NSubstitute vs PRISM EventAggregator: Assert that calling a method triggers event with correct payload

Question

Consider the below method that updates a person and publishes an event through the PRISM EventAggregator to indicate that the person has been updated.

I would like t

Answer 1

I'm not an experienced unit tester so I'm not sure this is the correct unit test to write. But anyway, this is how I tested it so far and it seems to do what I want.

[Test]
public void TestPersonUpdateSendsEventWithCorrectPayload()
{
    // ARRANGE
    PersonUpdatedEventArgs payload = null;
    _eventAggregator
        .GetEvent()
        .Subscribe(message => payload = message);

    // ACT
    _personService.UpdatePerson(5);

    // ASSERT
    payload.Should().NotBeNull();
    payload.Id.Should().Be(5);
}

Feedback welcome.