public void PeekDoesNotDequeueItem()
{
var queue = new LeakyQueue <int>();
queue.Enqueue(12);
queue.Enqueue(34);
Assert.AreEqual(12, queue.Peek());
Assert.AreEqual(12, queue.Peek());
}
public void QueueHeadCanBeAdvanced()
{
var queue = new LeakyQueue <int>();
queue.Enqueue(12);
queue.Enqueue(34);
Assert.AreEqual(12, queue.Peek());
queue.AdvanceHead();
Assert.AreEqual(34, queue.Peek());
}
public void PeekInEmptyQueueThrowsException()
{
var queue = new LeakyQueue <int>();
Assert.Throws <InvalidOperationException>(
delegate() { queue.Peek(); }
);
}