public void CancelDelayedTest()
{
// prepare
var syncContext = new SynchronizationContext();
var anotherSyncContext = new SynchronizationContext();
var stopWatch = new Stopwatch().Also((it) => it.Start());
// cancel before execution
var executed = false;
var token = syncContext.PostDelayed(() =>
{
executed = true;
}, 500);
Thread.Sleep(200);
Assert.IsTrue(syncContext.CancelDelayed(token), "Call-back cancellation should be successful.");
Thread.Sleep(500);
Assert.IsFalse(executed, "Call-back should not be executed after cancellation.");
Assert.IsFalse(syncContext.CancelDelayed(token), "Call-back cancellation should be failed.");
// cancel after execution
executed = false;
token = syncContext.PostDelayed(() =>
{
executed = true;
}, 200);
Thread.Sleep(500);
Assert.IsTrue(executed, "Call-back should be executed.");
Assert.IsFalse(syncContext.CancelDelayed(token), "Call-back cancellation should be failed after execution.");
// cancel by another synchronization context
executed = false;
token = syncContext.PostDelayed(() =>
{
executed = true;
}, 200);
Assert.IsFalse(anotherSyncContext.CancelDelayed(token), "Call-back cancellation should be failed by another synchronization context.");
Thread.Sleep(500);
Assert.IsTrue(executed, "Call-back should be executed.");
}