private async Task <Dictionary <TestStages, List <Observer> > > RunLifecycle(Dictionary <TestStages, int> observerCountByStage, TestStages?failOnStart, TestStages?failOnStop)
{
// setup lifecycle observers
var observersByStage = new Dictionary <TestStages, List <Observer> >();
var lifecycle = new TestLifecycleSubject(null);
foreach (KeyValuePair <TestStages, int> kvp in observerCountByStage)
{
List <Observer> observers = Enumerable
.Range(0, kvp.Value)
.Select(i => new Observer(failOnStart.HasValue && kvp.Key == failOnStart, failOnStop.HasValue && kvp.Key == failOnStop))
.ToList();
observersByStage[kvp.Key] = observers;
observers.ForEach(o => lifecycle.Subscribe((int)kvp.Key, o));
}
// run lifecycle
if (failOnStart.HasValue)
{
await Assert.ThrowsAsync <Exception>(() => lifecycle.OnStart());
}
else
{
await lifecycle.OnStart();
}
await lifecycle.OnStop();
// return results
return(observersByStage);
}
public async Task MultiStageObserverLifecycleTest()
{
var lifecycle = new TestLifecycleSubject(null);
var multiStageObserver = new MultiStageObserver();
multiStageObserver.Participate(lifecycle);
await lifecycle.OnStart();
await lifecycle.OnStop();
Assert.Equal(4, multiStageObserver.Started.Count);
Assert.Equal(4, multiStageObserver.Stopped.Count);
Assert.True(multiStageObserver.Started.Values.All(o => o));
Assert.True(multiStageObserver.Stopped.Values.All(o => o));
}