public void Disposed()
{
var us = new MonocastSubject <int>();
var to = new TestObserverLocal();
bool[] disposed = { false };
var d = us.ConcatMap(v => new OnDispose <int>(Enumerable.Range(v * 100, 5), disposed))
.SubscribeWith(to);
Assert.True(us.HasObserver());
to.AssertEmpty();
us.OnNext(1);
to.AssertValuesOnly(100, 101, 102, 103, 104);
Assert.True(us.HasObserver());
us.OnNext(2);
Assert.False(us.HasObserver());
Assert.True(disposed[0]);
to.AssertResult(100, 101, 102, 103, 104, 200, 201);
}