public void GivenAResetTimerObservableIsCreatedThatUsesAsTheResetSource(string streamKey)
{
var scheduler = _scenario.GetEx <TestScheduler>();
var resetSource = _scenario.GetEx <IObservable <int> >(streamKey);
var dueTime = _scenario.GetEx <Duration>("dueTime");
var period = _scenario.GetEx <Duration>("period");
IObservable <int> obs = ObservableEx
.ResetTimer(dueTime, period, resetSource, scheduler).Select(x => (int)x);
_scenario.Set(obs);
}