public void delete_root_without_children()
{
Tree tree = new Tree(10);
tree.Delete(10);
Assert.Null(tree.Root);
}
public void delete_nodes_which_have_two_children_nodes()
{
Tree tree = new Tree(100);
tree.Insert(50);
tree.Insert(150);
tree.Insert(25);
tree.Insert(75);
tree.Insert(125);
tree.Insert(60);
tree.Insert(80);
tree.Insert(200);
tree.Delete(50);
tree.Delete(150);
Assert.Equal(200, tree.Root.Right.Data);
Assert.Equal(60, tree.Root.Left.Data);
}
public void delete_root_with_one_child()
{
Tree tree = new Tree(10);
tree.Insert(15);
tree.Delete(10);
Assert.Equal(15, tree.Root.Data);
Assert.Null(tree.Root.Left);
Assert.Null(tree.Root.Right);
}
public void delete_leaf_node_on_first_level()
{
Tree tree = new Tree(10);
tree.Insert(5);
tree.Insert(15);
tree.Delete(5);
Assert.Null(tree.Root.Left);
Assert.NotNull(tree.Root.Right);
}
public void throws_exception_when_delete_not_existing_node()
{
Tree tree = new Tree(10);
Assert.Throws <InvalidOperationException>(() => tree.Delete(100));
}
