public static void Subject_AfterCompletion()
{
ISubject <int> subject = new Subject <int>();
RecordObserver earlyRecorder = new RecordObserver();
subject.Subscribe(earlyRecorder);
subject.OnNext(1);
subject.OnNext(10);
subject.OnCompleted();
subject.OnNext(3);// publication after completion, total useless
Assert.AreEqual(10, earlyRecorder.LastValue);
Assert.AreEqual(2, earlyRecorder.NumOfNextInvoke);
Assert.IsTrue(earlyRecorder.IsCompleted);
// --------------- subscription after completion,
// --------------- no value will published out, no "OnNext" will be invoked
// --------------- chekanote: but "OnCompleted" will be invoked once
RecordObserver lateRecorder = new RecordObserver();
subject.Subscribe(lateRecorder);
Assert.IsFalse(lateRecorder.LastValue.HasValue);
Assert.AreEqual(0, lateRecorder.NumOfNextInvoke);
Assert.IsTrue(lateRecorder.IsCompleted);
}
public static void BehaviorSubject_DefaultValue()
{
var recorder = new RecordObserver();
ISubject <int> subject = new BehaviorSubject <int>(101);
subject.Subscribe(recorder);
Assert.AreEqual(1, recorder.NumOfNextInvoke);
Assert.AreEqual(101, recorder.LastValue);
Assert.IsFalse(recorder.IsCompleted);
}
public static void BehaviorSubject_Overwrite()
{
var recorder = new RecordObserver();
ISubject <int> subject = new BehaviorSubject <int>(1);
subject.OnNext(2);
subject.OnNext(88);
subject.Subscribe(recorder);
// different from ReplaySubject, only the last value is remembered
// previous values are forgotten, so they won't fire "OnNext"
Assert.AreEqual(1, recorder.NumOfNextInvoke);
Assert.AreEqual(88, recorder.LastValue);
Assert.IsFalse(recorder.IsCompleted);
}
public static void ReplaySubject_RememberAll()
{
ISubject <int> subject = new ReplaySubject <int>();
subject.OnNext(1);
subject.OnNext(88);
subject.OnNext(999);
var recorder = new RecordObserver();
subject.Subscribe(recorder);
// all values before the subscription will be remembered and published out as soon as new Observer are subscribed
Assert.AreEqual(3, recorder.NumOfNextInvoke);
Assert.AreEqual(999, recorder.LastValue);
Assert.IsFalse(recorder.IsCompleted);
}
public static void BehaviorSubject_AfterCompletion()
{
var recorder = new RecordObserver();
ISubject <int> subject = new BehaviorSubject <int>(1);
subject.OnNext(11);
subject.OnNext(999);
subject.OnCompleted();
subject.Subscribe(recorder);
// subscribing after completion, no "OnNext" will be fired, but "OnCompletion" will be fired
Assert.AreEqual(0, recorder.NumOfNextInvoke);
Assert.IsFalse(recorder.LastValue.HasValue);
Assert.IsTrue(recorder.IsCompleted);
}
public static void ReplaySubject_AfterCompletion()
{
ISubject <int> subject = new ReplaySubject <int>();
subject.OnNext(1);
subject.OnNext(88);
subject.OnNext(999);
subject.OnCompleted();
var recorder = new RecordObserver();
subject.Subscribe(recorder);
Assert.AreEqual(3, recorder.NumOfNextInvoke);
Assert.IsTrue(recorder.LastValue.HasValue);
Assert.AreEqual(999, recorder.LastValue);
Assert.IsTrue(recorder.IsCompleted);
}
public static void AsyncSubject_OnlyPubWhenCompleted()
{
var recorder = new RecordObserver();
ISubject <int> subject = new AsyncSubject <int>();
subject.Subscribe(recorder);
subject.OnNext(1);
subject.OnNext(2);
Assert.IsFalse(recorder.LastValue.HasValue);
Assert.AreEqual(0, recorder.NumOfNextInvoke);
subject.OnCompleted();
Assert.IsTrue(recorder.LastValue.HasValue);
Assert.AreEqual(2, recorder.LastValue);
Assert.IsTrue(recorder.IsCompleted);
Assert.AreEqual(1, recorder.NumOfNextInvoke);
}
public static void AsyncSubject_AfterCompletion()
{
var earlyRecorder = new RecordObserver();
ISubject <int> subject = new AsyncSubject <int>();
subject.Subscribe(earlyRecorder);
subject.OnNext(1);
subject.OnNext(88);
subject.OnCompleted();
Assert.AreEqual(88, earlyRecorder.LastValue);
Assert.AreEqual(1, earlyRecorder.NumOfNextInvoke);
// AsyncSubject is stateful, even subscribing after completion, the observer can also get data
var lateRecorder = new RecordObserver();
subject.Subscribe(lateRecorder);
Assert.IsTrue(lateRecorder.IsCompleted);
Assert.AreEqual(88, lateRecorder.LastValue);
Assert.AreEqual(1, lateRecorder.NumOfNextInvoke);
}
public void Setup()
{
m_observer = new RecordObserver();
}
