public void Contains()
{
var tree = new TTree <int>(2, 2);
tree.Add(10);
tree.Add(11);
tree.Add(1);
tree.Add(20);
Assert.IsTrue(tree.Contains(1), "Should contain 1");
Assert.IsTrue(tree.Contains(10), "Should contain 10");
Assert.IsTrue(tree.Contains(11), "Should contain 11");
Assert.IsTrue(tree.Contains(20), "Should contain 20");
Assert.IsFalse(tree.Contains(5), "Should not contain 5");
Assert.IsFalse(tree.Contains(3), "Should not contain 3");
Assert.IsFalse(tree.Contains(7), "Should not contain 7");
}