public void TestCancelAfter_TimerReset()
{
TimeSpan initialTimeout = TimeSpan.FromSeconds(0.10);
TimeSpan updatedTimeout = TimeSpan.FromSeconds(0.35);
CancellationTokenSource cts = new CancellationTokenSource();
Stopwatch timer = Stopwatch.StartNew();
CancellationTokenSourceExtensions.CancelAfter(cts, initialTimeout);
CancellationTokenSourceExtensions.CancelAfter(cts, updatedTimeout);
// a task which never completes
Task[] tasks = { new TaskCompletionSource <object>().Task };
try
{
Task.WaitAll(tasks, cts.Token);
Assert.Fail("The CancellationTokenSource failed to cancel.");
}
catch (OperationCanceledException)
{
TimeSpan elapsed = timer.Elapsed;
Assert.IsTrue(elapsed >= updatedTimeout - AdvanceTolerance, "The CancellationTokenSource canceled too soon ({0} sec < {1} sec).", elapsed.TotalSeconds, (updatedTimeout - AdvanceTolerance).TotalSeconds);
Assert.IsTrue(elapsed <= updatedTimeout + DelayTolerance, "The CancellationTokenSource canceled too late ({0} sec > {1} sec).", elapsed.TotalSeconds, (updatedTimeout + DelayTolerance).TotalSeconds);
}
}
public void TestCancelAfter_TimerPinning()
{
TimeSpan timeout = TimeSpan.FromSeconds(0.40);
CancellationTokenSource cts = new CancellationTokenSource();
Stopwatch timer = Stopwatch.StartNew();
CancellationTokenSourceExtensions.CancelAfter(cts, timeout);
GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
GC.WaitForFullGCComplete();
// a task which never completes
Task[] tasks = { new TaskCompletionSource <object>().Task };
try
{
Task.WaitAll(tasks, cts.Token);
Assert.Fail("The CancellationTokenSource failed to cancel.");
}
catch (OperationCanceledException)
{
// The specific time of cancellation is not relevant to this test.
}
}
public void TestCancelAfter_TimerPinning()
{
TimeSpan timeout = TimeSpan.FromSeconds(0.40);
TimeSpan tolerance = TimeSpan.FromSeconds(0.025);
CancellationTokenSource cts = new CancellationTokenSource();
Stopwatch timer = Stopwatch.StartNew();
CancellationTokenSourceExtensions.CancelAfter(cts, timeout);
GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced, true);
// a task which never completes
Task[] tasks = { new TaskCompletionSource<object>().Task };
try
{
Task.WaitAll(tasks, cts.Token);
Assert.Fail("The CancellationTokenSource failed to cancel.");
}
catch (OperationCanceledException)
{
TimeSpan elapsed = timer.Elapsed;
Assert.IsTrue(elapsed >= timeout - tolerance, "The CancellationTokenSource cancelled too soon ({0} sec < {1} sec).", elapsed.TotalSeconds, (timeout - tolerance).TotalSeconds);
Assert.IsTrue(elapsed <= timeout + tolerance, "The CancellationTokenSource cancelled too late ({0} sec > {1} sec).", elapsed.TotalSeconds, (timeout + tolerance).TotalSeconds);
}
}
public void TestCancelAfter_GCEligible()
{
CancellationTokenSource cts = new CancellationTokenSource();
WeakReference weakReference = new WeakReference(cts);
CancellationTokenSourceExtensions.CancelAfter(cts, TimeSpan.FromHours(1));
Assert.IsNotNull(weakReference.Target);
GC.KeepAlive(cts);
cts = null;
GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced, true);
Assert.IsNull(weakReference.Target);
}
public void TestCancelAfter_ArgumentOutOfRange()
{
CancellationTokenSourceExtensions.CancelAfter(new CancellationTokenSource(), TimeSpan.FromSeconds(-1));
}
public void TestCancelAfter_ArgumentNull()
{
CancellationTokenSourceExtensions.CancelAfter(null, TimeSpan.FromSeconds(1));
}
