public virtual void TestClear()
{
SinkQueue <int> q = new SinkQueue <int>(128);
for (int i = 0; i < q.Capacity() + 97; ++i)
{
q.Enqueue(i);
}
Assert.Equal("queue size", q.Capacity(), q.Size());
q.Clear();
Assert.Equal("queue size", 0, q.Size());
}