public void Locks_itself_and_notifies_when_failure_rate_exceeds_defined_threshold()
{
worker.ThrowException = true;
Assert.Throws <ApiUnavailableException>(async() => await api.Answer(query));
Assert.Throws <ApiUnavailableException>(async() => await api.Answer(query));
Assert.Throws <ApiUnavailableException>(async() => await api.Answer(query));
IsTrue(() => Observers.Events().Count() == 1);
IsTrue(() => Observers.FirstEvent <AvailabilityChanged>().Available == false);
IsTrue(() => Timers.Count() == 1);
var timer = Timer("check");
IsTrue(() => timer.Callback == api.CheckAvailability);
IsTrue(() => timer.Due == TimeSpan.FromSeconds(1));
IsTrue(() => timer.Period == TimeSpan.FromSeconds(1));
}