public void TakeUntil_ArgumentChecking()
{
ReactiveAssert.Throws <ArgumentNullException>(() => Subscribable.TakeUntil <int, int>(null, DummySubscribable <int> .Instance));
ReactiveAssert.Throws <ArgumentNullException>(() => Subscribable.TakeUntil <int, int>(DummySubscribable <int> .Instance, null));
ReactiveAssert.Throws <ArgumentNullException>(() => Subscribable.TakeUntil(default(ISubscribable <int>), DateTimeOffset.Now));
}