public void BinarySearchTreeAddTest()
{
for (int i = 0; i < 10; i++)
{
for (int j = 0; j < 100; j++)
{
int[] data = ArrayUtilities.CreateRandomArray(j, 0, BinarySearchTreeTests.MaxValue);
BinaryTreeNode <int> root = null;
for (int k = 0; k < data.Length; k++)
{
if (k == 0)
{
root = new BinaryTreeNode <int>(data[k]);
}
else
{
BinarySearchTree.Insert(root, data[k]);
}
BinarySearchTreeTests.ValidateTree(root, data, k + 1);
}
}
}
}
private static void ValidateNode(BinaryTreeNode <int> node, int min = int.MinValue, int max = int.MaxValue)
{
if (node == null)
{
return;
}
Assert.IsTrue(node.Data >= min);
Assert.IsTrue(node.Data <= max);
BinarySearchTreeTests.ValidateNode(node.Left, min, node.Data);
BinarySearchTreeTests.ValidateNode(node.Right, node.Data, max);
}
public void BinarySearchTreeDeleteTest()
{
for (int i = 0; i < 10; i++)
{
for (int j = 1; j < 100; j++)
{
int[] data = Utilities.ArrayUtilities.CreateRandomArray(j, 0, BinarySearchTreeTests.MaxValue);
BinaryTreeNode <int> root = new BinaryTreeNode <int>(data[0]);
for (int k = 1; k < data.Length; k++)
{
BinarySearchTree.Insert(root, data[k]);
}
BinarySearchTreeTests.ValidateTree(root, data, data.Length);
List <int> list = new List <int>(data);
Random random = new Random();
while (list.Count > 0)
{
int index = random.Next(0, list.Count);
int x = list[index];
BinaryTreeNode <int> toRemove = BinarySearchTree.Find(root, x);
BinaryTreeNode <int> successor = BinaryTree.Delete(toRemove);
if (toRemove == root)
{
root = successor;
}
list.RemoveAt(index);
int[] remaining = list.ToArray();
ValidateTree(root, remaining, remaining.Length);
}
}
}
}
private static void ValidateTree(BinaryTreeNode <int> root, int[] data, int count)
{
BinarySearchTreeTests.ValidateNode(root);
int[] sorted = new int[count];
Array.Copy(data, sorted, count);
Array.Sort(sorted);
foreach (int x in sorted)
{
Assert.IsNotNull(BinarySearchTree.Find(root, x));
}
int l = 0;
foreach (BinaryTreeNode <int> x in BinaryTree.InOrderTraversal(root))
{
Assert.AreEqual(x.Data, sorted[l]);
l++;
}
Assert.AreEqual(l, count);
}