public void Required_spec317_mustNotSignalOnErrorWhenPendingAboveLongMaxValue_shouldFail_onSynchOverflowingPublisher()
{
var demand = 0L;
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
// it does not protect from demand overflow!
demand += n;
if (demand < 0)
{
// overflow
subscriber.OnError(new IllegalStateException("Illegally signalling OnError (violates rule 3.17)")); // Illegally signal error
}
else
{
subscriber.OnNext(0);
}
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec317_mustNotSignalOnErrorWhenPendingAboveLongMaxValue(),
"Async error during test execution: Illegally signalling OnError (violates rule 3.17)");
}
public void Required_spec107_mustNotEmitFurtherSignalsOnceOnCompleteHasBeenSignalled_shouldFailForPublisherWhichCompletesButKeepsServingData()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
var completed = false;
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
// emit one element
subscriber.OnNext(0);
// and "complete"
// but keep signalling data if more demand comes in anyway!
if (!completed)
{
subscriber.OnComplete();
completed = true;
}
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec107_mustNotEmitFurtherSignalsOnceOnCompleteHasBeenSignalled(),
"Unexpected element 0 received after stream completed");
}
public void Required_spec317_mustNotSignalOnErrorWhenPendingAboveLongMaxValue_forSynchronousPublisher()
{
var sent = new AtomicCounter(0);
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
var started = false;
var cancelled = false;
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
if (!started)
{
started = true;
while (!cancelled)
{
subscriber.OnNext(sent.GetAndIncrement());
}
}
}, onCancel: () => cancelled = true));
});
var verification = CustomPublisherVerification(publisher);
verification.Required_spec317_mustNotSignalOnErrorWhenPendingAboveLongMaxValue();
// 11 due to the implementation of this particular TCK test (see impl)
Assert.AreEqual(11, sent.Current);
}
public void Required_spec109_mayRejectCallsToSubscribeIfPublisherIsUnableOrUnwillingToServeThemRejectionMustTriggerOnErrorAfterOnSubscribe_shouldFail()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber => subscriber.OnSubscribe(new LamdaSubscription()));
var verification = CustomPublisherVerification(null, publisher);
RequireTestFailure(() => verification.Required_spec109_mayRejectCallsToSubscribeIfPublisherIsUnableOrUnwillingToServeThemRejectionMustTriggerOnErrorAfterOnSubscribe(),
"Should have received OnError");
}
public void Required_spec109_mustIssueOnSubscribeForNonNullSubscriber_mustFailIfOnErrorHappensFirst()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber => subscriber.OnError(new TestException()));
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec109_mustIssueOnSubscribeForNonNullSubscriber(),
"OnSubscribe should be called prior to OnError always");
}
public void Required_spec109_subscribeThrowNPEOnNullSubscriber_shouldFailIfDoesntThrowNPE()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber => { });
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec109_subscribeThrowNPEOnNullSubscriber(),
"Publisher did not throw a ArgumentNullException when given a null Subscribe in subscribe");
}
public void Optional_spec105_emptyStreamMustTerminateBySignallingOnComplete_shouldNotAllowEagerOnComplete()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber => subscriber.OnComplete());
var verification = new Spec105Verification(NewTestEnvironment(), publisher);
RequireTestFailure(() => verification.Optional_spec105_emptyStreamMustTerminateBySignallingOnComplete(),
"Subscriber.OnComplete() called before Subscriber.OnSubscribe");
}
// FAILING IMPLEMENTATIONS //
/// <summary>
/// Verification using a Publisher that never publishes any element.
/// Skips the error state publisher tests.
/// </summary>
private PublisherVerification <int> NoopPublisherVerification()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription());
});
return(new SimpleVerification(NewTestEnvironment(), publisher));
}
public void Optional_spec104_mustSignalOnErrorWhenFails_shouldFail()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
throw new Exception("It is not valid to throw here!");
});
var verification = CustomPublisherVerification(null, publisher);
RequireTestFailure(() => verification.Optional_spec104_mustSignalOnErrorWhenFails(),
"Publisher threw exception (It is not valid to throw here!) instead of signalling error via onError!");
}
public void Required_spec109_mayRejectCallsToSubscribeIfPublisherIsUnableOrUnwillingToServeThemRejectionMustTriggerOnErrorAfterOnSubscribe_actuallyPass()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription());
subscriber.OnError(new Exception("Sorry, I'm busy now. Call me later."));
});
CustomPublisherVerification(null, publisher)
.Required_spec109_mayRejectCallsToSubscribeIfPublisherIsUnableOrUnwillingToServeThemRejectionMustTriggerOnErrorAfterOnSubscribe();
}
/// <summary>
/// Verification using a Publisher that never publishes any element
/// </summary>
private PublisherVerification <int> OnErroringPublisherVerification()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
subscriber.OnError(new TestException());
}));
});
return(new SimpleVerification(NewTestEnvironment(), publisher));
}
public void Required_spec307_afterSubscriptionIsCancelledAdditionalCancelationsMustBeNops_shouldFailBy_unexpectedErrorInCancelling()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription(onCancel: () =>
{
subscriber.OnError(new TestException());// illegal error signalling!
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec307_afterSubscriptionIsCancelledAdditionalCancelationsMustBeNops(),
"Async error during test execution: Test Exception: Boom!");
}
public void Required_spec303_mustNotAllowUnboundedRecursion_shouldFailBy_informingAboutTooDeepStack()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
subscriber.OnNext(0); // naive reccursive call, would explode with StackOverflowException
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec303_mustNotAllowUnboundedRecursion(),
/*Got 2 onNext calls within thread: ... */ "yet expected recursive bound was 1");
}
/// <summary>
/// Verification using a Publisher that publishes elements even with no demand available
/// </summary>
private PublisherVerification <int> DemandIgnoringSynchronousPublisherVerification()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
for (var i = 0L; i <= n; i++)
{
// one too much
subscriber.OnNext((int)i);
}
}));
});
return(new SimpleVerification(new TestEnvironment(), publisher));
}
public void Optional_spec111_multicast_mustProduceTheSameElementsInTheSameSequenceToAllOfItsSubscribersWhenRequestingManyUpfront_shouldFailBy_expectingOnError()
{
var random = new Random();
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
for (var i = 0; i < n; i++)
{
subscriber.OnNext(random.Next());
}
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Optional_spec111_multicast_mustProduceTheSameElementsInTheSameSequenceToAllOfItsSubscribersWhenRequestingManyUpfront(),
"Expected elements to be signaled in the same sequence to 1st and 2nd subscribers");
}
public void Stochastic_spec103_mustSignalOnMethodsSequentially_shouldPass_forSynchronousPublisher()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
var element = 0;
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
for (var i = 0; i < n; i++)
{
subscriber.OnNext(element++);
}
subscriber.OnComplete();
}));
});
CustomPublisherVerification(publisher).Stochastic_spec103_mustSignalOnMethodsSequentially();
}
public void Required_spec105_mustSignalOnCompleteWhenFiniteStreamTerminates_shouldFail()
{
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
var signal = 0;
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
for (var i = 0; i < n; i++)
{
subscriber.OnNext(signal++);
}
// intentional omission of onComplete
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec105_mustSignalOnCompleteWhenFiniteStreamTerminates(),
messagePart: "Expected end-of-stream but got element [3]");
}
public void Required_spec313_cancelMustMakeThePublisherEventuallyDropAllReferencesToTheSubscriber_shouldFailBy_keepingTheReferenceLongerThanNeeded()
{
ISubscriber <int> sub;
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
sub = subscriber;// keep the reference
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
for (var i = 0; i < n; i++)
{
subscriber.OnNext((int)n);
}
}, onCancel: () =>
{
// noop, we still keep the reference!
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec313_cancelMustMakeThePublisherEventuallyDropAllReferencesToTheSubscriber(),
"did not drop reference to test subscriber after subscription cancellation");
}
public void Required_spec317_mustSupportACumulativePendingElementCountUpToLongMaxValue_shouldFailWhenErrorSignalledOnceMaxValueReached()
{
var demand = 0L;
var publisher = new LamdaPublisher <int>(onSubscribe: subscriber =>
{
subscriber.OnSubscribe(new LamdaSubscription(onRequest: n =>
{
demand += n;
// this is a mistake, it should still be able to accumulate such demand
if (demand == long.MaxValue)
{
subscriber.OnError(new IllegalStateException("Illegally signalling onError too soon! Cumulative demand equal to long.MaxValue is legal."));
}
subscriber.OnNext(0);
}));
});
var verification = CustomPublisherVerification(publisher);
RequireTestFailure(() => verification.Required_spec317_mustSupportACumulativePendingElementCountUpToLongMaxValue(),
"Async error during test execution: Illegally signalling onError too soon!");
}
