public void DeleteTest()
{
//Arrange
var bst = new BinarySearchTree<int, string>();
bst.Add(5, "A");
bst.Add(3, "B");
bst.Add(6, "C");
bst.Add(2, "D");
bst.Add(7, "E");
bst.Add(4, "F");
//Act
bst.Delete(3);
var testResult = bst.GetNodeByKey(5).LeftNode;
//Assert
Assert.AreEqual(testResult.Key, 4);
}
public static void Delete(BinarySearchTreeNode node)
{
BinarySearchTree.Delete(node);
Rebalance(node);
}
public void LevelOrderTraversalAfterRemovingTest()
{
//Arrange
var bst = new BinarySearchTree<int, string>();
//88 48 91 26 55 11 43 65 12 57 23 62
var testData = new[]
{
new KeyValuePair<int, string>(88, "88"),
new KeyValuePair<int, string>(48, "48"),
new KeyValuePair<int, string>(91, "91"),
new KeyValuePair<int, string>(26, "26"),
new KeyValuePair<int, string>(55, "55"),
new KeyValuePair<int, string>(11, "11"),
new KeyValuePair<int, string>(43, "43"),
new KeyValuePair<int, string>(65, "65"),
new KeyValuePair<int, string>(12, "12"),
new KeyValuePair<int, string>(57, "57"),
new KeyValuePair<int, string>(23, "23"),
new KeyValuePair<int, string>(62, "62"),
};
//Act
testData.All(t =>
{
bst.Add(t.Key, t.Value);
return true;
});
var result = bst.LevelOrderTraversal();
//Assert
Assert.AreEqual(result.Count(), 12);
Assert.AreEqual(result.ElementAt(0).Key, 88);
Assert.AreEqual(result.ElementAt(1).Key, 48);
Assert.AreEqual(result.ElementAt(2).Key, 91);
Assert.AreEqual(result.ElementAt(3).Key, 26);
Assert.AreEqual(result.ElementAt(4).Key, 55);
Assert.AreEqual(result.ElementAt(5).Key, 11);
Assert.AreEqual(result.ElementAt(6).Key, 43);
Assert.AreEqual(result.ElementAt(7).Key, 65);
Assert.AreEqual(result.ElementAt(8).Key, 12);
Assert.AreEqual(result.ElementAt(9).Key, 57);
Assert.AreEqual(result.ElementAt(10).Key, 23);
Assert.AreEqual(result.ElementAt(11).Key, 62);
//91 12 48
bst.Delete(91);
bst.Delete(12);
bst.Delete(48);
result = bst.LevelOrderTraversal();
//Assert
Assert.AreEqual(result.Count(), 9);
Assert.AreEqual(result.ElementAt(0).Key, 88);
Assert.AreEqual(result.ElementAt(1).Key, 55);
Assert.AreEqual(result.ElementAt(2).Key, 26);
Assert.AreEqual(result.ElementAt(3).Key, 65);
Assert.AreEqual(result.ElementAt(4).Key, 11);
Assert.AreEqual(result.ElementAt(5).Key, 43);
Assert.AreEqual(result.ElementAt(6).Key, 57);
Assert.AreEqual(result.ElementAt(7).Key, 23);
Assert.AreEqual(result.ElementAt(8).Key, 62);
}
private static BinarySearchTreeNode Delete(BinarySearchTreeNode node)
{
Splay(BinarySearchTree.Next(node));
Splay(node);
return(BinarySearchTree.Delete(node));
}