public void Clear()
{
var tree = new TTree <int>(2, 2);
tree.Add(10);
tree.Add(11);
tree.Add(1);
tree.Add(20);
tree.Clear();
Assert.AreEqual(0, tree.Count, "Invalid count");
Assert.AreEqual(0, tree.Count, "Invalid item count");
Assert.AreEqual(0, tree.Height, "Invalid height");
}