public void GivenARandomTimerObservableThatPublishesValuesIsCreated(int count)
{
var scheduler = _scenario.GetEx <TestScheduler>();
var dueTime = _scenario.GetEx <Duration>("dueTime");
var minPeriod = _scenario.GetEx <Duration>("minPeriod");
var maxPeriod = _scenario.GetEx <Duration>("maxPeriod");
IObservable <int> obs = ObservableEx
.RandomTimer(dueTime, minPeriod, maxPeriod, scheduler)
.Take(count)
.Select(x => (int)x);
_scenario.Set(obs);
}