phpOMS/tests/Stdlib/Tree/BinarySearchTreeTest.php

<?php
/**
 * Jingga
 *
 * PHP Version 8.1
 *
 * @package   tests
 * @copyright Dennis Eichhorn
 * @license   OMS License 2.0
 * @version   1.0.0
 * @link      https://jingga.app
 */
declare(strict_types=1);

namespace phpOMS\tests\Stdlib\Tree;

include_once __DIR__ . '/../../Autoloader.php';

use phpOMS\Stdlib\Tree\BinarySearchTree;
use phpOMS\Stdlib\Tree\Node;

/**
 * @testdox phpOMS\tests\Stdlib\Tree\BinarySearchTreeTest: Priority queue
 *
 * @internal
 */
final class BinarySearchTreeTest extends \PHPUnit\Framework\TestCase
{
    public function testInsert() : void
    {
        $bst = new BinarySearchTree();
        $bst->insert(new Node('D', 'D'));
        $bst->insert(new Node('I', 'I'));
        $bst->insert(new Node('N', 'N'));
        $bst->insert(new Node('O', 'O'));
        $bst->insert(new Node('S', 'S'));
        $bst->insert(new Node('A', 'A'));
        $bst->insert(new Node('U', 'U'));
        $bst->insert(new Node('R', 'R'));

        self::assertEquals(
            [
                'key' => 'D',
                0 => [
                    'key' => 'A',
                    0 => null,
                    1 => null
                ],
                1 => [
                    'key' => 'I',
                    0 => null,
                    1 => [
                        'key' => 'N',
                        0 => null,
                        1 => [
                            'key' => 'O',
                            0 => null,
                            1 => [
                                'key' => 'S',
                                0 => [
                                    'key' => 'R',
                                    0 => null,
                                    1 => null
                                ],
                                1 => [
                                    'key' => 'U',
                                    0 => null,
                                    1 => null
                                ],
                            ],
                        ],
                    ],
                ],
            ],
            $bst->toArray()
        );
    }

    public function testSearch() : void
    {
        $bst = new BinarySearchTree();
        $bst->insert(new Node('D', 'D'));
        $bst->insert(new Node('I', 'I'));
        $bst->insert(new Node('N', 'N'));
        $bst->insert(new Node('O', 'O'));
        $bst->insert(new Node('S', 'S'));
        $bst->insert(new Node('A', 'A'));
        $bst->insert(new Node('U', 'U'));
        $bst->insert(new Node('R', 'R'));

        self::assertEquals('S', $bst->search('S')->key);
        self::assertEquals('U', $bst->search('U')->key);
        self::assertEquals('R', $bst->search('R')->key);
    }

    public function testDelete() : void
    {
        $bst = new BinarySearchTree();
        $bst->insert(new Node('D', 'D'));
        $bst->insert(new Node('I', 'I'));
        $bst->insert(new Node('N', 'N'));
        $bst->insert(new Node('O', 'O'));
        $bst->insert(new Node('S', 'S'));
        $bst->insert(new Node('A', 'A'));
        $bst->insert(new Node('U', 'U'));
        $bst->insert(new Node('R', 'R'));
        $bst->delete($bst->search('I'));
        $bst->insert(new Node('Z', 'Z'));
        $bst->delete($bst->search('S'));
        $bst->insert(new Node('T', 'T'));

        self::assertEquals(
            [
                'key' => 'D',
                0 => [
                    'key' => 'A',
                    0 => null,
                    1 => null
                ],
                1 => [
                    'key' => 'N',
                    0 => null,
                    1 => [
                        'key' => 'O',
                        0 => null,
                        1 => [
                            'key' => 'U',
                            0 => [
                                'key' => 'R',
                                0 => null,
                                1 => [
                                    'key' => 'T',
                                    0 => null,
                                    1 => null
                                ]
                            ],
                            1 => [
                                'key' => 'Z',
                                0 => null,
                                1 => null
                            ],
                        ],
                    ],
                ],
            ],
            $bst->toArray()
        );
    }
}