public void CopyToArrayTest()
{
var tree = new AvlTree <int>();
var src = new int[100];
for (int i = 0; i < src.Length; i++)
{
src[i] = i + 1;
tree.Add(i + 1);
}
var dest = new int[100];
tree.CopyTo(dest, 0);
Assert.Equal(src, dest);
}