addTestObserver(_:)
Registers an object conforming to Xctestobservation as an observer for the current test session.
Declaration
func addTestObserver(_ testObserver: any XCTestObservation)Discussion
Observers may be added at any time, but will not receive events that occurred before they were registered. The observation center maintains a strong reference to observers.Events may be delivered to observers in any order. Given observers A and B, A may be notified of a test failure before or after B. Any ordering dependencies or serialization requirements must be managed by clients.