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

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

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

            Assert.False(called);
        }