public void InvokeWithCallback()
{
// Arrange
ObjectAsyncResult <int> oar = new ObjectAsyncResult <int>(42);
SignalContainer <IAsyncResult> callbackContainer = new SignalContainer <IAsyncResult>();
AsyncCallback callback = ar => {
callbackContainer.Signal(ar);
};
// Act
IAsyncResult asyncResult = oar.BeginInvoke(callback, "some state");
IAsyncResult passedToCallback = callbackContainer.Wait();
int returned = oar.EndInvoke(asyncResult);
// Assert
Assert.AreEqual(asyncResult, passedToCallback);
Assert.AreEqual("some state", asyncResult.AsyncState);
Assert.AreEqual(42, returned);
}