public void GetMinMaxTest()
{
RedBlackTreeWithIndexAccess tree = new RedBlackTreeWithIndexAccess();
for (int i = 0; i < 1000; i++)
{
tree.RB_Insert(i);
}
int min = (int)tree.GetMinimum();
Assert.AreEqual(0, min);
int max = (int)tree.GetMaximum();
Assert.AreEqual(999, max);
}