<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

declare(strict_types=1);

use Magento\Catalog\Api\ProductAttributeRepositoryInterface;
use Magento\Catalog\Model\Product;
use Magento\Catalog\Model\ResourceModel\Eav\AttributeFactory;
use Magento\Eav\Setup\EavSetup;
use Magento\TestFramework\Helper\Bootstrap;

$objectManager = Bootstrap::getObjectManager();
/** @var AttributeFactory $attributeFactory */
$attributeFactory = $objectManager->get(AttributeFactory::class);
/** @var ProductAttributeRepositoryInterface $productAttributeRepository */
$productAttributeRepository = $objectManager->get(ProductAttributeRepositoryInterface::class);
$attribute = $attributeFactory->create()->loadByCode(Product::ENTITY, 'test_searchable_attribute');
if (!$attribute->getId()) {
    /** @var EavSetup $installer */
    $installer = $objectManager->create(EavSetup::class);
    $attribute->setData(
        [
            'attribute_code' => 'test_searchable_attribute',
            'is_global' => 0,
            'is_user_defined' => 1,
            'frontend_input' => 'select',
            'is_unique' => 0,
            'is_required' => 0,
            'is_searchable' => 1,
            'is_visible_in_advanced_search' => 1,
            'is_comparable' => 0,
            'is_filterable' => 1,
            'is_filterable_in_search' => 1,
            'is_used_for_promo_rules' => 0,
            'is_html_allowed_on_front' => 1,
            'is_visible_on_front' => 0,
            'used_in_product_listing' => 0,
            'used_for_sort_by' => 0,
            'frontend_label' => ['Test Drop-Down Attribute'],
            'backend_type' => 'int',
            'option' => [
                'value' => [
                    'option_1' => ['Option 1'],
                    'option_2' => ['Option 2'],
                    'option_3' => ['Option 3'],
                    'option_4' => ['xbox']
                ],
                'order' => [
                    'option_1' => 1,
                    'option_2' => 2,
                    'option_3' => 3,
                    'option_4' => 4,
                ],
            ],
        ]
    );
    $productAttributeRepository->save($attribute);
    $attribute = $productAttributeRepository->get('test_searchable_attribute');
    /* Assign attribute to attribute set */
    $installer->addAttributeToGroup(Product::ENTITY, 'Default', 'Attributes', $attribute->getId());
}