WP-LIT-MCP/tests/Unit/Integrations/WordPress/Menus/MenuTreeTest.php

<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\WordPress\Menus;

use LIT\MCP\Integrations\WordPress\Menus\MenuTree;
use LIT\MCP\Tests\Unit\TestCase;

final class MenuTreeTest extends TestCase
{
    use MenuFixtures;

    public function testBuildsANestedTreeInMenuOrder(): void
    {
        $tree = MenuTree::build([
            self::item(10, 0, 'Start'),
            self::item(11, 0, 'Über uns'),
            self::item(12, 11, 'Team'),
            self::item(13, 0, 'Kontakt', 'custom', '/kontakt'),
        ]);

        self::assertSame(['Start', 'Über uns', 'Kontakt'], array_column($tree, 'title'));
        self::assertSame('Team', $tree[1]['children'][0]['title']);
        self::assertSame([], $tree[1]['children'][0]['children']);
        self::assertSame('custom', $tree[2]['type']);
        self::assertSame('post', $tree[0]['type']);
        self::assertSame(110, $tree[0]['object_id']);
    }

    public function testOrphansAndSelfParentsLandOnTheTopLevel(): void
    {
        $tree = MenuTree::build([self::item(20, 99, 'Waise'), self::item(21, 21, 'Zirkel')]);

        self::assertSame(['Waise', 'Zirkel'], array_column($tree, 'title'));
    }

    public function testParentNotPresentInTheMenuLandsOnTheTopLevel(): void
    {
        $tree = MenuTree::build([self::item(40, 12345, 'Verwaist')]);

        self::assertSame(['Verwaist'], array_column($tree, 'title'));
        self::assertSame([], $tree[0]['children']);
    }

    public function testATwoNodeParentCycleKeepsBothItemsOnTheTopLevel(): void
    {
        $tree = MenuTree::build([self::item(30, 31, 'A'), self::item(31, 30, 'B')]);

        self::assertSame(['A', 'B'], array_column($tree, 'title'));
        self::assertSame([], $tree[0]['children']);
        self::assertSame([], $tree[1]['children']);
    }
}