public async Task TestResult()
{
var observable = new DelayObservable <int>(1);
int result = await observable.WaitFirst();
Assert.AreEqual(1, result);
Assert.AreEqual(true, observable.Disposable.IsDisposed);
}
public Delay(DelayObservable <T> parent, IObserver <T> observer, IDisposable cancel) : base(observer, cancel)
{
this.parent = parent;
}