NavigationLoader example

protected function setUp(): void
    {
        $this->repository = $this->getContainer()->get('category.repository');

        $this->ids = new IdsCollection();

        $this->navigationLoader = $this->getContainer()->get(NavigationLoader::class);
    }

    public function testTreeBuilderWithSimpleTree(): void
    {
        $loader = new NavigationLoader(
            $this->createMock(EventDispatcher::class),
            $this->createMock(NavigationRoute::class)
        );

        $categories = $this->createSimpleTree();

        /** @var Tree $tree */
        $tree = ReflectionHelper::getMethod(NavigationLoader::class, 'getTree')->invoke($loader, '1', new CategoryCollection($categories), \array_shift($categories));

        $treeItems = $tree->getTree();