe(Xevent, (event: Xevent) => {
    this.eventAggregator.publish(new anotherEvent());
});

If I test it like this:

describe('when X event is published', () => {
            it('then Y event should be published', () => {
                //arrange
                let event = new Xevent();
                spyOn(evtAggregator, 'publish');
                //act
                evtAggregator.publish(event);
                //assert
                expect(evtAggregator.publish).toHaveBeenCalledWith(new anotherEvent());
            });
        });

jasmine gives me an error that event Aggregator was called with "Xevent":

Expected spy publish to have been called with [ anotherEvent ... ] but actual calls were [ Xevent ...]

Can I assert it a different way or am I something missing in arrange section?

Solution

I had to add ".and.callThrough()" for spy:

describe('when X event is published', () => {
            it('then Y event should be published', () => {
                //arrange
                let event = new Xevent();
                spyOn(evtAggregator, 'publish').and.callThrough(); //here is the change
                //act
                evtAggregator.publish(event);
                //assert
                expect(evtAggregator.publish).toHaveBeenCalledWith(new anotherEvent());
            });
        });

Simpler than I thought.

Answered By - Patryk