System.Reactive.EventStreamSpec.WhenPushingEventOnly_ThenCannotSubscribeToEventPattern C# (CSharp) Method

        public void WhenPushingEventOnly_ThenCannotSubscribeToEventPattern()
        {
            var stream = new EventStream();
            var called = false;

            using (var subscription = stream.Of<IEventPattern<PatientEnteredHospital>>().Subscribe(c => called = true))
            {
                stream.Push(new PatientEnteredHospital());
            }

            Assert.False(called);
        }