public void EnumeratorTest()
{
int count = 100;
IEnumerable <int> items = Enumerable.Range(0, count);
IPersistentQueue <int> queue = PersistentQueue <int> .Empty;
foreach (int item in items)
{
queue = queue.Enqueue(item);
}
foreach (IEnumerator enumerator in
new IEnumerator[] { queue.GetEnumerator(), ((IEnumerable)queue).GetEnumerator() })
{
foreach (int item in items)
{
Assert.True(enumerator.MoveNext());
Assert.Equal(item, enumerator.Current);
}
Assert.False(enumerator.MoveNext());
}
}
private static void CheckEmptyBehaviour <T>(IPersistentQueue <T> queue)
{
Assert.Equal(0, queue.Count);
Assert.False(queue.GetEnumerator().MoveNext());
Assert.Throws <InvalidOperationException>(() => queue.Dequeue());
}