private void VerifyBalancedTree(IBalancedTreeVerifier <int> balancedTreeVerifier)
        {
            BinaryTreeNode <int> root = BuildBalancedBinaryTree();
            bool result = balancedTreeVerifier.IsBalanced(root);

            Assert.AreEqual(true, result);
        }
 private void RunTests(IBalancedTreeVerifier <int> balancedTreeVerifier)
 {
     VerifyUnbalancedTree(balancedTreeVerifier);
     VerifyBalancedTree(balancedTreeVerifier);
 }