public void Replace4a()
{
IPriorityQueueHandle<int> handle1 = null;
queue.Add(ref handle1, 4);
Assert.AreEqual(4, queue.FindMin());
queue.Add(3);
Assert.AreEqual(3, queue.FindMin());
Assert.AreEqual(4, queue.Replace(handle1, 2));
Assert.AreEqual(2, queue.FindMin());
}