public void WaitAsync_Cancelled_DoesNotTakeSlot()
{
Test.Async(async () =>
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
var cts = new CancellationTokenSource();
var task = semaphore.WaitAsync(cts.Token);
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsFalse(task.IsCompleted);
cts.Cancel();
try { await task; }
catch (OperationCanceledException) { }
semaphore.Release();
Assert.AreEqual(1, semaphore.CurrentCount);
Assert.IsTrue(task.IsCanceled);
});
}
public void Release_ZeroSlots_HasNoEffect()
{
var semaphore = new AsyncSemaphore(1);
Assert.AreEqual(1, semaphore.CurrentCount);
semaphore.Release(0);
Assert.AreEqual(1, semaphore.CurrentCount);
}
public void Release_WithWaiters_ReleasesWaiters()
{
Test.Async(async () =>
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
var task = semaphore.WaitAsync();
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsFalse(task.IsCompleted);
semaphore.Release();
Assert.AreEqual(0, semaphore.CurrentCount);
await task;
});
}
public void Release_Overflow_ThrowsException()
{
var semaphore = new AsyncSemaphore(int.MaxValue);
Assert.AreEqual(int.MaxValue, semaphore.CurrentCount);
AssertEx.ThrowsException<InvalidOperationException>(() => semaphore.Release());
}
public void Release_WithoutWaiters_IncrementsCount()
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
semaphore.Release();
Assert.AreEqual(1, semaphore.CurrentCount);
var task = semaphore.WaitAsync();
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsTrue(task.IsCompleted);
}