/**
     * Create categories
     */
    private function createCategories()
    {
        $storeId = $this->storeManager->getStore('default')->getId();

        $data = [
            [
                'name' => 'Demo 1',
                'url_key' => 'demo-1',
                'position' => '10',
                'is_active' => '1',
                'parent_id' => '2',
                'store_id' => $storeId,
            ],
            [
                'name' => 'Demo 2',
                'url_key' => 'demo-2',
                'position' => '20',
                'is_active' => '1',
                'parent_id' => '2',
                'store_id' => $storeId,
            ],
            [
                'name' => 'Demo 3',
                'url_key' => 'demo-3',
                'position' => '30',
                'is_active' => '1',
                'parent_id' => '2',
                'store_id' => $storeId,
            ],
        ];

        foreach ($data as $item) {
            $category = $this->categoryFactory->create();
            $category->setData($item)->save();
            $category->setData('path', '1/2/' . $category->getId())->save();
        }
    }